/*
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <robdclark@gmail.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/>.
 */

#include <linux/component.h>
#include <linux/hdmi.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <sound/asoundef.h>
#include <sound/hdmi-codec.h>

#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_of.h>
#include <drm/i2c/tda998x.h>

#define DBG(fmt, ...) DRM_DEBUG(fmt"\n", ##__VA_ARGS__)

struct tda998x_audio_port {
        u8 format;              /* AFMT_xxx */
        u8 config;              /* AP value */
};

struct tda998x_priv {
        struct i2c_client *cec;
        struct i2c_client *hdmi;
        struct mutex mutex;
        u16 rev;
        u8 cec_addr;
        u8 current_page;
        bool is_on;
        bool supports_infoframes;
        bool sink_has_audio;
        u8 vip_cntrl_0;
        u8 vip_cntrl_1;
        u8 vip_cntrl_2;
        unsigned long tmds_clock;
        struct tda998x_audio_params audio_params;

        struct platform_device *audio_pdev;
        struct mutex audio_mutex;

        wait_queue_head_t wq_edid;
        volatile int wq_edid_wait;

        struct work_struct detect_work;
        struct timer_list edid_delay_timer;
        wait_queue_head_t edid_delay_waitq;
        bool edid_delay_active;

        struct drm_encoder encoder;
        struct drm_connector connector;

        struct tda998x_audio_port audio_port[2];
};

#define conn_to_tda998x_priv(x) \
        container_of(x, struct tda998x_priv, connector)

#define enc_to_tda998x_priv(x) \
        container_of(x, struct tda998x_priv, encoder)

/* The TDA9988 series of devices use a paged register scheme.. to simplify
 * things we encode the page # in upper bits of the register #.  To read/
 * write a given register, we need to make sure CURPAGE register is set
 * appropriately.  Which implies reads/writes are not atomic.  Fun!
 */

#define REG(page, addr) (((page) << 8) | (addr))
#define REG2ADDR(reg)   ((reg) & 0xff)
#define REG2PAGE(reg)   (((reg) >> 8) & 0xff)

