/*
 * linux/drivers/video/omap2/dss/dsi.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define DSS_SUBSYS_NAME "DSI"

#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/semaphore.h>
#include <linux/seq_file.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/component.h>

#include <video/omapfb_dss.h>
#include <video/mipi_display.h>

#include "dss.h"
#include "dss_features.h"

#define DSI_CATCH_MISSING_TE

struct dsi_reg { u16 module; u16 idx; };

#define DSI_REG(mod, idx)               ((const struct dsi_reg) { mod, idx })

/* DSI Protocol Engine */

#define DSI_PROTO                       0
#define DSI_PROTO_SZ                    0x200

#define DSI_REVISION                    DSI_REG(DSI_PROTO, 0x0000)
#define DSI_SYSCONFIG                   DSI_REG(DSI_PROTO, 0x0010)
#define DSI_SYSSTATUS                   DSI_REG(DSI_PROTO, 0x0014)
#define DSI_IRQSTATUS                   DSI_REG(DSI_PROTO, 0x0018)
#define DSI_IRQENABLE                   DSI_REG(DSI_PROTO, 0x001C)
#define DSI_CTRL                        DSI_REG(DSI_PROTO, 0x0040)
#define DSI_GNQ                         DSI_REG(DSI_PROTO, 0x0044)
#define DSI_COMPLEXIO_CFG1              DSI_REG(DSI_PROTO, 0x0048)
#define DSI_COMPLEXIO_IRQ_STATUS        DSI_REG(DSI_PROTO, 0x004C)
#define DSI_COMPLEXIO_IRQ_ENABLE        DSI_REG(DSI_PROTO, 0x0050)
#define DSI_CLK_CTRL                    DSI_REG(DSI_PROTO, 0x0054)
#define DSI_TIMING1                     DSI_REG(DSI_PROTO, 0x0058)
#define DSI_TIMING2                     DSI_REG(DSI_PROTO, 0x005C)
#define DSI_VM_TIMING1                  DSI_REG(DSI_PROTO, 0x0060)
#define DSI_VM_TIMING2                  DSI_REG(DSI_PROTO, 0x0064)
#define DSI_VM_TIMING3                  DSI_REG(DSI_PROTO, 0x0068)
#define DSI_CLK_TIMING                  DSI_REG(DSI_PROTO, 0x006C)
#define DSI_TX_FIFO_VC_SIZE             DSI_REG(DSI_PROTO, 0x0070)
#define DSI_RX_FIFO_VC_SIZE             DSI_REG(DSI_PROTO, 0x0074)
#define DSI_COMPLEXIO_CFG2              DSI_REG(DSI_PROTO, 0x0078)
#define DSI_RX_FIFO_VC_FULLNESS         DSI_REG(DSI_PROTO, 0x007C)
#define DSI_VM_TIMING4                  DSI_REG(DSI_PROTO, 0x0080)
#define DSI_TX_FIFO_VC_EMPTINESS        DSI_REG(DSI_PROTO, 0x0084)
#define DSI_VM_TIMING5                  DSI_REG(DSI_PROTO, 0x0088)
#define DSI_VM_TIMING6                  DSI_REG(DSI_PROTO, 0x008C)
#define DSI_VM_TIMING7                  DSI_REG(DSI_PROTO, 0x0090)
#define DSI_STOPCLK_TIMING              DSI_REG(DSI_PROTO, 0x0094)
#define DSI_VC_CTRL(n)                  DSI_REG(DSI_PROTO, 0x0100 + (n * 0x20))
#define DSI_VC_TE(n)                    DSI_REG(DSI_PROTO, 0x0104 + (n * 0x20))
#define DSI_VC_LONG_PACKET_HEADER(n)    DSI_REG(DSI_PROTO, 0x0108 + (n * 0x20))
#define DSI_VC_LONG_PACKET_PAYLOAD(n)   DSI_REG(DSI_PROTO, 0x010C + (n * 0x20))
#define DSI_VC_SHORT_PACKET_HEADER(n)   DSI_REG(DSI_PROTO, 0x0110 + (n * 0x20))
#define DSI_VC_IRQSTATUS(n)             DSI_REG(DSI_PROTO, 0x0118 + (n * 0x20))
#define DSI_VC_IRQENABLE(n)             DSI_REG(DSI_PROTO, 0x011C + (n * 0x20))

/* DSIPHY_SCP */

#define DSI_PHY                         1
#define DSI_PHY_OFFSET                  0x200
#define DSI_PHY_SZ                      0x40

#define DSI_DSIPHY_CFG0                 DSI_REG(DSI_PHY, 0x0000)
#define DSI_DSIPHY_CFG1                 DSI_REG(DSI_PHY, 0x0004)
#define DSI_DSIPHY_CFG2                 DSI_REG(DSI_PHY, 0x0008)
#define DSI_DSIPHY_CFG5                 DSI_REG(DSI_PHY, 0x0014)
#define DSI_DSIPHY_CFG10                DSI_REG(DSI_PHY, 0x0028)

/* DSI_PLL_CTRL_SCP */

#define DSI_PLL                         2
#define DSI_PLL_OFFSET                  0x300
#define DSI_PLL_SZ                      0x20

#define DSI_PLL_CONTROL                 DSI_REG(DSI_PLL, 0x0000)
#define DSI_PLL_STATUS                  DSI_REG(DSI_PLL, 0x0004)
#define DSI_PLL_GO                      DSI_REG(DSI_PLL, 0x0008)
#define DSI_PLL_CONFIGURATION1          DSI_REG(DSI_PLL, 0x000C)
#define DSI_PLL_CONFIGURATION2          DSI_REG(DSI_PLL, 0x0010)

#define REG_GET(dsidev, idx, start, end) \
        FLD_GET(dsi_read_reg(dsidev, idx), start, end)

#define REG_FLD_MOD(dsidev, idx, val, start, end) \
        dsi_write_reg(dsidev, idx, FLD_MOD(dsi_read_reg(dsidev, idx), val, start, end))

/* Global interrupts */
#define DSI_IRQ_VC0             (1 << 0)
#define DSI_IRQ_VC1             (1 << 1)
#define DSI_IRQ_VC2             (1 << 2)
#define DSI_IRQ_VC3             (1 << 3)
#define DSI_IRQ_WAKEUP          (1 << 4)
#define DSI_IRQ_RESYNC          (1 << 5)
#define DSI_IRQ_PLL_LOCK        (1 << 7)
#define DSI_IRQ_PLL_UNLOCK      (1 << 8)
#define DSI_IRQ_PLL_RECALL      (1 << 9)
#define DSI_IRQ_COMPLEXIO_ERR   (1 << 10)
#define DSI_IRQ_HS_TX_TIMEOUT   (1 << 14)
#define DSI_IRQ_LP_RX_TIMEOUT   (1 << 15)
#define DSI_IRQ_TE_TRIGGER      (1 << 16)
#define DSI_IRQ_ACK_TRIGGER     (1 << 17)
#define DSI_IRQ_SYNC_LOST       (1 << 18)
#define DSI_IRQ_LDO_POWER_GOOD  (1 << 19)
#define DSI_IRQ_TA_TIMEOUT      (1 << 20)
#define DSI_IRQ_ERROR_MASK \
        (DSI_IRQ_HS_TX_TIMEOUT | DSI_IRQ_LP_RX_TIMEOUT | DSI_IRQ_SYNC_LOST | \
        DSI_IRQ_TA_TIMEOUT)
#define DSI_IRQ_CHANNEL_MASK    0xf

/* Virtual channel interrupts */
#define DSI_VC_IRQ_CS           (1 << 0)
#define DSI_VC_IRQ_ECC_CORR     (1 << 1)
#define DSI_VC_IRQ_PACKET_SENT  (1 << 2)
#define DSI_VC_IRQ_FIFO_TX_OVF  (1 << 3)
#define DSI_VC_IRQ_FIFO_RX_OVF  (1 << 4)
#define DSI_VC_IRQ_BTA          (1 << 5)
#define DSI_VC_IRQ_ECC_NO_CORR  (1 << 6)
#define DSI_VC_IRQ_FIFO_TX_UDF  (1 << 7)
#define DSI_VC_IRQ_PP_BUSY_CHANGE (1 << 8)
#define DSI_VC_IRQ_ERROR_MASK \
        (DSI_VC_IRQ_CS | DSI_VC_IRQ_ECC_CORR | DSI_VC_IRQ_FIFO_TX_OVF | \
        DSI_VC_IRQ_FIFO_RX_OVF | DSI_VC_IRQ_ECC_NO_CORR | \
        DSI_VC_IRQ_FIFO_TX_UDF)

/* ComplexIO interrupts */
#define DSI_CIO_IRQ_ERRSYNCESC1         (1 << 0)
#define DSI_CIO_IRQ_ERRSYNCESC2         (1 << 1)
#define DSI_CIO_IRQ_ERRSYNCESC3         (1 << 2)
#define DSI_CIO_IRQ_ERRSYNCESC4         (1 << 3)
#define DSI_CIO_IRQ_ERRSYNCESC5         (1 << 4)
#define DSI_CIO_IRQ_ERRESC1             (1 << 5)
#define DSI_CIO_IRQ_ERRESC2             (1 << 6)
#define DSI_CIO_IRQ_ERRESC3             (1 << 7)
#define DSI_CIO_IRQ_ERRESC4             (1 << 8)
#define DSI_CIO_IRQ_ERRESC5             (1 << 9)
#define DSI_CIO_IRQ_ERRCONTROL1         (1 << 10)
#define DSI_CIO_IRQ_ERRCONTROL2         (1 << 11)
#define DSI_CIO_IRQ_ERRCONTROL3         (1 << 12)
#define DSI_CIO_IRQ_ERRCONTROL4         (1 << 13)
#define DSI_CIO_IRQ_ERRCONTROL5         (1 << 14)
#define DSI_CIO_IRQ_STATEULPS1          (1 << 15)
#define DSI_CIO_IRQ_STATEULPS2          (1 << 16)
#define DSI_CIO_IRQ_STATEULPS3          (1 << 17)
#define DSI_CIO_IRQ_STATEULPS4          (1 << 18)
#define DSI_CIO_IRQ_STATEULPS5          (1 << 19)
#define DSI_CIO_IRQ_ERRCONTENTIONLP0_1  (1 << 20)
#define DSI_CIO_IRQ_ERRCONTENTIONLP1_1  (1 << 21)
#define DSI_CIO_IRQ_ERRCONTENTIONLP0_2  (1 << 22)
#define DSI_CIO_IRQ_ERRCONTENTIONLP1_2  (1 << 23)
#define DSI_CIO_IRQ_ERRCONTENTIONLP0_3  (1 << 24)
#define DSI_CIO_IRQ_ERRCONTENTIONLP1_3  (1 << 25)
#define DSI_CIO_IRQ_ERRCONTENTIONLP0_4  (1 << 26)
#define DSI_CIO_IRQ_ERRCONTENTIONLP1_4  (1 << 27)
#define DSI_CIO_IRQ_ERRCONTENTIONLP0_5  (1 << 28)
#define DSI_CIO_IRQ_ERRCONTENTIONLP1_5  (1 << 29)
#define DSI_CIO_IRQ_ULPSACTIVENOT_ALL0  (1 << 30)
#define DSI_CIO_IRQ_ULPSACTIVENOT_ALL1  (1 << 31)
#define DSI_CIO_IRQ_ERROR_MASK \
        (DSI_CIO_IRQ_ERRSYNCESC1 | DSI_CIO_IRQ_ERRSYNCESC2 | \
         DSI_CIO_IRQ_ERRSYNCESC3 | DSI_CIO_IRQ_ERRSYNCESC4 | \
         DSI_CIO_IRQ_ERRSYNCESC5 | \
         DSI_CIO_IRQ_ERRESC1 | DSI_CIO_IRQ_ERRESC2 | \
         DSI_CIO_IRQ_ERRESC3 | DSI_CIO_IRQ_ERRESC4 | \
         DSI_CIO_IRQ_ERRESC5 | \
         DSI_CIO_IRQ_ERRCONTROL1 | DSI_CIO_IRQ_ERRCONTROL2 | \
         DSI_CIO_IRQ_ERRCONTROL3 | DSI_CIO_IRQ_ERRCONTROL4 | \
         DSI_CIO_IRQ_ERRCONTROL5 | \
         DSI_CIO_IRQ_ERRCONTENTIONLP0_1 | DSI_CIO_IRQ_ERRCONTENTIONLP1_1 | \
         DSI_CIO_IRQ_ERRCONTENTIONLP0_2 | DSI_CIO_IRQ_ERRCONTENTIONLP1_2 | \
         DSI_CIO_IRQ_ERRCONTENTIONLP0_3 | DSI_CIO_IRQ_ERRCONTENTIONLP1_3 | \
         DSI_CIO_IRQ_ERRCONTENTIONLP0_4 | DSI_CIO_IRQ_ERRCONTENTIONLP1_4 | \
         DSI_CIO_IRQ_ERRCONTENTIONLP0_5 | DSI_CIO_IRQ_ERRCONTENTIONLP1_5)

typedef void (*omap_dsi_isr_t) (void *arg, u32 mask);

static int dsi_display_init_dispc(struct platform_device *dsidev,
        struct omap_overlay_manager *mgr);
static void dsi_display_uninit_dispc(struct platform_device *dsidev,
        struct omap_overlay_manager *mgr);

static int dsi_vc_send_null(struct omap_dss_device *dssdev, int channel);