#define REG_CURPAGE               0xff                /* write */


/* Page 00h: General Control */
#define REG_VERSION_LSB           REG(0x00, 0x00)     /* read */
#define REG_MAIN_CNTRL0           REG(0x00, 0x01)     /* read/write */
# define MAIN_CNTRL0_SR           (1 << 0)
# define MAIN_CNTRL0_DECS         (1 << 1)
# define MAIN_CNTRL0_DEHS         (1 << 2)
# define MAIN_CNTRL0_CECS         (1 << 3)
# define MAIN_CNTRL0_CEHS         (1 << 4)
# define MAIN_CNTRL0_SCALER       (1 << 7)
#define REG_VERSION_MSB           REG(0x00, 0x02)     /* read */
#define REG_SOFTRESET             REG(0x00, 0x0a)     /* write */
# define SOFTRESET_AUDIO          (1 << 0)
# define SOFTRESET_I2C_MASTER     (1 << 1)
#define REG_DDC_DISABLE           REG(0x00, 0x0b)     /* read/write */
#define REG_CCLK_ON               REG(0x00, 0x0c)     /* read/write */
#define REG_I2C_MASTER            REG(0x00, 0x0d)     /* read/write */
# define I2C_MASTER_DIS_MM        (1 << 0)
# define I2C_MASTER_DIS_FILT      (1 << 1)
# define I2C_MASTER_APP_STRT_LAT  (1 << 2)
#define REG_FEAT_POWERDOWN        REG(0x00, 0x0e)     /* read/write */
# define FEAT_POWERDOWN_PREFILT   BIT(0)
# define FEAT_POWERDOWN_CSC       BIT(1)
# define FEAT_POWERDOWN_SPDIF     (1 << 3)
#define REG_INT_FLAGS_0           REG(0x00, 0x0f)     /* read/write */
#define REG_INT_FLAGS_1           REG(0x00, 0x10)     /* read/write */
#define REG_INT_FLAGS_2           REG(0x00, 0x11)     /* read/write */
# define INT_FLAGS_2_EDID_BLK_RD  (1 << 1)
#define REG_ENA_ACLK              REG(0x00, 0x16)     /* read/write */
#define REG_ENA_VP_0              REG(0x00, 0x18)     /* read/write */
#define REG_ENA_VP_1              REG(0x00, 0x19)     /* read/write */
#define REG_ENA_VP_2              REG(0x00, 0x1a)     /* read/write */
#define REG_ENA_AP                REG(0x00, 0x1e)     /* read/write */
#define REG_VIP_CNTRL_0           REG(0x00, 0x20)     /* write */
# define VIP_CNTRL_0_MIRR_A       (1 << 7)
# define VIP_CNTRL_0_SWAP_A(x)    (((x) & 7) << 4)
# define VIP_CNTRL_0_MIRR_B       (1 << 3)
# define VIP_CNTRL_0_SWAP_B(x)    (((x) & 7) << 0)
#define REG_VIP_CNTRL_1           REG(0x00, 0x21)     /* write */
# define VIP_CNTRL_1_MIRR_C       (1 << 7)
# define VIP_CNTRL_1_SWAP_C(x)    (((x) & 7) << 4)
# define VIP_CNTRL_1_MIRR_D       (1 << 3)
# define VIP_CNTRL_1_SWAP_D(x)    (((x) & 7) << 0)
#define REG_VIP_CNTRL_2           REG(0x00, 0x22)     /* write */
# define VIP_CNTRL_2_MIRR_E       (1 << 7)
# define VIP_CNTRL_2_SWAP_E(x)    (((x) & 7) << 4)
# define VIP_CNTRL_2_MIRR_F       (1 << 3)
# define VIP_CNTRL_2_SWAP_F(x)    (((x) & 7) << 0)
#define REG_VIP_CNTRL_3           REG(0x00, 0x23)     /* write */