/* DSI PLL HSDIV indices */
#define HSDIV_DISPC     0
#define HSDIV_DSI       1

#define DSI_MAX_NR_ISRS                2
#define DSI_MAX_NR_LANES        5

enum dsi_lane_function {
        DSI_LANE_UNUSED = 0,
        DSI_LANE_CLK,
        DSI_LANE_DATA1,
        DSI_LANE_DATA2,
        DSI_LANE_DATA3,
        DSI_LANE_DATA4,
};

struct dsi_lane_config {
        enum dsi_lane_function function;
        u8 polarity;
};

struct dsi_isr_data {
        omap_dsi_isr_t  isr;
        void            *arg;
        u32             mask;
};

enum fifo_size {
        DSI_FIFO_SIZE_0         = 0,
        DSI_FIFO_SIZE_32        = 1,
        DSI_FIFO_SIZE_64        = 2,
        DSI_FIFO_SIZE_96        = 3,
        DSI_FIFO_SIZE_128       = 4,
};

enum dsi_vc_source {
        DSI_VC_SOURCE_L4 = 0,
        DSI_VC_SOURCE_VP,
};

struct dsi_irq_stats {
        unsigned long last_reset;
        unsigned irq_count;
        unsigned dsi_irqs[32];
        unsigned vc_irqs[4][32];
        unsigned cio_irqs[32];
};

struct dsi_isr_tables {
        struct dsi_isr_data isr_table[DSI_MAX_NR_ISRS];
        struct dsi_isr_data isr_table_vc[4][DSI_MAX_NR_ISRS];
        struct dsi_isr_data isr_table_cio[DSI_MAX_NR_ISRS];
};

struct dsi_clk_calc_ctx {
        struct platform_device *dsidev;
        struct dss_pll *pll;

        /* inputs */

        const struct omap_dss_dsi_config *config;

        unsigned long req_pck_min, req_pck_nom, req_pck_max;

        /* outputs */

        struct dss_pll_clock_info dsi_cinfo;
        struct dispc_clock_info dispc_cinfo;

        struct omap_video_timings dispc_vm;
        struct omap_dss_dsi_videomode_timings dsi_vm;
};

struct dsi_lp_clock_info {
        unsigned long lp_clk;
        u16 lp_clk_div;
};

struct dsi_data {
        struct platform_device *pdev;
        void __iomem *proto_base;
        void __iomem *phy_base;
        void __iomem *pll_base;

        int module_id;

        int irq;

        bool is_enabled;

        struct clk *dss_clk;

        struct dispc_clock_info user_dispc_cinfo;
        struct dss_pll_clock_info user_dsi_cinfo;

        struct dsi_lp_clock_info user_lp_cinfo;
        struct dsi_lp_clock_info current_lp_cinfo;

        struct dss_pll pll;

        bool vdds_dsi_enabled;
        struct regulator *vdds_dsi_reg;

        struct {
                enum dsi_vc_source source;
                struct omap_dss_device *dssdev;
                enum fifo_size tx_fifo_size;
                enum fifo_size rx_fifo_size;
                int vc_id;
        } vc[4];

        struct mutex lock;
        struct semaphore bus_lock;

        spinlock_t irq_lock;
        struct dsi_isr_tables isr_tables;
        /* space for a copy used by the interrupt handler */
        struct dsi_isr_tables isr_tables_copy;

        int update_channel;
#ifdef DSI_PERF_MEASURE
        unsigned update_bytes;
#endif

        bool te_enabled;
        bool ulps_enabled;

        void (*framedone_callback)(int, void *);
        void *framedone_data;

        struct delayed_work framedone_timeout_work;

#ifdef DSI_CATCH_MISSING_TE
        struct timer_list te_timer;
#endif

        unsigned long cache_req_pck;
        unsigned long cache_clk_freq;
        struct dss_pll_clock_info cache_cinfo;

        u32             errors;
        spinlock_t      errors_lock;
#ifdef DSI_PERF_MEASURE
        ktime_t perf_setup_time;
        ktime_t perf_start_time;
#endif
        int debug_read;
        int debug_write;

#ifdef CONFIG_FB_OMAP2_DSS_COLLECT_IRQ_STATS
        spinlock_t irq_stats_lock;
        struct dsi_irq_stats irq_stats;
#endif

        unsigned num_lanes_supported;
        unsigned line_buffer_size;

        struct dsi_lane_config lanes[DSI_MAX_NR_LANES];
        unsigned num_lanes_used;

        unsigned scp_clk_refcount;

        struct dss_lcd_mgr_config mgr_config;
        struct omap_video_timings timings;
        enum omap_dss_dsi_pixel_format pix_fmt;
        enum omap_dss_dsi_mode mode;
        struct omap_dss_dsi_videomode_timings vm_timings;

        struct omap_dss_device output;
};

struct dsi_packet_sent_handler_data {
        struct platform_device *dsidev;
        struct completion *completion;
};

struct dsi_module_id_data {
        u32 address;
        int id;
};

static const struct of_device_id dsi_of_match[];

#ifdef DSI_PERF_MEASURE
static bool dsi_perf;
module_param(dsi_perf, bool, 0644);
#endif

static inline struct dsi_data *dsi_get_dsidrv_data(struct platform_device *dsidev)
{
        return dev_get_drvdata(&dsidev->dev);
}

static inline struct platform_device *dsi_get_dsidev_from_dssdev(struct omap_dss_device *dssdev)
{
        return to_platform_device(dssdev->dev);
}

static struct platform_device *dsi_get_dsidev_from_id(int module)
{
        struct omap_dss_device *out;
        enum omap_dss_output_id id;

        switch (module) {
        case 0:
                id = OMAP_DSS_OUTPUT_DSI1;
                break;
        case 1:
                id = OMAP_DSS_OUTPUT_DSI2;
                break;
        default:
                return NULL;
        }

        out = omap_dss_get_output(id);

        return out ? to_platform_device(out->dev) : NULL;
}

static inline void dsi_write_reg(struct platform_device *dsidev,
                const struct dsi_reg idx, u32 val)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        void __iomem *base;

        switch(idx.module) {
                case DSI_PROTO: base = dsi->proto_base; break;
                case DSI_PHY: base = dsi->phy_base; break;
                case DSI_PLL: base = dsi->pll_base; break;
                default: return;
        }

        __raw_writel(val, base + idx.idx);
}

static inline u32 dsi_read_reg(struct platform_device *dsidev,
                const struct dsi_reg idx)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        void __iomem *base;

        switch(idx.module) {
                case DSI_PROTO: base = dsi->proto_base; break;
                case DSI_PHY: base = dsi->phy_base; break;
                case DSI_PLL: base = dsi->pll_base; break;
                default: return 0;
        }

        return __raw_readl(base + idx.idx);
}

static void dsi_bus_lock(struct omap_dss_device *dssdev)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        down(&dsi->bus_lock);
}

static void dsi_bus_unlock(struct omap_dss_device *dssdev)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        up(&dsi->bus_lock);
}

static bool dsi_bus_is_locked(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        return dsi->bus_lock.count == 0;
}

static void dsi_completion_handler(void *data, u32 mask)
{
        complete((struct completion *)data);
}

static inline int wait_for_bit_change(struct platform_device *dsidev,
                const struct dsi_reg idx, int bitnum, int value)
{
        unsigned long timeout;
        ktime_t wait;
        int t;

        /* first busyloop to see if the bit changes right away */
        t = 100;
        while (t-- > 0) {
                if (REG_GET(dsidev, idx, bitnum, bitnum) == value)
                        return value;
        }

        /* then loop for 500ms, sleeping for 1ms in between */
        timeout = jiffies + msecs_to_jiffies(500);
        while (time_before(jiffies, timeout)) {
                if (REG_GET(dsidev, idx, bitnum, bitnum) == value)
                        return value;

                wait = ns_to_ktime(1000 * 1000);
                set_current_state(TASK_UNINTERRUPTIBLE);
                schedule_hrtimeout(&wait, HRTIMER_MODE_REL);
        }

        return !value;
}

u8 dsi_get_pixel_size(enum omap_dss_dsi_pixel_format fmt)
{
        switch (fmt) {
        case OMAP_DSS_DSI_FMT_RGB888:
        case OMAP_DSS_DSI_FMT_RGB666:
                return 24;
        case OMAP_DSS_DSI_FMT_RGB666_PACKED:
                return 18;
        case OMAP_DSS_DSI_FMT_RGB565:
                return 16;
        default:
                BUG();
                return 0;
        }
}

#ifdef DSI_PERF_MEASURE
static void dsi_perf_mark_setup(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        dsi->perf_setup_time = ktime_get();
}

static void dsi_perf_mark_start(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        dsi->perf_start_time = ktime_get();
}

static void dsi_perf_show(struct platform_device *dsidev, const char *name)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        ktime_t t, setup_time, trans_time;
        u32 total_bytes;
        u32 setup_us, trans_us, total_us;

        if (!dsi_perf)
                return;

        t = ktime_get();

        setup_time = ktime_sub(dsi->perf_start_time, dsi->perf_setup_time);
        setup_us = (u32)ktime_to_us(setup_time);
        if (setup_us == 0)
                setup_us = 1;

        trans_time = ktime_sub(t, dsi->perf_start_time);
        trans_us = (u32)ktime_to_us(trans_time);
        if (trans_us == 0)
                trans_us = 1;

        total_us = setup_us + trans_us;

        total_bytes = dsi->update_bytes;

        printk(KERN_INFO "DSI(%s): %u us + %u us = %u us (%uHz), "
                        "%u bytes, %u kbytes/sec\n",
                        name,
                        setup_us,
                        trans_us,
                        total_us,
                        1000*1000 / total_us,
                        total_bytes,
                        total_bytes * 1000 / total_us);
}
#else
static inline void dsi_perf_mark_setup(struct platform_device *dsidev)
{
}

static inline void dsi_perf_mark_start(struct platform_device *dsidev)
{
}

static inline void dsi_perf_show(struct platform_device *dsidev,
                const char *name)
{
}
#endif

static int verbose_irq;

static void print_irq_status(u32 status)
{
        if (status == 0)
                return;

        if (!verbose_irq && (status & ~DSI_IRQ_CHANNEL_MASK) == 0)
                return;

#define PIS(x) (status & DSI_IRQ_##x) ? (#x " ") : ""

        pr_debug("DSI IRQ: 0x%x: %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
                status,
                verbose_irq ? PIS(VC0) : "",
                verbose_irq ? PIS(VC1) : "",
                verbose_irq ? PIS(VC2) : "",
                verbose_irq ? PIS(VC3) : "",
                PIS(WAKEUP),
                PIS(RESYNC),
                PIS(PLL_LOCK),
                PIS(PLL_UNLOCK),
                PIS(PLL_RECALL),
                PIS(COMPLEXIO_ERR),
                PIS(HS_TX_TIMEOUT),
                PIS(LP_RX_TIMEOUT),
                PIS(TE_TRIGGER),
                PIS(ACK_TRIGGER),
                PIS(SYNC_LOST),
                PIS(LDO_POWER_GOOD),
                PIS(TA_TIMEOUT));
#undef PIS
}

static void print_irq_status_vc(int channel, u32 status)
{
        if (status == 0)
                return;

        if (!verbose_irq && (status & ~DSI_VC_IRQ_PACKET_SENT) == 0)
                return;

#define PIS(x) (status & DSI_VC_IRQ_##x) ? (#x " ") : ""

        pr_debug("DSI VC(%d) IRQ 0x%x: %s%s%s%s%s%s%s%s%s\n",
                channel,
                status,
                PIS(CS),
                PIS(ECC_CORR),
                PIS(ECC_NO_CORR),
                verbose_irq ? PIS(PACKET_SENT) : "",
                PIS(BTA),
                PIS(FIFO_TX_OVF),
                PIS(FIFO_RX_OVF),
                PIS(FIFO_TX_UDF),
                PIS(PP_BUSY_CHANGE));
#undef PIS
}

static void print_irq_status_cio(u32 status)
{
        if (status == 0)
                return;

#define PIS(x) (status & DSI_CIO_IRQ_##x) ? (#x " ") : ""

        pr_debug("DSI CIO IRQ 0x%x: %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
                status,
                PIS(ERRSYNCESC1),
                PIS(ERRSYNCESC2),
                PIS(ERRSYNCESC3),
                PIS(ERRESC1),
                PIS(ERRESC2),
                PIS(ERRESC3),
                PIS(ERRCONTROL1),
                PIS(ERRCONTROL2),
                PIS(ERRCONTROL3),
                PIS(STATEULPS1),
                PIS(STATEULPS2),
                PIS(STATEULPS3),
                PIS(ERRCONTENTIONLP0_1),
                PIS(ERRCONTENTIONLP1_1),
                PIS(ERRCONTENTIONLP0_2),
                PIS(ERRCONTENTIONLP1_2),
                PIS(ERRCONTENTIONLP0_3),
                PIS(ERRCONTENTIONLP1_3),
                PIS(ULPSACTIVENOT_ALL0),
                PIS(ULPSACTIVENOT_ALL1));
#undef PIS
}