# define VIP_CNTRL_3_X_TGL        (1 << 0)
# define VIP_CNTRL_3_H_TGL        (1 << 1)
# define VIP_CNTRL_3_V_TGL        (1 << 2)
# define VIP_CNTRL_3_EMB          (1 << 3)
# define VIP_CNTRL_3_SYNC_DE      (1 << 4)
# define VIP_CNTRL_3_SYNC_HS      (1 << 5)
# define VIP_CNTRL_3_DE_INT       (1 << 6)
# define VIP_CNTRL_3_EDGE         (1 << 7)
#define REG_VIP_CNTRL_4           REG(0x00, 0x24)     /* write */
# define VIP_CNTRL_4_BLC(x)       (((x) & 3) << 0)
# define VIP_CNTRL_4_BLANKIT(x)   (((x) & 3) << 2)
# define VIP_CNTRL_4_CCIR656      (1 << 4)
# define VIP_CNTRL_4_656_ALT      (1 << 5)
# define VIP_CNTRL_4_TST_656      (1 << 6)
# define VIP_CNTRL_4_TST_PAT      (1 << 7)
#define REG_VIP_CNTRL_5           REG(0x00, 0x25)     /* write */
# define VIP_CNTRL_5_CKCASE       (1 << 0)
# define VIP_CNTRL_5_SP_CNT(x)    (((x) & 3) << 1)
#define REG_MUX_AP                REG(0x00, 0x26)     /* read/write */
# define MUX_AP_SELECT_I2S        0x64
# define MUX_AP_SELECT_SPDIF      0x40
#define REG_MUX_VP_VIP_OUT        REG(0x00, 0x27)     /* read/write */
#define REG_MAT_CONTRL            REG(0x00, 0x80)     /* write */
# define MAT_CONTRL_MAT_SC(x)     (((x) & 3) << 0)
# define MAT_CONTRL_MAT_BP        (1 << 2)
#define REG_VIDFORMAT             REG(0x00, 0xa0)     /* write */
#define REG_REFPIX_MSB            REG(0x00, 0xa1)     /* write */
#define REG_REFPIX_LSB            REG(0x00, 0xa2)     /* write */
#define REG_REFLINE_MSB           REG(0x00, 0xa3)     /* write */
#define REG_REFLINE_LSB           REG(0x00, 0xa4)     /* write */
#define REG_NPIX_MSB              REG(0x00, 0xa5)     /* write */
#define REG_NPIX_LSB              REG(0x00, 0xa6)     /* write */
#define REG_NLINE_MSB             REG(0x00, 0xa7)     /* write */
#define REG_NLINE_LSB             REG(0x00, 0xa8)     /* write */
#define REG_VS_LINE_STRT_1_MSB    REG(0x00, 0xa9)     /* write */
#define REG_VS_LINE_STRT_1_LSB    REG(0x00, 0xaa)     /* write */
#define REG_VS_PIX_STRT_1_MSB     REG(0x00, 0xab)     /* write */
#define REG_VS_PIX_STRT_1_LSB     REG(0x00, 0xac)     /* write */
#define REG_VS_LINE_END_1_MSB     REG(0x00, 0xad)     /* write */
#define REG_VS_LINE_END_1_LSB     REG(0x00, 0xae)     /* write */
#define REG_VS_PIX_END_1_MSB      REG(0x00, 0xaf)     /* write */
#define REG_VS_PIX_END_1_LSB      REG(0x00, 0xb0)     /* write */
#define REG_VS_LINE_STRT_2_MSB    REG(0x00, 0xb1)     /* write */
#define REG_VS_LINE_STRT_2_LSB    REG(0x00, 0xb2)     /* write */
#define REG_VS_PIX_STRT_2_MSB     REG(0x00, 0xb3)     /* write */
#define REG_VS_PIX_STRT_2_LSB     REG(0x00, 0xb4)     /* write */
#define REG_VS_LINE_END_2_MSB     REG(0x00, 0xb5)     /* write */
#define REG_VS_LINE_END_2_LSB     REG(0x00, 0xb6)     /* write */
#define REG_VS_PIX_END_2_MSB      REG(0x00, 0xb7)     /* write */
#define REG_VS_PIX_END_2_LSB      REG(0x00, 0xb8)     /* write */
#define REG_HS_PIX_START_MSB      REG(0x00, 0xb9)     /* write */
#define REG_HS_PIX_START_LSB      REG(0x00, 0xba)     /* write */
#define REG_HS_PIX_STOP_MSB       REG(0x00, 0xbb)     /* write */
#define REG_HS_PIX_STOP_LSB       REG(0x00, 0xbc)     /* write */
#define REG_VWIN_START_1_MSB      REG(0x00, 0xbd)     /* write */
#define REG_VWIN_START_1_LSB      REG(0x00, 0xbe)     /* write */
#define REG_VWIN_END_1_MSB        REG(0x00, 0xbf)     /* write */
#define REG_VWIN_END_1_LSB        REG(0x00, 0xc0)     /* write */
#define REG_VWIN_START_2_MSB      REG(0x00, 0xc1)     /* write */
#define REG_VWIN_START_2_LSB      REG(0x00, 0xc2)     /* write */
#define REG_VWIN_END_2_MSB        REG(0x00, 0xc3)     /* write */
#define REG_VWIN_END_2_LSB        REG(0x00, 0xc4)     /* write */
#define REG_DE_START_MSB          REG(0x00, 0xc5)     /* write */
#define REG_DE_START_LSB          REG(0x00, 0xc6)     /* write */
#define REG_DE_STOP_MSB           REG(0x00, 0xc7)     /* write */
#define REG_DE_STOP_LSB           REG(0x00, 0xc8)     /* write */
#define REG_TBG_CNTRL_0           REG(0x00, 0xca)     /* write */
# define TBG_CNTRL_0_TOP_TGL      (1 << 0)
# define TBG_CNTRL_0_TOP_SEL      (1 << 1)
# define TBG_CNTRL_0_DE_EXT       (1 << 2)
# define TBG_CNTRL_0_TOP_EXT      (1 << 3)
# define TBG_CNTRL_0_FRAME_DIS    (1 << 5)
# define TBG_CNTRL_0_SYNC_MTHD    (1 << 6)
# define TBG_CNTRL_0_SYNC_ONCE    (1 << 7)
#define REG_TBG_CNTRL_1           REG(0x00, 0xcb)     /* write */
# define TBG_CNTRL_1_H_TGL        (1 << 0)
# define TBG_CNTRL_1_V_TGL        (1 << 1)
# define TBG_CNTRL_1_TGL_EN       (1 << 2)
# define TBG_CNTRL_1_X_EXT        (1 << 3)
# define TBG_CNTRL_1_H_EXT        (1 << 4)
# define TBG_CNTRL_1_V_EXT        (1 << 5)
# define TBG_CNTRL_1_DWIN_DIS     (1 << 6)
#define REG_ENABLE_SPACE          REG(0x00, 0xd6)     /* write */
#define REG_HVF_CNTRL_0           REG(0x00, 0xe4)     /* write */
# define HVF_CNTRL_0_SM           (1 << 7)
# define HVF_CNTRL_0_RWB          (1 << 6)
# define HVF_CNTRL_0_PREFIL(x)    (((x) & 3) << 2)
# define HVF_CNTRL_0_INTPOL(x)    (((x) & 3) << 0)
#define REG_HVF_CNTRL_1           REG(0x00, 0xe5)     /* write */
# define HVF_CNTRL_1_FOR          (1 << 0)
# define HVF_CNTRL_1_YUVBLK       (1 << 1)
# define HVF_CNTRL_1_VQR(x)       (((x) & 3) << 2)
# define HVF_CNTRL_1_PAD(x)       (((x) & 3) << 4)
# define HVF_CNTRL_1_SEMI_PLANAR  (1 << 6)
#define REG_RPT_CNTRL             REG(0x00, 0xf0)     /* write */
#define REG_I2S_FORMAT            REG(0x00, 0xfc)     /* read/write */
# define I2S_FORMAT(x)            (((x) & 3) << 0)
#define REG_AIP_CLKSEL            REG(0x00, 0xfd)     /* write */
# define AIP_CLKSEL_AIP_SPDIF     (0 << 3)
# define AIP_CLKSEL_AIP_I2S       (1 << 3)
# define AIP_CLKSEL_FS_ACLK       (0 << 0)
# define AIP_CLKSEL_FS_MCLK       (1 << 0)
# define AIP_CLKSEL_FS_FS64SPDIF  (2 << 0)