#ifdef CONFIG_FB_OMAP2_DSS_COLLECT_IRQ_STATS
static void dsi_collect_irq_stats(struct platform_device *dsidev, u32 irqstatus,
                u32 *vcstatus, u32 ciostatus)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int i;

        spin_lock(&dsi->irq_stats_lock);

        dsi->irq_stats.irq_count++;
        dss_collect_irq_stats(irqstatus, dsi->irq_stats.dsi_irqs);

        for (i = 0; i < 4; ++i)
                dss_collect_irq_stats(vcstatus[i], dsi->irq_stats.vc_irqs[i]);

        dss_collect_irq_stats(ciostatus, dsi->irq_stats.cio_irqs);

        spin_unlock(&dsi->irq_stats_lock);
}
#else
#define dsi_collect_irq_stats(dsidev, irqstatus, vcstatus, ciostatus)
#endif

static int debug_irq;

static void dsi_handle_irq_errors(struct platform_device *dsidev, u32 irqstatus,
                u32 *vcstatus, u32 ciostatus)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int i;

        if (irqstatus & DSI_IRQ_ERROR_MASK) {
                DSSERR("DSI error, irqstatus %x\n", irqstatus);
                print_irq_status(irqstatus);
                spin_lock(&dsi->errors_lock);
                dsi->errors |= irqstatus & DSI_IRQ_ERROR_MASK;
                spin_unlock(&dsi->errors_lock);
        } else if (debug_irq) {
                print_irq_status(irqstatus);
        }

        for (i = 0; i < 4; ++i) {
                if (vcstatus[i] & DSI_VC_IRQ_ERROR_MASK) {
                        DSSERR("DSI VC(%d) error, vc irqstatus %x\n",
                                       i, vcstatus[i]);
                        print_irq_status_vc(i, vcstatus[i]);
                } else if (debug_irq) {
                        print_irq_status_vc(i, vcstatus[i]);
                }
        }

        if (ciostatus & DSI_CIO_IRQ_ERROR_MASK) {
                DSSERR("DSI CIO error, cio irqstatus %x\n", ciostatus);
                print_irq_status_cio(ciostatus);
        } else if (debug_irq) {
                print_irq_status_cio(ciostatus);
        }
}

static void dsi_call_isrs(struct dsi_isr_data *isr_array,
                unsigned isr_array_size, u32 irqstatus)
{
        struct dsi_isr_data *isr_data;
        int i;

        for (i = 0; i < isr_array_size; i++) {
                isr_data = &isr_array[i];
                if (isr_data->isr && isr_data->mask & irqstatus)
                        isr_data->isr(isr_data->arg, irqstatus);
        }
}

static void dsi_handle_isrs(struct dsi_isr_tables *isr_tables,
                u32 irqstatus, u32 *vcstatus, u32 ciostatus)
{
        int i;

        dsi_call_isrs(isr_tables->isr_table,
                        ARRAY_SIZE(isr_tables->isr_table),
                        irqstatus);

        for (i = 0; i < 4; ++i) {
                if (vcstatus[i] == 0)
                        continue;
                dsi_call_isrs(isr_tables->isr_table_vc[i],
                                ARRAY_SIZE(isr_tables->isr_table_vc[i]),
                                vcstatus[i]);
        }

        if (ciostatus != 0)
                dsi_call_isrs(isr_tables->isr_table_cio,
                                ARRAY_SIZE(isr_tables->isr_table_cio),
                                ciostatus);
}

static irqreturn_t omap_dsi_irq_handler(int irq, void *arg)
{
        struct platform_device *dsidev;
        struct dsi_data *dsi;
        u32 irqstatus, vcstatus[4], ciostatus;
        int i;

        dsidev = (struct platform_device *) arg;
        dsi = dsi_get_dsidrv_data(dsidev);

        if (!dsi->is_enabled)
                return IRQ_NONE;

        spin_lock(&dsi->irq_lock);

        irqstatus = dsi_read_reg(dsidev, DSI_IRQSTATUS);

        /* IRQ is not for us */
        if (!irqstatus) {
                spin_unlock(&dsi->irq_lock);
                return IRQ_NONE;
        }

        dsi_write_reg(dsidev, DSI_IRQSTATUS, irqstatus & ~DSI_IRQ_CHANNEL_MASK);
        /* flush posted write */
        dsi_read_reg(dsidev, DSI_IRQSTATUS);

        for (i = 0; i < 4; ++i) {
                if ((irqstatus & (1 << i)) == 0) {
                        vcstatus[i] = 0;
                        continue;
                }

                vcstatus[i] = dsi_read_reg(dsidev, DSI_VC_IRQSTATUS(i));

                dsi_write_reg(dsidev, DSI_VC_IRQSTATUS(i), vcstatus[i]);
                /* flush posted write */
                dsi_read_reg(dsidev, DSI_VC_IRQSTATUS(i));
        }

        if (irqstatus & DSI_IRQ_COMPLEXIO_ERR) {
                ciostatus = dsi_read_reg(dsidev, DSI_COMPLEXIO_IRQ_STATUS);

                dsi_write_reg(dsidev, DSI_COMPLEXIO_IRQ_STATUS, ciostatus);
                /* flush posted write */
                dsi_read_reg(dsidev, DSI_COMPLEXIO_IRQ_STATUS);
        } else {
                ciostatus = 0;
        }

#ifdef DSI_CATCH_MISSING_TE
        if (irqstatus & DSI_IRQ_TE_TRIGGER)
                del_timer(&dsi->te_timer);
#endif

        /* make a copy and unlock, so that isrs can unregister
         * themselves */
        memcpy(&dsi->isr_tables_copy, &dsi->isr_tables,
                sizeof(dsi->isr_tables));

        spin_unlock(&dsi->irq_lock);

        dsi_handle_isrs(&dsi->isr_tables_copy, irqstatus, vcstatus, ciostatus);

        dsi_handle_irq_errors(dsidev, irqstatus, vcstatus, ciostatus);

        dsi_collect_irq_stats(dsidev, irqstatus, vcstatus, ciostatus);

        return IRQ_HANDLED;
}

/* dsi->irq_lock has to be locked by the caller */
static void _omap_dsi_configure_irqs(struct platform_device *dsidev,
                struct dsi_isr_data *isr_array,
                unsigned isr_array_size, u32 default_mask,
                const struct dsi_reg enable_reg,
                const struct dsi_reg status_reg)
{
        struct dsi_isr_data *isr_data;
        u32 mask;
        u32 old_mask;
        int i;

        mask = default_mask;

        for (i = 0; i < isr_array_size; i++) {
                isr_data = &isr_array[i];

                if (isr_data->isr == NULL)
                        continue;

                mask |= isr_data->mask;
        }

        old_mask = dsi_read_reg(dsidev, enable_reg);
        /* clear the irqstatus for newly enabled irqs */
        dsi_write_reg(dsidev, status_reg, (mask ^ old_mask) & mask);
        dsi_write_reg(dsidev, enable_reg, mask);

        /* flush posted writes */
        dsi_read_reg(dsidev, enable_reg);
        dsi_read_reg(dsidev, status_reg);
}

/* dsi->irq_lock has to be locked by the caller */
static void _omap_dsi_set_irqs(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u32 mask = DSI_IRQ_ERROR_MASK;
#ifdef DSI_CATCH_MISSING_TE
        mask |= DSI_IRQ_TE_TRIGGER;
#endif
        _omap_dsi_configure_irqs(dsidev, dsi->isr_tables.isr_table,
                        ARRAY_SIZE(dsi->isr_tables.isr_table), mask,
                        DSI_IRQENABLE, DSI_IRQSTATUS);
}

/* dsi->irq_lock has to be locked by the caller */
static void _omap_dsi_set_irqs_vc(struct platform_device *dsidev, int vc)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        _omap_dsi_configure_irqs(dsidev, dsi->isr_tables.isr_table_vc[vc],
                        ARRAY_SIZE(dsi->isr_tables.isr_table_vc[vc]),
                        DSI_VC_IRQ_ERROR_MASK,
                        DSI_VC_IRQENABLE(vc), DSI_VC_IRQSTATUS(vc));
}

/* dsi->irq_lock has to be locked by the caller */
static void _omap_dsi_set_irqs_cio(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        _omap_dsi_configure_irqs(dsidev, dsi->isr_tables.isr_table_cio,
                        ARRAY_SIZE(dsi->isr_tables.isr_table_cio),
                        DSI_CIO_IRQ_ERROR_MASK,
                        DSI_COMPLEXIO_IRQ_ENABLE, DSI_COMPLEXIO_IRQ_STATUS);
}

static void _dsi_initialize_irq(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        int vc;

        spin_lock_irqsave(&dsi->irq_lock, flags);

        memset(&dsi->isr_tables, 0, sizeof(dsi->isr_tables));

        _omap_dsi_set_irqs(dsidev);
        for (vc = 0; vc < 4; ++vc)
                _omap_dsi_set_irqs_vc(dsidev, vc);
        _omap_dsi_set_irqs_cio(dsidev);

        spin_unlock_irqrestore(&dsi->irq_lock, flags);
}

static int _dsi_register_isr(omap_dsi_isr_t isr, void *arg, u32 mask,
                struct dsi_isr_data *isr_array, unsigned isr_array_size)
{
        struct dsi_isr_data *isr_data;
        int free_idx;
        int i;

        BUG_ON(isr == NULL);

        /* check for duplicate entry and find a free slot */
        free_idx = -1;
        for (i = 0; i < isr_array_size; i++) {
                isr_data = &isr_array[i];

                if (isr_data->isr == isr && isr_data->arg == arg &&
                                isr_data->mask == mask) {
                        return -EINVAL;
                }

                if (isr_data->isr == NULL && free_idx == -1)
                        free_idx = i;
        }

        if (free_idx == -1)
                return -EBUSY;

        isr_data = &isr_array[free_idx];
        isr_data->isr = isr;
        isr_data->arg = arg;
        isr_data->mask = mask;

        return 0;
}

static int _dsi_unregister_isr(omap_dsi_isr_t isr, void *arg, u32 mask,
                struct dsi_isr_data *isr_array, unsigned isr_array_size)
{
        struct dsi_isr_data *isr_data;
        int i;

        for (i = 0; i < isr_array_size; i++) {
                isr_data = &isr_array[i];
                if (isr_data->isr != isr || isr_data->arg != arg ||
                                isr_data->mask != mask)
                        continue;

                isr_data->isr = NULL;
                isr_data->arg = NULL;

                isr_data->mask = 0;

                return 0;
        }

        return -EINVAL;
}

static int dsi_register_isr(struct platform_device *dsidev, omap_dsi_isr_t isr,
                void *arg, u32 mask)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        int r;

        spin_lock_irqsave(&dsi->irq_lock, flags);

        r = _dsi_register_isr(isr, arg, mask, dsi->isr_tables.isr_table,
                        ARRAY_SIZE(dsi->isr_tables.isr_table));

        if (r == 0)
                _omap_dsi_set_irqs(dsidev);

        spin_unlock_irqrestore(&dsi->irq_lock, flags);

        return r;
}

static int dsi_unregister_isr(struct platform_device *dsidev,
                omap_dsi_isr_t isr, void *arg, u32 mask)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        int r;

        spin_lock_irqsave(&dsi->irq_lock, flags);

        r = _dsi_unregister_isr(isr, arg, mask, dsi->isr_tables.isr_table,
                        ARRAY_SIZE(dsi->isr_tables.isr_table));

        if (r == 0)
                _omap_dsi_set_irqs(dsidev);

        spin_unlock_irqrestore(&dsi->irq_lock, flags);

        return r;
}

static int dsi_register_isr_vc(struct platform_device *dsidev, int channel,
                omap_dsi_isr_t isr, void *arg, u32 mask)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        int r;

        spin_lock_irqsave(&dsi->irq_lock, flags);

        r = _dsi_register_isr(isr, arg, mask,
                        dsi->isr_tables.isr_table_vc[channel],
                        ARRAY_SIZE(dsi->isr_tables.isr_table_vc[channel]));

        if (r == 0)
                _omap_dsi_set_irqs_vc(dsidev, channel);

        spin_unlock_irqrestore(&dsi->irq_lock, flags);

        return r;
}

static int dsi_unregister_isr_vc(struct platform_device *dsidev, int channel,
                omap_dsi_isr_t isr, void *arg, u32 mask)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        int r;

        spin_lock_irqsave(&dsi->irq_lock, flags);

        r = _dsi_unregister_isr(isr, arg, mask,
                        dsi->isr_tables.isr_table_vc[channel],
                        ARRAY_SIZE(dsi->isr_tables.isr_table_vc[channel]));

        if (r == 0)
                _omap_dsi_set_irqs_vc(dsidev, channel);

        spin_unlock_irqrestore(&dsi->irq_lock, flags);

        return r;
}

static int dsi_register_isr_cio(struct platform_device *dsidev,
                omap_dsi_isr_t isr, void *arg, u32 mask)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        int r;

        spin_lock_irqsave(&dsi->irq_lock, flags);

        r = _dsi_register_isr(isr, arg, mask, dsi->isr_tables.isr_table_cio,
                        ARRAY_SIZE(dsi->isr_tables.isr_table_cio));

        if (r == 0)
                _omap_dsi_set_irqs_cio(dsidev);

        spin_unlock_irqrestore(&dsi->irq_lock, flags);

        return r;
}

static int dsi_unregister_isr_cio(struct platform_device *dsidev,
                omap_dsi_isr_t isr, void *arg, u32 mask)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        int r;

        spin_lock_irqsave(&dsi->irq_lock, flags);

        r = _dsi_unregister_isr(isr, arg, mask, dsi->isr_tables.isr_table_cio,
                        ARRAY_SIZE(dsi->isr_tables.isr_table_cio));

        if (r == 0)
                _omap_dsi_set_irqs_cio(dsidev);

        spin_unlock_irqrestore(&dsi->irq_lock, flags);

        return r;
}

static u32 dsi_get_errors(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        u32 e;
        spin_lock_irqsave(&dsi->errors_lock, flags);
        e = dsi->errors;
        dsi->errors = 0;
        spin_unlock_irqrestore(&dsi->errors_lock, flags);
        return e;
}

static int dsi_runtime_get(struct platform_device *dsidev)
{
        int r;
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        DSSDBG("dsi_runtime_get\n");

        r = pm_runtime_get_sync(&dsi->pdev->dev);
        WARN_ON(r < 0);
        return r < 0 ? r : 0;
}

static void dsi_runtime_put(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int r;

        DSSDBG("dsi_runtime_put\n");

        r = pm_runtime_put_sync(&dsi->pdev->dev);
        WARN_ON(r < 0 && r != -ENOSYS);
}

static int dsi_regulator_init(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        struct regulator *vdds_dsi;

        if (dsi->vdds_dsi_reg != NULL)
                return 0;

        vdds_dsi = devm_regulator_get(&dsi->pdev->dev, "vdd");

        if (IS_ERR(vdds_dsi)) {
                if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
                        DSSERR("can't get DSI VDD regulator\n");
                return PTR_ERR(vdds_dsi);
        }

        dsi->vdds_dsi_reg = vdds_dsi;

        return 0;
}

static void _dsi_print_reset_status(struct platform_device *dsidev)
{
        u32 l;
        int b0, b1, b2;

        /* A dummy read using the SCP interface to any DSIPHY register is
         * required after DSIPHY reset to complete the reset of the DSI complex
         * I/O. */
        l = dsi_read_reg(dsidev, DSI_DSIPHY_CFG5);

        if (dss_has_feature(FEAT_DSI_REVERSE_TXCLKESC)) {
                b0 = 28;
                b1 = 27;
                b2 = 26;
        } else {
                b0 = 24;
                b1 = 25;
                b2 = 26;
        }

#define DSI_FLD_GET(fld, start, end)\
        FLD_GET(dsi_read_reg(dsidev, DSI_##fld), start, end)

        pr_debug("DSI resets: PLL (%d) CIO (%d) PHY (%x%x%x, %d, %d, %d)\n",
                DSI_FLD_GET(PLL_STATUS, 0, 0),
                DSI_FLD_GET(COMPLEXIO_CFG1, 29, 29),
                DSI_FLD_GET(DSIPHY_CFG5, b0, b0),
                DSI_FLD_GET(DSIPHY_CFG5, b1, b1),
                DSI_FLD_GET(DSIPHY_CFG5, b2, b2),
                DSI_FLD_GET(DSIPHY_CFG5, 29, 29),
                DSI_FLD_GET(DSIPHY_CFG5, 30, 30),
                DSI_FLD_GET(DSIPHY_CFG5, 31, 31));

#undef DSI_FLD_GET
}

static inline int dsi_if_enable(struct platform_device *dsidev, bool enable)
{
        DSSDBG("dsi_if_enable(%d)\n", enable);

        enable = enable ? 1 : 0;
        REG_FLD_MOD(dsidev, DSI_CTRL, enable, 0, 0); /* IF_EN */

        if (wait_for_bit_change(dsidev, DSI_CTRL, 0, enable) != enable) {
                        DSSERR("Failed to set dsi_if_enable to %d\n", enable);
                        return -EIO;
        }

        return 0;
}

static unsigned long dsi_get_pll_hsdiv_dispc_rate(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        return dsi->pll.cinfo.clkout[HSDIV_DISPC];
}

static unsigned long dsi_get_pll_hsdiv_dsi_rate(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        return dsi->pll.cinfo.clkout[HSDIV_DSI];
}

static unsigned long dsi_get_txbyteclkhs(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        return dsi->pll.cinfo.clkdco / 16;
}

static unsigned long dsi_fclk_rate(struct platform_device *dsidev)
{
        unsigned long r;
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        if (dss_get_dsi_clk_source(dsi->module_id) == OMAP_DSS_CLK_SRC_FCK) {
                /* DSI FCLK source is DSS_CLK_FCK */
                r = clk_get_rate(dsi->dss_clk);
        } else {
                /* DSI FCLK source is dsi_pll_hsdiv_dsi_clk */
                r = dsi_get_pll_hsdiv_dsi_rate(dsidev);
        }

        return r;
}

static int dsi_lp_clock_calc(unsigned long dsi_fclk,
                unsigned long lp_clk_min, unsigned long lp_clk_max,
                struct dsi_lp_clock_info *lp_cinfo)
{
        unsigned lp_clk_div;
        unsigned long lp_clk;

        lp_clk_div = DIV_ROUND_UP(dsi_fclk, lp_clk_max * 2);
        lp_clk = dsi_fclk / 2 / lp_clk_div;

        if (lp_clk < lp_clk_min || lp_clk > lp_clk_max)
                return -EINVAL;

        lp_cinfo->lp_clk_div = lp_clk_div;
        lp_cinfo->lp_clk = lp_clk;

        return 0;
}

static int dsi_set_lp_clk_divisor(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long dsi_fclk;
        unsigned lp_clk_div;
        unsigned long lp_clk;
        unsigned lpdiv_max = dss_feat_get_param_max(FEAT_PARAM_DSIPLL_LPDIV);


        lp_clk_div = dsi->user_lp_cinfo.lp_clk_div;

        if (lp_clk_div == 0 || lp_clk_div > lpdiv_max)
                return -EINVAL;

        dsi_fclk = dsi_fclk_rate(dsidev);

        lp_clk = dsi_fclk / 2 / lp_clk_div;

        DSSDBG("LP_CLK_DIV %u, LP_CLK %lu\n", lp_clk_div, lp_clk);
        dsi->current_lp_cinfo.lp_clk = lp_clk;
        dsi->current_lp_cinfo.lp_clk_div = lp_clk_div;

        /* LP_CLK_DIVISOR */
        REG_FLD_MOD(dsidev, DSI_CLK_CTRL, lp_clk_div, 12, 0);

        /* LP_RX_SYNCHRO_ENABLE */
        REG_FLD_MOD(dsidev, DSI_CLK_CTRL, dsi_fclk > 30000000 ? 1 : 0, 21, 21);

        return 0;
}

static void dsi_enable_scp_clk(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        if (dsi->scp_clk_refcount++ == 0)
                REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 1, 14, 14); /* CIO_CLK_ICG */
}

static void dsi_disable_scp_clk(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        WARN_ON(dsi->scp_clk_refcount == 0);
        if (--dsi->scp_clk_refcount == 0)
                REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 0, 14, 14); /* CIO_CLK_ICG */
}

enum dsi_pll_power_state {
        DSI_PLL_POWER_OFF       = 0x0,
        DSI_PLL_POWER_ON_HSCLK  = 0x1,
        DSI_PLL_POWER_ON_ALL    = 0x2,
        DSI_PLL_POWER_ON_DIV    = 0x3,
};

static int dsi_pll_power(struct platform_device *dsidev,
                enum dsi_pll_power_state state)
{
        int t = 0;

        /* DSI-PLL power command 0x3 is not working */
        if (dss_has_feature(FEAT_DSI_PLL_PWR_BUG) &&
                        state == DSI_PLL_POWER_ON_DIV)
                state = DSI_PLL_POWER_ON_ALL;

        /* PLL_PWR_CMD */
        REG_FLD_MOD(dsidev, DSI_CLK_CTRL, state, 31, 30);

        /* PLL_PWR_STATUS */
        while (FLD_GET(dsi_read_reg(dsidev, DSI_CLK_CTRL), 29, 28) != state) {
                if (++t > 1000) {
                        DSSERR("Failed to set DSI PLL power mode to %d\n",
                                        state);
                        return -ENODEV;
                }
                udelay(1);
        }

        return 0;
}


static void dsi_pll_calc_dsi_fck(struct dss_pll_clock_info *cinfo)
{
        unsigned long max_dsi_fck;

        max_dsi_fck = dss_feat_get_param_max(FEAT_PARAM_DSI_FCK);

        cinfo->mX[HSDIV_DSI] = DIV_ROUND_UP(cinfo->clkdco, max_dsi_fck);
        cinfo->clkout[HSDIV_DSI] = cinfo->clkdco / cinfo->mX[HSDIV_DSI];
}

static int dsi_pll_enable(struct dss_pll *pll)
{
        struct dsi_data *dsi = container_of(pll, struct dsi_data, pll);
        struct platform_device *dsidev = dsi->pdev;
        int r = 0;

        DSSDBG("PLL init\n");

        r = dsi_regulator_init(dsidev);
        if (r)
                return r;

        r = dsi_runtime_get(dsidev);
        if (r)
                return r;

        /*
         * Note: SCP CLK is not required on OMAP3, but it is required on OMAP4.
         */
        dsi_enable_scp_clk(dsidev);

        if (!dsi->vdds_dsi_enabled) {
                r = regulator_enable(dsi->vdds_dsi_reg);
                if (r)
                        goto err0;
                dsi->vdds_dsi_enabled = true;
        }

        /* XXX PLL does not come out of reset without this... */
        dispc_pck_free_enable(1);

        if (wait_for_bit_change(dsidev, DSI_PLL_STATUS, 0, 1) != 1) {
                DSSERR("PLL not coming out of reset.\n");
                r = -ENODEV;
                dispc_pck_free_enable(0);
                goto err1;
        }

        /* XXX ... but if left on, we get problems when planes do not
         * fill the whole display. No idea about this */
        dispc_pck_free_enable(0);

        r = dsi_pll_power(dsidev, DSI_PLL_POWER_ON_ALL);

        if (r)
                goto err1;

        DSSDBG("PLL init done\n");

        return 0;
err1:
        if (dsi->vdds_dsi_enabled) {
                regulator_disable(dsi->vdds_dsi_reg);
                dsi->vdds_dsi_enabled = false;
        }
err0:
        dsi_disable_scp_clk(dsidev);
        dsi_runtime_put(dsidev);
        return r;
}

static void dsi_pll_uninit(struct platform_device *dsidev, bool disconnect_lanes)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        dsi_pll_power(dsidev, DSI_PLL_POWER_OFF);
        if (disconnect_lanes) {
                WARN_ON(!dsi->vdds_dsi_enabled);
                regulator_disable(dsi->vdds_dsi_reg);
                dsi->vdds_dsi_enabled = false;
        }

        dsi_disable_scp_clk(dsidev);
        dsi_runtime_put(dsidev);

        DSSDBG("PLL uninit done\n");
}

static void dsi_pll_disable(struct dss_pll *pll)
{
        struct dsi_data *dsi = container_of(pll, struct dsi_data, pll);
        struct platform_device *dsidev = dsi->pdev;

        dsi_pll_uninit(dsidev, true);
}

static void dsi_dump_dsidev_clocks(struct platform_device *dsidev,
                struct seq_file *s)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        struct dss_pll_clock_info *cinfo = &dsi->pll.cinfo;
        enum omap_dss_clk_source dispc_clk_src, dsi_clk_src;
        int dsi_module = dsi->module_id;
        struct dss_pll *pll = &dsi->pll;

        dispc_clk_src = dss_get_dispc_clk_source();
        dsi_clk_src = dss_get_dsi_clk_source(dsi_module);

        if (dsi_runtime_get(dsidev))
                return;

        seq_printf(s,   "- DSI%d PLL -\n", dsi_module + 1);

        seq_printf(s,   "dsi pll clkin\t%lu\n", clk_get_rate(pll->clkin));

        seq_printf(s,   "Fint\t\t%-16lun %u\n", cinfo->fint, cinfo->n);

        seq_printf(s,   "CLKIN4DDR\t%-16lum %u\n",
                        cinfo->clkdco, cinfo->m);

        seq_printf(s,   "DSI_PLL_HSDIV_DISPC (%s)\t%-16lum_dispc %u\t(%s)\n",
                        dss_feat_get_clk_source_name(dsi_module == 0 ?
                                OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC :
                                OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC),
                        cinfo->clkout[HSDIV_DISPC],
                        cinfo->mX[HSDIV_DISPC],
                        dispc_clk_src == OMAP_DSS_CLK_SRC_FCK ?
                        "off" : "on");

        seq_printf(s,   "DSI_PLL_HSDIV_DSI (%s)\t%-16lum_dsi %u\t(%s)\n",
                        dss_feat_get_clk_source_name(dsi_module == 0 ?
                                OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DSI :
                                OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DSI),
                        cinfo->clkout[HSDIV_DSI],
                        cinfo->mX[HSDIV_DSI],
                        dsi_clk_src == OMAP_DSS_CLK_SRC_FCK ?
                        "off" : "on");

        seq_printf(s,   "- DSI%d -\n", dsi_module + 1);

        seq_printf(s,   "dsi fclk source = %s (%s)\n",
                        dss_get_generic_clk_source_name(dsi_clk_src),
                        dss_feat_get_clk_source_name(dsi_clk_src));

        seq_printf(s,   "DSI_FCLK\t%lu\n", dsi_fclk_rate(dsidev));

        seq_printf(s,   "DDR_CLK\t\t%lu\n",
                        cinfo->clkdco / 4);

        seq_printf(s,   "TxByteClkHS\t%lu\n", dsi_get_txbyteclkhs(dsidev));

        seq_printf(s,   "LP_CLK\t\t%lu\n", dsi->current_lp_cinfo.lp_clk);

        dsi_runtime_put(dsidev);
}

void dsi_dump_clocks(struct seq_file *s)
{
        struct platform_device *dsidev;
        int i;

        for  (i = 0; i < MAX_NUM_DSI; i++) {
                dsidev = dsi_get_dsidev_from_id(i);
                if (dsidev)
                        dsi_dump_dsidev_clocks(dsidev, s);
        }
}