/* Page 02h: PLL settings */
#define REG_PLL_SERIAL_1          REG(0x02, 0x00)     /* read/write */
# define PLL_SERIAL_1_SRL_FDN     (1 << 0)
# define PLL_SERIAL_1_SRL_IZ(x)   (((x) & 3) << 1)
# define PLL_SERIAL_1_SRL_MAN_IZ  (1 << 6)
#define REG_PLL_SERIAL_2          REG(0x02, 0x01)     /* read/write */
# define PLL_SERIAL_2_SRL_NOSC(x) ((x) << 0)
# define PLL_SERIAL_2_SRL_PR(x)   (((x) & 0xf) << 4)
#define REG_PLL_SERIAL_3          REG(0x02, 0x02)     /* read/write */
# define PLL_SERIAL_3_SRL_CCIR    (1 << 0)
# define PLL_SERIAL_3_SRL_DE      (1 << 2)
# define PLL_SERIAL_3_SRL_PXIN_SEL (1 << 4)
#define REG_SERIALIZER            REG(0x02, 0x03)     /* read/write */
#define REG_BUFFER_OUT            REG(0x02, 0x04)     /* read/write */
#define REG_PLL_SCG1              REG(0x02, 0x05)     /* read/write */
#define REG_PLL_SCG2              REG(0x02, 0x06)     /* read/write */
#define REG_PLL_SCGN1             REG(0x02, 0x07)     /* read/write */
#define REG_PLL_SCGN2             REG(0x02, 0x08)     /* read/write */
#define REG_PLL_SCGR1             REG(0x02, 0x09)     /* read/write */
#define REG_PLL_SCGR2             REG(0x02, 0x0a)     /* read/write */
#define REG_AUDIO_DIV             REG(0x02, 0x0e)     /* read/write */
# define AUDIO_DIV_SERCLK_1       0
# define AUDIO_DIV_SERCLK_2       1
# define AUDIO_DIV_SERCLK_4       2
# define AUDIO_DIV_SERCLK_8       3
# define AUDIO_DIV_SERCLK_16      4
# define AUDIO_DIV_SERCLK_32      5
#define REG_SEL_CLK               REG(0x02, 0x11)     /* read/write */
# define SEL_CLK_SEL_CLK1         (1 << 0)
# define SEL_CLK_SEL_VRF_CLK(x)   (((x) & 3) << 1)
# define SEL_CLK_ENA_SC_CLK       (1 << 3)
#define REG_ANA_GENERAL           REG(0x02, 0x12)     /* read/write */