#ifdef CONFIG_FB_OMAP2_DSS_COLLECT_IRQ_STATS
static void dsi_dump_dsidev_irqs(struct platform_device *dsidev,
                struct seq_file *s)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned long flags;
        struct dsi_irq_stats stats;

        spin_lock_irqsave(&dsi->irq_stats_lock, flags);

        stats = dsi->irq_stats;
        memset(&dsi->irq_stats, 0, sizeof(dsi->irq_stats));
        dsi->irq_stats.last_reset = jiffies;

        spin_unlock_irqrestore(&dsi->irq_stats_lock, flags);

        seq_printf(s, "period %u ms\n",
                        jiffies_to_msecs(jiffies - stats.last_reset));

        seq_printf(s, "irqs %d\n", stats.irq_count);
#define PIS(x) \
        seq_printf(s, "%-20s %10d\n", #x, stats.dsi_irqs[ffs(DSI_IRQ_##x)-1]);

        seq_printf(s, "-- DSI%d interrupts --\n", dsi->module_id + 1);
        PIS(VC0);
        PIS(VC1);
        PIS(VC2);
        PIS(VC3);
        PIS(WAKEUP);
        PIS(RESYNC);
        PIS(PLL_LOCK);
        PIS(PLL_UNLOCK);
        PIS(PLL_RECALL);
        PIS(COMPLEXIO_ERR);
        PIS(HS_TX_TIMEOUT);
        PIS(LP_RX_TIMEOUT);
        PIS(TE_TRIGGER);
        PIS(ACK_TRIGGER);
        PIS(SYNC_LOST);
        PIS(LDO_POWER_GOOD);
        PIS(TA_TIMEOUT);
#undef PIS

#define PIS(x) \
        seq_printf(s, "%-20s %10d %10d %10d %10d\n", #x, \
                        stats.vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \
                        stats.vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \
                        stats.vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \
                        stats.vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]);

        seq_printf(s, "-- VC interrupts --\n");
        PIS(CS);
        PIS(ECC_CORR);
        PIS(PACKET_SENT);
        PIS(FIFO_TX_OVF);
        PIS(FIFO_RX_OVF);
        PIS(BTA);
        PIS(ECC_NO_CORR);
        PIS(FIFO_TX_UDF);
        PIS(PP_BUSY_CHANGE);
#undef PIS

#define PIS(x) \
        seq_printf(s, "%-20s %10d\n", #x, \
                        stats.cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]);

        seq_printf(s, "-- CIO interrupts --\n");
        PIS(ERRSYNCESC1);
        PIS(ERRSYNCESC2);
        PIS(ERRSYNCESC3);
        PIS(ERRESC1);
        PIS(ERRESC2);
        PIS(ERRESC3);
        PIS(ERRCONTROL1);
        PIS(ERRCONTROL2);
        PIS(ERRCONTROL3);
        PIS(STATEULPS1);
        PIS(STATEULPS2);
        PIS(STATEULPS3);
        PIS(ERRCONTENTIONLP0_1);
        PIS(ERRCONTENTIONLP1_1);
        PIS(ERRCONTENTIONLP0_2);
        PIS(ERRCONTENTIONLP1_2);
        PIS(ERRCONTENTIONLP0_3);
        PIS(ERRCONTENTIONLP1_3);
        PIS(ULPSACTIVENOT_ALL0);
        PIS(ULPSACTIVENOT_ALL1);
#undef PIS
}

static void dsi1_dump_irqs(struct seq_file *s)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_id(0);

        dsi_dump_dsidev_irqs(dsidev, s);
}

static void dsi2_dump_irqs(struct seq_file *s)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_id(1);

        dsi_dump_dsidev_irqs(dsidev, s);
}
#endif

static void dsi_dump_dsidev_regs(struct platform_device *dsidev,
                struct seq_file *s)
{
#define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dsi_read_reg(dsidev, r))

        if (dsi_runtime_get(dsidev))
                return;
        dsi_enable_scp_clk(dsidev);

        DUMPREG(DSI_REVISION);
        DUMPREG(DSI_SYSCONFIG);
        DUMPREG(DSI_SYSSTATUS);
        DUMPREG(DSI_IRQSTATUS);
        DUMPREG(DSI_IRQENABLE);
        DUMPREG(DSI_CTRL);
        DUMPREG(DSI_COMPLEXIO_CFG1);
        DUMPREG(DSI_COMPLEXIO_IRQ_STATUS);
        DUMPREG(DSI_COMPLEXIO_IRQ_ENABLE);
        DUMPREG(DSI_CLK_CTRL);
        DUMPREG(DSI_TIMING1);
        DUMPREG(DSI_TIMING2);
        DUMPREG(DSI_VM_TIMING1);
        DUMPREG(DSI_VM_TIMING2);
        DUMPREG(DSI_VM_TIMING3);
        DUMPREG(DSI_CLK_TIMING);
        DUMPREG(DSI_TX_FIFO_VC_SIZE);
        DUMPREG(DSI_RX_FIFO_VC_SIZE);
        DUMPREG(DSI_COMPLEXIO_CFG2);
        DUMPREG(DSI_RX_FIFO_VC_FULLNESS);
        DUMPREG(DSI_VM_TIMING4);
        DUMPREG(DSI_TX_FIFO_VC_EMPTINESS);
        DUMPREG(DSI_VM_TIMING5);
        DUMPREG(DSI_VM_TIMING6);
        DUMPREG(DSI_VM_TIMING7);
        DUMPREG(DSI_STOPCLK_TIMING);

        DUMPREG(DSI_VC_CTRL(0));
        DUMPREG(DSI_VC_TE(0));
        DUMPREG(DSI_VC_LONG_PACKET_HEADER(0));
        DUMPREG(DSI_VC_LONG_PACKET_PAYLOAD(0));
        DUMPREG(DSI_VC_SHORT_PACKET_HEADER(0));
        DUMPREG(DSI_VC_IRQSTATUS(0));
        DUMPREG(DSI_VC_IRQENABLE(0));

        DUMPREG(DSI_VC_CTRL(1));
        DUMPREG(DSI_VC_TE(1));
        DUMPREG(DSI_VC_LONG_PACKET_HEADER(1));
        DUMPREG(DSI_VC_LONG_PACKET_PAYLOAD(1));
        DUMPREG(DSI_VC_SHORT_PACKET_HEADER(1));
        DUMPREG(DSI_VC_IRQSTATUS(1));
        DUMPREG(DSI_VC_IRQENABLE(1));

        DUMPREG(DSI_VC_CTRL(2));
        DUMPREG(DSI_VC_TE(2));
        DUMPREG(DSI_VC_LONG_PACKET_HEADER(2));
        DUMPREG(DSI_VC_LONG_PACKET_PAYLOAD(2));
        DUMPREG(DSI_VC_SHORT_PACKET_HEADER(2));
        DUMPREG(DSI_VC_IRQSTATUS(2));
        DUMPREG(DSI_VC_IRQENABLE(2));

        DUMPREG(DSI_VC_CTRL(3));
        DUMPREG(DSI_VC_TE(3));
        DUMPREG(DSI_VC_LONG_PACKET_HEADER(3));
        DUMPREG(DSI_VC_LONG_PACKET_PAYLOAD(3));
        DUMPREG(DSI_VC_SHORT_PACKET_HEADER(3));
        DUMPREG(DSI_VC_IRQSTATUS(3));
        DUMPREG(DSI_VC_IRQENABLE(3));

        DUMPREG(DSI_DSIPHY_CFG0);
        DUMPREG(DSI_DSIPHY_CFG1);
        DUMPREG(DSI_DSIPHY_CFG2);
        DUMPREG(DSI_DSIPHY_CFG5);

        DUMPREG(DSI_PLL_CONTROL);
        DUMPREG(DSI_PLL_STATUS);
        DUMPREG(DSI_PLL_GO);
        DUMPREG(DSI_PLL_CONFIGURATION1);
        DUMPREG(DSI_PLL_CONFIGURATION2);

        dsi_disable_scp_clk(dsidev);
        dsi_runtime_put(dsidev);
#undef DUMPREG
}

static void dsi1_dump_regs(struct seq_file *s)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_id(0);

        dsi_dump_dsidev_regs(dsidev, s);
}

static void dsi2_dump_regs(struct seq_file *s)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_id(1);

        dsi_dump_dsidev_regs(dsidev, s);
}

enum dsi_cio_power_state {
        DSI_COMPLEXIO_POWER_OFF         = 0x0,
        DSI_COMPLEXIO_POWER_ON          = 0x1,
        DSI_COMPLEXIO_POWER_ULPS        = 0x2,
};

static int dsi_cio_power(struct platform_device *dsidev,
                enum dsi_cio_power_state state)
{
        int t = 0;

        /* PWR_CMD */
        REG_FLD_MOD(dsidev, DSI_COMPLEXIO_CFG1, state, 28, 27);

        /* PWR_STATUS */
        while (FLD_GET(dsi_read_reg(dsidev, DSI_COMPLEXIO_CFG1),
                        26, 25) != state) {
                if (++t > 1000) {
                        DSSERR("failed to set complexio power state to "
                                        "%d\n", state);
                        return -ENODEV;
                }
                udelay(1);
        }

        return 0;
}

static unsigned dsi_get_line_buf_size(struct platform_device *dsidev)
{
        int val;

        /* line buffer on OMAP3 is 1024 x 24bits */
        /* XXX: for some reason using full buffer size causes
         * considerable TX slowdown with update sizes that fill the
         * whole buffer */
        if (!dss_has_feature(FEAT_DSI_GNQ))
                return 1023 * 3;

        val = REG_GET(dsidev, DSI_GNQ, 14, 12); /* VP1_LINE_BUFFER_SIZE */

        switch (val) {
        case 1:
                return 512 * 3;         /* 512x24 bits */
        case 2:
                return 682 * 3;         /* 682x24 bits */
        case 3:
                return 853 * 3;         /* 853x24 bits */
        case 4:
                return 1024 * 3;        /* 1024x24 bits */
        case 5:
                return 1194 * 3;        /* 1194x24 bits */
        case 6:
                return 1365 * 3;        /* 1365x24 bits */
        case 7:
                return 1920 * 3;        /* 1920x24 bits */
        default:
                BUG();
                return 0;
        }
}

static int dsi_set_lane_config(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        static const u8 offsets[] = { 0, 4, 8, 12, 16 };
        static const enum dsi_lane_function functions[] = {
                DSI_LANE_CLK,
                DSI_LANE_DATA1,
                DSI_LANE_DATA2,
                DSI_LANE_DATA3,
                DSI_LANE_DATA4,
        };
        u32 r;
        int i;

        r = dsi_read_reg(dsidev, DSI_COMPLEXIO_CFG1);

        for (i = 0; i < dsi->num_lanes_used; ++i) {
                unsigned offset = offsets[i];
                unsigned polarity, lane_number;
                unsigned t;

                for (t = 0; t < dsi->num_lanes_supported; ++t)
                        if (dsi->lanes[t].function == functions[i])
                                break;

                if (t == dsi->num_lanes_supported)
                        return -EINVAL;

                lane_number = t;
                polarity = dsi->lanes[t].polarity;

                r = FLD_MOD(r, lane_number + 1, offset + 2, offset);
                r = FLD_MOD(r, polarity, offset + 3, offset + 3);
        }

        /* clear the unused lanes */
        for (; i < dsi->num_lanes_supported; ++i) {
                unsigned offset = offsets[i];

                r = FLD_MOD(r, 0, offset + 2, offset);
                r = FLD_MOD(r, 0, offset + 3, offset + 3);
        }

        dsi_write_reg(dsidev, DSI_COMPLEXIO_CFG1, r);

        return 0;
}

static inline unsigned ns2ddr(struct platform_device *dsidev, unsigned ns)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        /* convert time in ns to ddr ticks, rounding up */
        unsigned long ddr_clk = dsi->pll.cinfo.clkdco / 4;
        return (ns * (ddr_clk / 1000 / 1000) + 999) / 1000;
}

static inline unsigned ddr2ns(struct platform_device *dsidev, unsigned ddr)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        unsigned long ddr_clk = dsi->pll.cinfo.clkdco / 4;
        return ddr * 1000 * 1000 / (ddr_clk / 1000);
}

static void dsi_cio_timings(struct platform_device *dsidev)
{
        u32 r;
        u32 ths_prepare, ths_prepare_ths_zero, ths_trail, ths_exit;
        u32 tlpx_half, tclk_trail, tclk_zero;
        u32 tclk_prepare;

        /* calculate timings */

        /* 1 * DDR_CLK = 2 * UI */

        /* min 40ns + 4*UI      max 85ns + 6*UI */
        ths_prepare = ns2ddr(dsidev, 70) + 2;

        /* min 145ns + 10*UI */
        ths_prepare_ths_zero = ns2ddr(dsidev, 175) + 2;

        /* min max(8*UI, 60ns+4*UI) */
        ths_trail = ns2ddr(dsidev, 60) + 5;

        /* min 100ns */
        ths_exit = ns2ddr(dsidev, 145);

        /* tlpx min 50n */
        tlpx_half = ns2ddr(dsidev, 25);

        /* min 60ns */
        tclk_trail = ns2ddr(dsidev, 60) + 2;

        /* min 38ns, max 95ns */
        tclk_prepare = ns2ddr(dsidev, 65);

        /* min tclk-prepare + tclk-zero = 300ns */
        tclk_zero = ns2ddr(dsidev, 260);

        DSSDBG("ths_prepare %u (%uns), ths_prepare_ths_zero %u (%uns)\n",
                ths_prepare, ddr2ns(dsidev, ths_prepare),
                ths_prepare_ths_zero, ddr2ns(dsidev, ths_prepare_ths_zero));
        DSSDBG("ths_trail %u (%uns), ths_exit %u (%uns)\n",
                        ths_trail, ddr2ns(dsidev, ths_trail),
                        ths_exit, ddr2ns(dsidev, ths_exit));

        DSSDBG("tlpx_half %u (%uns), tclk_trail %u (%uns), "
                        "tclk_zero %u (%uns)\n",
                        tlpx_half, ddr2ns(dsidev, tlpx_half),
                        tclk_trail, ddr2ns(dsidev, tclk_trail),
                        tclk_zero, ddr2ns(dsidev, tclk_zero));
        DSSDBG("tclk_prepare %u (%uns)\n",
                        tclk_prepare, ddr2ns(dsidev, tclk_prepare));

        /* program timings */

        r = dsi_read_reg(dsidev, DSI_DSIPHY_CFG0);
        r = FLD_MOD(r, ths_prepare, 31, 24);
        r = FLD_MOD(r, ths_prepare_ths_zero, 23, 16);
        r = FLD_MOD(r, ths_trail, 15, 8);
        r = FLD_MOD(r, ths_exit, 7, 0);
        dsi_write_reg(dsidev, DSI_DSIPHY_CFG0, r);

        r = dsi_read_reg(dsidev, DSI_DSIPHY_CFG1);
        r = FLD_MOD(r, tlpx_half, 20, 16);
        r = FLD_MOD(r, tclk_trail, 15, 8);
        r = FLD_MOD(r, tclk_zero, 7, 0);

        if (dss_has_feature(FEAT_DSI_PHY_DCC)) {
                r = FLD_MOD(r, 0, 21, 21);      /* DCCEN = disable */
                r = FLD_MOD(r, 1, 22, 22);      /* CLKINP_DIVBY2EN = enable */
                r = FLD_MOD(r, 1, 23, 23);      /* CLKINP_SEL = enable */
        }

        dsi_write_reg(dsidev, DSI_DSIPHY_CFG1, r);

        r = dsi_read_reg(dsidev, DSI_DSIPHY_CFG2);
        r = FLD_MOD(r, tclk_prepare, 7, 0);
        dsi_write_reg(dsidev, DSI_DSIPHY_CFG2, r);
}

/* lane masks have lane 0 at lsb. mask_p for positive lines, n for negative */
static void dsi_cio_enable_lane_override(struct platform_device *dsidev,
                unsigned mask_p, unsigned mask_n)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int i;
        u32 l;
        u8 lptxscp_start = dsi->num_lanes_supported == 3 ? 22 : 26;

        l = 0;

        for (i = 0; i < dsi->num_lanes_supported; ++i) {
                unsigned p = dsi->lanes[i].polarity;

                if (mask_p & (1 << i))
                        l |= 1 << (i * 2 + (p ? 0 : 1));

                if (mask_n & (1 << i))
                        l |= 1 << (i * 2 + (p ? 1 : 0));
        }

        /*
         * Bits in REGLPTXSCPDAT4TO0DXDY:
         * 17: DY0 18: DX0
         * 19: DY1 20: DX1
         * 21: DY2 22: DX2
         * 23: DY3 24: DX3
         * 25: DY4 26: DX4
         */

        /* Set the lane override configuration */

        /* REGLPTXSCPDAT4TO0DXDY */
        REG_FLD_MOD(dsidev, DSI_DSIPHY_CFG10, l, lptxscp_start, 17);

        /* Enable lane override */

        /* ENLPTXSCPDAT */
        REG_FLD_MOD(dsidev, DSI_DSIPHY_CFG10, 1, 27, 27);
}

static void dsi_cio_disable_lane_override(struct platform_device *dsidev)
{
        /* Disable lane override */
        REG_FLD_MOD(dsidev, DSI_DSIPHY_CFG10, 0, 27, 27); /* ENLPTXSCPDAT */
        /* Reset the lane override configuration */
        /* REGLPTXSCPDAT4TO0DXDY */
        REG_FLD_MOD(dsidev, DSI_DSIPHY_CFG10, 0, 22, 17);
}

static int dsi_cio_wait_tx_clk_esc_reset(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int t, i;
        bool in_use[DSI_MAX_NR_LANES];
        static const u8 offsets_old[] = { 28, 27, 26 };
        static const u8 offsets_new[] = { 24, 25, 26, 27, 28 };
        const u8 *offsets;

        if (dss_has_feature(FEAT_DSI_REVERSE_TXCLKESC))
                offsets = offsets_old;
        else
                offsets = offsets_new;

        for (i = 0; i < dsi->num_lanes_supported; ++i)
                in_use[i] = dsi->lanes[i].function != DSI_LANE_UNUSED;

        t = 100000;
        while (true) {
                u32 l;
                int ok;

                l = dsi_read_reg(dsidev, DSI_DSIPHY_CFG5);

                ok = 0;
                for (i = 0; i < dsi->num_lanes_supported; ++i) {
                        if (!in_use[i] || (l & (1 << offsets[i])))
                                ok++;
                }

                if (ok == dsi->num_lanes_supported)
                        break;

                if (--t == 0) {
                        for (i = 0; i < dsi->num_lanes_supported; ++i) {
                                if (!in_use[i] || (l & (1 << offsets[i])))
                                        continue;

                                DSSERR("CIO TXCLKESC%d domain not coming " \
                                                "out of reset\n", i);
                        }
                        return -EIO;
                }
        }

        return 0;
}

/* return bitmask of enabled lanes, lane0 being the lsb */
static unsigned dsi_get_lane_mask(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        unsigned mask = 0;
        int i;

        for (i = 0; i < dsi->num_lanes_supported; ++i) {
                if (dsi->lanes[i].function != DSI_LANE_UNUSED)
                        mask |= 1 << i;
        }

        return mask;
}

static int dsi_cio_init(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int r;
        u32 l;

        DSSDBG("DSI CIO init starts");

        r = dss_dsi_enable_pads(dsi->module_id, dsi_get_lane_mask(dsidev));
        if (r)
                return r;

        dsi_enable_scp_clk(dsidev);

        /* A dummy read using the SCP interface to any DSIPHY register is
         * required after DSIPHY reset to complete the reset of the DSI complex
         * I/O. */
        dsi_read_reg(dsidev, DSI_DSIPHY_CFG5);

        if (wait_for_bit_change(dsidev, DSI_DSIPHY_CFG5, 30, 1) != 1) {
                DSSERR("CIO SCP Clock domain not coming out of reset.\n");
                r = -EIO;
                goto err_scp_clk_dom;
        }

        r = dsi_set_lane_config(dsidev);
        if (r)
                goto err_scp_clk_dom;

        /* set TX STOP MODE timer to maximum for this operation */
        l = dsi_read_reg(dsidev, DSI_TIMING1);
        l = FLD_MOD(l, 1, 15, 15);      /* FORCE_TX_STOP_MODE_IO */
        l = FLD_MOD(l, 1, 14, 14);      /* STOP_STATE_X16_IO */
        l = FLD_MOD(l, 1, 13, 13);      /* STOP_STATE_X4_IO */
        l = FLD_MOD(l, 0x1fff, 12, 0);  /* STOP_STATE_COUNTER_IO */
        dsi_write_reg(dsidev, DSI_TIMING1, l);

        if (dsi->ulps_enabled) {
                unsigned mask_p;
                int i;

                DSSDBG("manual ulps exit\n");

                /* ULPS is exited by Mark-1 state for 1ms, followed by
                 * stop state. DSS HW cannot do this via the normal
                 * ULPS exit sequence, as after reset the DSS HW thinks
                 * that we are not in ULPS mode, and refuses to send the
                 * sequence. So we need to send the ULPS exit sequence
                 * manually by setting positive lines high and negative lines
                 * low for 1ms.
                 */

                mask_p = 0;

                for (i = 0; i < dsi->num_lanes_supported; ++i) {
                        if (dsi->lanes[i].function == DSI_LANE_UNUSED)
                                continue;
                        mask_p |= 1 << i;
                }

                dsi_cio_enable_lane_override(dsidev, mask_p, 0);
        }

        r = dsi_cio_power(dsidev, DSI_COMPLEXIO_POWER_ON);
        if (r)
                goto err_cio_pwr;

        if (wait_for_bit_change(dsidev, DSI_COMPLEXIO_CFG1, 29, 1) != 1) {
                DSSERR("CIO PWR clock domain not coming out of reset.\n");
                r = -ENODEV;
                goto err_cio_pwr_dom;
        }

        dsi_if_enable(dsidev, true);
        dsi_if_enable(dsidev, false);
        REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 1, 20, 20); /* LP_CLK_ENABLE */

        r = dsi_cio_wait_tx_clk_esc_reset(dsidev);
        if (r)
                goto err_tx_clk_esc_rst;

        if (dsi->ulps_enabled) {
                /* Keep Mark-1 state for 1ms (as per DSI spec) */
                ktime_t wait = ns_to_ktime(1000 * 1000);
                set_current_state(TASK_UNINTERRUPTIBLE);
                schedule_hrtimeout(&wait, HRTIMER_MODE_REL);

                /* Disable the override. The lanes should be set to Mark-11
                 * state by the HW */
                dsi_cio_disable_lane_override(dsidev);
        }

        /* FORCE_TX_STOP_MODE_IO */
        REG_FLD_MOD(dsidev, DSI_TIMING1, 0, 15, 15);

        dsi_cio_timings(dsidev);

        if (dsi->mode == OMAP_DSS_DSI_VIDEO_MODE) {
                /* DDR_CLK_ALWAYS_ON */
                REG_FLD_MOD(dsidev, DSI_CLK_CTRL,
                        dsi->vm_timings.ddr_clk_always_on, 13, 13);
        }

        dsi->ulps_enabled = false;

        DSSDBG("CIO init done\n");

        return 0;

err_tx_clk_esc_rst:
        REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 0, 20, 20); /* LP_CLK_ENABLE */
err_cio_pwr_dom:
        dsi_cio_power(dsidev, DSI_COMPLEXIO_POWER_OFF);
err_cio_pwr:
        if (dsi->ulps_enabled)
                dsi_cio_disable_lane_override(dsidev);
err_scp_clk_dom:
        dsi_disable_scp_clk(dsidev);
        dss_dsi_disable_pads(dsi->module_id, dsi_get_lane_mask(dsidev));
        return r;
}

static void dsi_cio_uninit(struct platform_device *dsidev)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        /* DDR_CLK_ALWAYS_ON */
        REG_FLD_MOD(dsidev, DSI_CLK_CTRL, 0, 13, 13);

        dsi_cio_power(dsidev, DSI_COMPLEXIO_POWER_OFF);
        dsi_disable_scp_clk(dsidev);
        dss_dsi_disable_pads(dsi->module_id, dsi_get_lane_mask(dsidev));
}

static void dsi_config_tx_fifo(struct platform_device *dsidev,
                enum fifo_size size1, enum fifo_size size2,
                enum fifo_size size3, enum fifo_size size4)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u32 r = 0;
        int add = 0;
        int i;

        dsi->vc[0].tx_fifo_size = size1;
        dsi->vc[1].tx_fifo_size = size2;
        dsi->vc[2].tx_fifo_size = size3;
        dsi->vc[3].tx_fifo_size = size4;

        for (i = 0; i < 4; i++) {
                u8 v;
                int size = dsi->vc[i].tx_fifo_size;

                if (add + size > 4) {
                        DSSERR("Illegal FIFO configuration\n");
                        BUG();
                        return;
                }

                v = FLD_VAL(add, 2, 0) | FLD_VAL(size, 7, 4);
                r |= v << (8 * i);
                /*DSSDBG("TX FIFO vc %d: size %d, add %d\n", i, size, add); */
                add += size;
        }

        dsi_write_reg(dsidev, DSI_TX_FIFO_VC_SIZE, r);
}

static void dsi_config_rx_fifo(struct platform_device *dsidev,
                enum fifo_size size1, enum fifo_size size2,
                enum fifo_size size3, enum fifo_size size4)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u32 r = 0;
        int add = 0;
        int i;

        dsi->vc[0].rx_fifo_size = size1;
        dsi->vc[1].rx_fifo_size = size2;
        dsi->vc[2].rx_fifo_size = size3;
        dsi->vc[3].rx_fifo_size = size4;

        for (i = 0; i < 4; i++) {
                u8 v;
                int size = dsi->vc[i].rx_fifo_size;

                if (add + size > 4) {
                        DSSERR("Illegal FIFO configuration\n");
                        BUG();
                        return;
                }

                v = FLD_VAL(add, 2, 0) | FLD_VAL(size, 7, 4);
                r |= v << (8 * i);
                /*DSSDBG("RX FIFO vc %d: size %d, add %d\n", i, size, add); */
                add += size;
        }

        dsi_write_reg(dsidev, DSI_RX_FIFO_VC_SIZE, r);
}

static int dsi_force_tx_stop_mode_io(struct platform_device *dsidev)
{
        u32 r;

        r = dsi_read_reg(dsidev, DSI_TIMING1);
        r = FLD_MOD(r, 1, 15, 15);      /* FORCE_TX_STOP_MODE_IO */
        dsi_write_reg(dsidev, DSI_TIMING1, r);

        if (wait_for_bit_change(dsidev, DSI_TIMING1, 15, 0) != 0) {
                DSSERR("TX_STOP bit not going down\n");
                return -EIO;
        }

        return 0;
}

static bool dsi_vc_is_enabled(struct platform_device *dsidev, int channel)
{
        return REG_GET(dsidev, DSI_VC_CTRL(channel), 0, 0);
}

static void dsi_packet_sent_handler_vp(void *data, u32 mask)
{
        struct dsi_packet_sent_handler_data *vp_data =
                (struct dsi_packet_sent_handler_data *) data;
        struct dsi_data *dsi = dsi_get_dsidrv_data(vp_data->dsidev);
        const int channel = dsi->update_channel;
        u8 bit = dsi->te_enabled ? 30 : 31;

        if (REG_GET(vp_data->dsidev, DSI_VC_TE(channel), bit, bit) == 0)
                complete(vp_data->completion);
}

static int dsi_sync_vc_vp(struct platform_device *dsidev, int channel)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        DECLARE_COMPLETION_ONSTACK(completion);
        struct dsi_packet_sent_handler_data vp_data = {
                .dsidev = dsidev,
                .completion = &completion
        };
        int r = 0;
        u8 bit;

        bit = dsi->te_enabled ? 30 : 31;

        r = dsi_register_isr_vc(dsidev, channel, dsi_packet_sent_handler_vp,
                &vp_data, DSI_VC_IRQ_PACKET_SENT);
        if (r)
                goto err0;

        /* Wait for completion only if TE_EN/TE_START is still set */
        if (REG_GET(dsidev, DSI_VC_TE(channel), bit, bit)) {
                if (wait_for_completion_timeout(&completion,
                                msecs_to_jiffies(10)) == 0) {
                        DSSERR("Failed to complete previous frame transfer\n");
                        r = -EIO;
                        goto err1;
                }
        }

        dsi_unregister_isr_vc(dsidev, channel, dsi_packet_sent_handler_vp,
                &vp_data, DSI_VC_IRQ_PACKET_SENT);

        return 0;
err1:
        dsi_unregister_isr_vc(dsidev, channel, dsi_packet_sent_handler_vp,
                &vp_data, DSI_VC_IRQ_PACKET_SENT);
err0:
        return r;
}

static void dsi_packet_sent_handler_l4(void *data, u32 mask)
{
        struct dsi_packet_sent_handler_data *l4_data =
                (struct dsi_packet_sent_handler_data *) data;
        struct dsi_data *dsi = dsi_get_dsidrv_data(l4_data->dsidev);
        const int channel = dsi->update_channel;

        if (REG_GET(l4_data->dsidev, DSI_VC_CTRL(channel), 5, 5) == 0)
                complete(l4_data->completion);
}

static int dsi_sync_vc_l4(struct platform_device *dsidev, int channel)
{
        DECLARE_COMPLETION_ONSTACK(completion);
        struct dsi_packet_sent_handler_data l4_data = {
                .dsidev = dsidev,
                .completion = &completion
        };
        int r = 0;

        r = dsi_register_isr_vc(dsidev, channel, dsi_packet_sent_handler_l4,
                &l4_data, DSI_VC_IRQ_PACKET_SENT);
        if (r)
                goto err0;

        /* Wait for completion only if TX_FIFO_NOT_EMPTY is still set */
        if (REG_GET(dsidev, DSI_VC_CTRL(channel), 5, 5)) {
                if (wait_for_completion_timeout(&completion,
                                msecs_to_jiffies(10)) == 0) {
                        DSSERR("Failed to complete previous l4 transfer\n");
                        r = -EIO;
                        goto err1;
                }
        }

        dsi_unregister_isr_vc(dsidev, channel, dsi_packet_sent_handler_l4,
                &l4_data, DSI_VC_IRQ_PACKET_SENT);

        return 0;
err1:
        dsi_unregister_isr_vc(dsidev, channel, dsi_packet_sent_handler_l4,
                &l4_data, DSI_VC_IRQ_PACKET_SENT);
err0:
        return r;
}

static int dsi_sync_vc(struct platform_device *dsidev, int channel)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        WARN_ON(!dsi_bus_is_locked(dsidev));

        WARN_ON(in_interrupt());

        if (!dsi_vc_is_enabled(dsidev, channel))
                return 0;

        switch (dsi->vc[channel].source) {
        case DSI_VC_SOURCE_VP:
                return dsi_sync_vc_vp(dsidev, channel);
        case DSI_VC_SOURCE_L4:
                return dsi_sync_vc_l4(dsidev, channel);
        default:
                BUG();
                return -EINVAL;
        }
}

static int dsi_vc_enable(struct platform_device *dsidev, int channel,
                bool enable)
{
        DSSDBG("dsi_vc_enable channel %d, enable %d\n",
                        channel, enable);

        enable = enable ? 1 : 0;

        REG_FLD_MOD(dsidev, DSI_VC_CTRL(channel), enable, 0, 0);

        if (wait_for_bit_change(dsidev, DSI_VC_CTRL(channel),
                0, enable) != enable) {
                        DSSERR("Failed to set dsi_vc_enable to %d\n", enable);
                        return -EIO;
        }

        return 0;
}

static void dsi_vc_initial_config(struct platform_device *dsidev, int channel)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u32 r;

        DSSDBG("Initial config of virtual channel %d", channel);

        r = dsi_read_reg(dsidev, DSI_VC_CTRL(channel));

        if (FLD_GET(r, 15, 15)) /* VC_BUSY */
                DSSERR("VC(%d) busy when trying to configure it!\n",
                                channel);

        r = FLD_MOD(r, 0, 1, 1); /* SOURCE, 0 = L4 */
        r = FLD_MOD(r, 0, 2, 2); /* BTA_SHORT_EN  */
        r = FLD_MOD(r, 0, 3, 3); /* BTA_LONG_EN */
        r = FLD_MOD(r, 0, 4, 4); /* MODE, 0 = command */
        r = FLD_MOD(r, 1, 7, 7); /* CS_TX_EN */
        r = FLD_MOD(r, 1, 8, 8); /* ECC_TX_EN */
        r = FLD_MOD(r, 0, 9, 9); /* MODE_SPEED, high speed on/off */
        if (dss_has_feature(FEAT_DSI_VC_OCP_WIDTH))
                r = FLD_MOD(r, 3, 11, 10);      /* OCP_WIDTH = 32 bit */

        r = FLD_MOD(r, 4, 29, 27); /* DMA_RX_REQ_NB = no dma */
        r = FLD_MOD(r, 4, 23, 21); /* DMA_TX_REQ_NB = no dma */

        dsi_write_reg(dsidev, DSI_VC_CTRL(channel), r);

        dsi->vc[channel].source = DSI_VC_SOURCE_L4;
}

static int dsi_vc_config_source(struct platform_device *dsidev, int channel,
                enum dsi_vc_source source)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        if (dsi->vc[channel].source == source)
                return 0;

        DSSDBG("Source config of virtual channel %d", channel);

        dsi_sync_vc(dsidev, channel);

        dsi_vc_enable(dsidev, channel, 0);

        /* VC_BUSY */
        if (wait_for_bit_change(dsidev, DSI_VC_CTRL(channel), 15, 0) != 0) {
                DSSERR("vc(%d) busy when trying to config for VP\n", channel);
                return -EIO;
        }

        /* SOURCE, 0 = L4, 1 = video port */
        REG_FLD_MOD(dsidev, DSI_VC_CTRL(channel), source, 1, 1);

        /* DCS_CMD_ENABLE */
        if (dss_has_feature(FEAT_DSI_DCS_CMD_CONFIG_VC)) {
                bool enable = source == DSI_VC_SOURCE_VP;
                REG_FLD_MOD(dsidev, DSI_VC_CTRL(channel), enable, 30, 30);
        }

        dsi_vc_enable(dsidev, channel, 1);

        dsi->vc[channel].source = source;

        return 0;
}

static void dsi_vc_enable_hs(struct omap_dss_device *dssdev, int channel,
                bool enable)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        DSSDBG("dsi_vc_enable_hs(%d, %d)\n", channel, enable);

        WARN_ON(!dsi_bus_is_locked(dsidev));

        dsi_vc_enable(dsidev, channel, 0);
        dsi_if_enable(dsidev, 0);

        REG_FLD_MOD(dsidev, DSI_VC_CTRL(channel), enable, 9, 9);

        dsi_vc_enable(dsidev, channel, 1);
        dsi_if_enable(dsidev, 1);

        dsi_force_tx_stop_mode_io(dsidev);

        /* start the DDR clock by sending a NULL packet */
        if (dsi->vm_timings.ddr_clk_always_on && enable)
                dsi_vc_send_null(dssdev, channel);
}

static void dsi_vc_flush_long_data(struct platform_device *dsidev, int channel)
{
        while (REG_GET(dsidev, DSI_VC_CTRL(channel), 20, 20)) {
                u32 val;
                val = dsi_read_reg(dsidev, DSI_VC_SHORT_PACKET_HEADER(channel));
                DSSDBG("\t\tb1 %#02x b2 %#02x b3 %#02x b4 %#02x\n",
                                (val >> 0) & 0xff,
                                (val >> 8) & 0xff,
                                (val >> 16) & 0xff,
                                (val >> 24) & 0xff);
        }
}

static void dsi_show_rx_ack_with_err(u16 err)
{
        DSSERR("\tACK with ERROR (%#x):\n", err);
        if (err & (1 << 0))
                DSSERR("\t\tSoT Error\n");
        if (err & (1 << 1))
                DSSERR("\t\tSoT Sync Error\n");
        if (err & (1 << 2))
                DSSERR("\t\tEoT Sync Error\n");
        if (err & (1 << 3))
                DSSERR("\t\tEscape Mode Entry Command Error\n");
        if (err & (1 << 4))
                DSSERR("\t\tLP Transmit Sync Error\n");
        if (err & (1 << 5))
                DSSERR("\t\tHS Receive Timeout Error\n");
        if (err & (1 << 6))
                DSSERR("\t\tFalse Control Error\n");
        if (err & (1 << 7))
                DSSERR("\t\t(reserved7)\n");
        if (err & (1 << 8))
                DSSERR("\t\tECC Error, single-bit (corrected)\n");
        if (err & (1 << 9))
                DSSERR("\t\tECC Error, multi-bit (not corrected)\n");
        if (err & (1 << 10))
                DSSERR("\t\tChecksum Error\n");
        if (err & (1 << 11))
                DSSERR("\t\tData type not recognized\n");
        if (err & (1 << 12))
                DSSERR("\t\tInvalid VC ID\n");
        if (err & (1 << 13))
                DSSERR("\t\tInvalid Transmission Length\n");
        if (err & (1 << 14))
                DSSERR("\t\t(reserved14)\n");
        if (err & (1 << 15))
                DSSERR("\t\tDSI Protocol Violation\n");
}

static u16 dsi_vc_flush_receive_data(struct platform_device *dsidev,
                int channel)
{
        /* RX_FIFO_NOT_EMPTY */
        while (REG_GET(dsidev, DSI_VC_CTRL(channel), 20, 20)) {
                u32 val;
                u8 dt;
                val = dsi_read_reg(dsidev, DSI_VC_SHORT_PACKET_HEADER(channel));
                DSSERR("\trawval %#08x\n", val);
                dt = FLD_GET(val, 5, 0);
                if (dt == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT) {
                        u16 err = FLD_GET(val, 23, 8);
                        dsi_show_rx_ack_with_err(err);
                } else if (dt == MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE) {
                        DSSERR("\tDCS short response, 1 byte: %#x\n",
                                        FLD_GET(val, 23, 8));
                } else if (dt == MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE) {
                        DSSERR("\tDCS short response, 2 byte: %#x\n",
                                        FLD_GET(val, 23, 8));
                } else if (dt == MIPI_DSI_RX_DCS_LONG_READ_RESPONSE) {
                        DSSERR("\tDCS long response, len %d\n",
                                        FLD_GET(val, 23, 8));
                        dsi_vc_flush_long_data(dsidev, channel);
                } else {
                        DSSERR("\tunknown datatype 0x%02x\n", dt);
                }
        }
        return 0;
}

static int dsi_vc_send_bta(struct platform_device *dsidev, int channel)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);

        if (dsi->debug_write || dsi->debug_read)
                DSSDBG("dsi_vc_send_bta %d\n", channel);

        WARN_ON(!dsi_bus_is_locked(dsidev));

        /* RX_FIFO_NOT_EMPTY */
        if (REG_GET(dsidev, DSI_VC_CTRL(channel), 20, 20)) {
                DSSERR("rx fifo not empty when sending BTA, dumping data:\n");
                dsi_vc_flush_receive_data(dsidev, channel);
        }

        REG_FLD_MOD(dsidev, DSI_VC_CTRL(channel), 1, 6, 6); /* BTA_EN */

        /* flush posted write */
        dsi_read_reg(dsidev, DSI_VC_CTRL(channel));

        return 0;
}

static int dsi_vc_send_bta_sync(struct omap_dss_device *dssdev, int channel)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
        DECLARE_COMPLETION_ONSTACK(completion);
        int r = 0;
        u32 err;

        r = dsi_register_isr_vc(dsidev, channel, dsi_completion_handler,
                        &completion, DSI_VC_IRQ_BTA);
        if (r)
                goto err0;

        r = dsi_register_isr(dsidev, dsi_completion_handler, &completion,
                        DSI_IRQ_ERROR_MASK);
        if (r)
                goto err1;

        r = dsi_vc_send_bta(dsidev, channel);
        if (r)
                goto err2;

        if (wait_for_completion_timeout(&completion,
                                msecs_to_jiffies(500)) == 0) {
                DSSERR("Failed to receive BTA\n");
                r = -EIO;
                goto err2;
        }

        err = dsi_get_errors(dsidev);
        if (err) {
                DSSERR("Error while sending BTA: %x\n", err);
                r = -EIO;
                goto err2;
        }
err2:
        dsi_unregister_isr(dsidev, dsi_completion_handler, &completion,
                        DSI_IRQ_ERROR_MASK);
err1:
        dsi_unregister_isr_vc(dsidev, channel, dsi_completion_handler,
                        &completion, DSI_VC_IRQ_BTA);
err0:
        return r;
}

static inline void dsi_vc_write_long_header(struct platform_device *dsidev,
                int channel, u8 data_type, u16 len, u8 ecc)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u32 val;
        u8 data_id;

        WARN_ON(!dsi_bus_is_locked(dsidev));

        data_id = data_type | dsi->vc[channel].vc_id << 6;

        val = FLD_VAL(data_id, 7, 0) | FLD_VAL(len, 23, 8) |
                FLD_VAL(ecc, 31, 24);

        dsi_write_reg(dsidev, DSI_VC_LONG_PACKET_HEADER(channel), val);
}

static inline void dsi_vc_write_long_payload(struct platform_device *dsidev,
                int channel, u8 b1, u8 b2, u8 b3, u8 b4)
{
        u32 val;

        val = b4 << 24 | b3 << 16 | b2 << 8  | b1 << 0;

/*      DSSDBG("\twriting %02x, %02x, %02x, %02x (%#010x)\n",
                        b1, b2, b3, b4, val); */

        dsi_write_reg(dsidev, DSI_VC_LONG_PACKET_PAYLOAD(channel), val);
}

static int dsi_vc_send_long(struct platform_device *dsidev, int channel,
                u8 data_type, u8 *data, u16 len, u8 ecc)
{
        /*u32 val; */
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int i;
        u8 *p;
        int r = 0;
        u8 b1, b2, b3, b4;

        if (dsi->debug_write)
                DSSDBG("dsi_vc_send_long, %d bytes\n", len);

        /* len + header */
        if (dsi->vc[channel].tx_fifo_size * 32 * 4 < len + 4) {
                DSSERR("unable to send long packet: packet too long.\n");
                return -EINVAL;
        }

        dsi_vc_config_source(dsidev, channel, DSI_VC_SOURCE_L4);

        dsi_vc_write_long_header(dsidev, channel, data_type, len, ecc);

        p = data;
        for (i = 0; i < len >> 2; i++) {
                if (dsi->debug_write)
                        DSSDBG("\tsending full packet %d\n", i);

                b1 = *p++;
                b2 = *p++;
                b3 = *p++;
                b4 = *p++;

                dsi_vc_write_long_payload(dsidev, channel, b1, b2, b3, b4);
        }

        i = len % 4;
        if (i) {
                b1 = 0; b2 = 0; b3 = 0;

                if (dsi->debug_write)
                        DSSDBG("\tsending remainder bytes %d\n", i);

                switch (i) {
                case 3:
                        b1 = *p++;
                        b2 = *p++;
                        b3 = *p++;
                        break;
                case 2:
                        b1 = *p++;
                        b2 = *p++;
                        break;
                case 1:
                        b1 = *p++;
                        break;
                }

                dsi_vc_write_long_payload(dsidev, channel, b1, b2, b3, 0);
        }

        return r;
}

static int dsi_vc_send_short(struct platform_device *dsidev, int channel,
                u8 data_type, u16 data, u8 ecc)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u32 r;
        u8 data_id;

        WARN_ON(!dsi_bus_is_locked(dsidev));

        if (dsi->debug_write)
                DSSDBG("dsi_vc_send_short(ch%d, dt %#x, b1 %#x, b2 %#x)\n",
                                channel,
                                data_type, data & 0xff, (data >> 8) & 0xff);

        dsi_vc_config_source(dsidev, channel, DSI_VC_SOURCE_L4);

        if (FLD_GET(dsi_read_reg(dsidev, DSI_VC_CTRL(channel)), 16, 16)) {
                DSSERR("ERROR FIFO FULL, aborting transfer\n");
                return -EINVAL;
        }

        data_id = data_type | dsi->vc[channel].vc_id << 6;

        r = (data_id << 0) | (data << 8) | (ecc << 24);

        dsi_write_reg(dsidev, DSI_VC_SHORT_PACKET_HEADER(channel), r);

        return 0;
}

static int dsi_vc_send_null(struct omap_dss_device *dssdev, int channel)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);

        return dsi_vc_send_long(dsidev, channel, MIPI_DSI_NULL_PACKET, NULL,
                0, 0);
}

static int dsi_vc_write_nosync_common(struct platform_device *dsidev,
                int channel, u8 *data, int len, enum dss_dsi_content_type type)
{
        int r;

        if (len == 0) {
                BUG_ON(type == DSS_DSI_CONTENT_DCS);
                r = dsi_vc_send_short(dsidev, channel,
                                MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM, 0, 0);
        } else if (len == 1) {
                r = dsi_vc_send_short(dsidev, channel,
                                type == DSS_DSI_CONTENT_GENERIC ?
                                MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM :
                                MIPI_DSI_DCS_SHORT_WRITE, data[0], 0);
        } else if (len == 2) {
                r = dsi_vc_send_short(dsidev, channel,
                                type == DSS_DSI_CONTENT_GENERIC ?
                                MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM :
                                MIPI_DSI_DCS_SHORT_WRITE_PARAM,
                                data[0] | (data[1] << 8), 0);
        } else {
                r = dsi_vc_send_long(dsidev, channel,
                                type == DSS_DSI_CONTENT_GENERIC ?
                                MIPI_DSI_GENERIC_LONG_WRITE :
                                MIPI_DSI_DCS_LONG_WRITE, data, len, 0);
        }

        return r;
}

static int dsi_vc_dcs_write_nosync(struct omap_dss_device *dssdev, int channel,
                u8 *data, int len)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);

        return dsi_vc_write_nosync_common(dsidev, channel, data, len,
                        DSS_DSI_CONTENT_DCS);
}

static int dsi_vc_generic_write_nosync(struct omap_dss_device *dssdev, int channel,
                u8 *data, int len)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);

        return dsi_vc_write_nosync_common(dsidev, channel, data, len,
                        DSS_DSI_CONTENT_GENERIC);
}

static int dsi_vc_write_common(struct omap_dss_device *dssdev, int channel,
                u8 *data, int len, enum dss_dsi_content_type type)
{
        struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
        int r;

        r = dsi_vc_write_nosync_common(dsidev, channel, data, len, type);
        if (r)
                goto err;

        r = dsi_vc_send_bta_sync(dssdev, channel);
        if (r)
                goto err;

        /* RX_FIFO_NOT_EMPTY */
        if (REG_GET(dsidev, DSI_VC_CTRL(channel), 20, 20)) {
                DSSERR("rx fifo not empty after write, dumping data:\n");
                dsi_vc_flush_receive_data(dsidev, channel);
                r = -EIO;
                goto err;
        }

        return 0;
err:
        DSSERR("dsi_vc_write_common(ch %d, cmd 0x%02x, len %d) failed\n",
                        channel, data[0], len);
        return r;
}

static int dsi_vc_dcs_write(struct omap_dss_device *dssdev, int channel, u8 *data,
                int len)
{
        return dsi_vc_write_common(dssdev, channel, data, len,
                        DSS_DSI_CONTENT_DCS);
}

static int dsi_vc_generic_write(struct omap_dss_device *dssdev, int channel, u8 *data,
                int len)
{
        return dsi_vc_write_common(dssdev, channel, data, len,
                        DSS_DSI_CONTENT_GENERIC);
}

static int dsi_vc_dcs_send_read_request(struct platform_device *dsidev,
                int channel, u8 dcs_cmd)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        int r;

        if (dsi->debug_read)
                DSSDBG("dsi_vc_dcs_send_read_request(ch%d, dcs_cmd %x)\n",
                        channel, dcs_cmd);

        r = dsi_vc_send_short(dsidev, channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
        if (r) {
                DSSERR("dsi_vc_dcs_send_read_request(ch %d, cmd 0x%02x)"
                        " failed\n", channel, dcs_cmd);
                return r;
        }

        return 0;
}

static int dsi_vc_generic_send_read_request(struct platform_device *dsidev,
                int channel, u8 *reqdata, int reqlen)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u16 data;
        u8 data_type;
        int r;

        if (dsi->debug_read)
                DSSDBG("dsi_vc_generic_send_read_request(ch %d, reqlen %d)\n",
                        channel, reqlen);

        if (reqlen == 0) {
                data_type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
                data = 0;
        } else if (reqlen == 1) {
                data_type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
                data = reqdata[0];
        } else if (reqlen == 2) {
                data_type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
                data = reqdata[0] | (reqdata[1] << 8);
        } else {
                BUG();
                return -EINVAL;
        }

        r = dsi_vc_send_short(dsidev, channel, data_type, data, 0);
        if (r) {
                DSSERR("dsi_vc_generic_send_read_request(ch %d, reqlen %d)"
                        " failed\n", channel, reqlen);
                return r;
        }

        return 0;
}

static int dsi_vc_read_rx_fifo(struct platform_device *dsidev, int channel,
                u8 *buf, int buflen, enum dss_dsi_content_type type)
{
        struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
        u32 val;
        u8 dt;
        int r;

        /* RX_FIFO_NOT_EMPTY */
        if (REG_GET(dsidev, DSI_VC_CTRL(channel), 20, 20) == 0) {
                DSSERR("RX fifo empty when trying to read.\n");
                r = -EIO;
                goto err;
        }

        val = dsi_read_reg(dsidev, DSI_VC_SHORT_PACKET_HEADER(channel));
        if (dsi->debug_read)
                DSSDBG("\theader: %08x\n", val);
        dt = FLD_GET(val, 5, 0);
        if (dt == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT) {
                u16 err = FLD_GET(val, 23, 8);
                dsi_show_rx_ack_with_err(err);
                r = -EIO;
                goto err;

        } else if (dt == (type == DSS_DSI_CONTENT_GENERIC ?
                        MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE :
                        MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE)) {
                u8 data = FLD_GET(val, 15, 8);
                if (dsi->debug_read)
                        DSSDBG("\t%s short response, 1 byte: %02x\n",
                                type == DSS_DSI_CONTENT_GENERIC ? "GENERIC" :
                                "DCS", data);

                if (buflen < 1) {
                        r = -EIO;
                        goto err;
                }

                buf[0] = data;

                return 1;
        } else if (dt == (type == DSS_DSI_CONTENT_GENERIC ?
                        MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE :
                        MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE)) {
                u16 data = FLD_GET(val, 23, 8);
                if (dsi->debug_read)
                        DSSDBG("\t%s short response, 2 byte: %04x\n",
                                type == DSS_DSI_CONTENT_GENERIC ? "GENERIC" :
                                "DCS", data);

                if (buflen < 2) {
                        r = -EIO;
                        goto err;
                }

                buf[0] = data & 0xff;
                buf[1] = (data >> 8) & 0xff;

                return 2;