/* Page 09h: EDID Control */
#define REG_EDID_DATA_0           REG(0x09, 0x00)     /* read */
/* next 127 successive registers are the EDID block */
#define REG_EDID_CTRL             REG(0x09, 0xfa)     /* read/write */
#define REG_DDC_ADDR              REG(0x09, 0xfb)     /* read/write */
#define REG_DDC_OFFS              REG(0x09, 0xfc)     /* read/write */
#define REG_DDC_SEGM_ADDR         REG(0x09, 0xfd)     /* read/write */
#define REG_DDC_SEGM              REG(0x09, 0xfe)     /* read/write */


/* Page 10h: information frames and packets */
#define REG_IF1_HB0               REG(0x10, 0x20)     /* read/write */
#define REG_IF2_HB0               REG(0x10, 0x40)     /* read/write */
#define REG_IF3_HB0               REG(0x10, 0x60)     /* read/write */
#define REG_IF4_HB0               REG(0x10, 0x80)     /* read/write */
#define REG_IF5_HB0               REG(0x10, 0xa0)     /* read/write */


/* Page 11h: audio settings and content info packets */
#define REG_AIP_CNTRL_0           REG(0x11, 0x00)     /* read/write */
# define AIP_CNTRL_0_RST_FIFO     (1 << 0)
# define AIP_CNTRL_0_SWAP         (1 << 1)
# define AIP_CNTRL_0_LAYOUT       (1 << 2)
# define AIP_CNTRL_0_ACR_MAN      (1 << 5)
# define AIP_CNTRL_0_RST_CTS      (1 << 6)
#define REG_CA_I2S                REG(0x11, 0x01)     /* read/write */
# define CA_I2S_CA_I2S(x)         (((x) & 31) << 0)
# define CA_I2S_HBR_CHSTAT        (1 << 6)
#define REG_LATENCY_RD            REG(0x11, 0x04)     /* read/write */
#define REG_ACR_CTS_0             REG(0x11, 0x05)     /* read/write */
#define REG_ACR_CTS_1             REG(0x11, 0x06)     /* read/write */
#define REG_ACR_CTS_2             REG(0x11, 0x07)     /* read/write */
#define REG_ACR_N_0               REG(0x11, 0x08)     /* read/write */
#define REG_ACR_N_1               REG(0x11, 0x09)     /* read/write */
#define REG_ACR_N_2               REG(0x11, 0x0a)     /* read/write */
#define REG_CTS_N                 REG(0x11, 0x0c)     /* read/write */
# define CTS_N_K(x)               (((x) & 7) << 0)
# define CTS_N_M(x)               (((x) & 3) << 4)
#define REG_ENC_CNTRL             REG(0x11, 0x0d)     /* read/write */
# define ENC_CNTRL_RST_ENC        (1 << 0)
# define ENC_CNTRL_RST_SEL        (1 << 1)
# define ENC_CNTRL_CTL_CODE(x)    (((x) & 3) << 2)
#define REG_DIP_FLAGS             REG(0x11, 0x0e)     /* read/write */
# define DIP_FLAGS_ACR            (1 << 0)
# define DIP_FLAGS_GC             (1 << 1)
#define REG_DIP_IF_FLAGS          REG(0x11, 0x0f)     /* read/write */
# define DIP_IF_FLAGS_IF1         (1 << 1)
# define DIP_IF_FLAGS_IF2         (1 << 2)
# define DIP_IF_FLAGS_IF3         (1 << 3)
# define DIP_IF_FLAGS_IF4         (1 << 4)
# define DIP_IF_FLAGS_IF5         (1 << 5)
#define REG_CH_STAT_B(x)          REG(0x11, 0x14 + (x)) /* read/write */


/* Page 12h: HDCP and OTP */
#define REG_TX3                   REG(0x12, 0x9a)     /* read/write */
#define REG_TX4                   REG(0x12, 0x9b)     /* read/write */
# define TX4_PD_RAM               (1 << 1)
#define REG_TX33                  REG(0x12, 0xb8)     /* read/write */
# define TX33_HDMI                (1 << 1)


/* Page 13h: Gamut related metadata packets */



/* CEC registers: (not paged)
 */
#define REG_CEC_INTSTATUS         0xee                /* read */
# define CEC_INTSTATUS_CEC        (1 << 0)
# define CEC_INTSTATUS_HDMI       (1 << 1)
#define REG_CEC_FRO_IM_CLK_CTRL   0xfb                /* read/write */
# define CEC_FRO_IM_CLK_CTRL_GHOST_DIS (1 << 7)
# define CEC_FRO_IM_CLK_CTRL_ENA_OTP   (1 << 6)
# define CEC_FRO_IM_CLK_CTRL_IMCLK_SEL (1 << 1)
# define CEC_FRO_IM_CLK_CTRL_FRO_DIV   (1 << 0)
#define REG_CEC_RXSHPDINTENA      0xfc                /* read/write */
#define REG_CEC_RXSHPDINT         0xfd                /* read */
# define CEC_RXSHPDINT_RXSENS     BIT(0)
# define CEC_RXSHPDINT_HPD        BIT(1)
#define REG_CEC_RXSHPDLEV         0xfe                /* read */
# define CEC_RXSHPDLEV_RXSENS     (1 << 0)
# define CEC_RXSHPDLEV_HPD        (1 << 1)

#define REG_CEC_ENAMODS           0xff                /* read/write */
# define CEC_ENAMODS_DIS_FRO      (1 << 6)
# define CEC_ENAMODS_DIS_CCLK     (1 << 5)
# define CEC_ENAMODS_EN_RXSENS    (1 << 2)
# define CEC_ENAMODS_EN_HDMI      (1 << 1)
# define CEC_ENAMODS_EN_CEC       (1 << 0)


/* Device versions: */
#define TDA9989N2                 0x0101
#define TDA19989                  0x0201
#define TDA19989N2                0x0202
#define TDA19988                  0x0301

static void
cec_write(struct tda998x_priv *priv, u16 addr, u8 val)
{
        u8 buf[] = {addr, val};
        struct i2c_msg msg = {
                .addr = priv->cec_addr,
                .len = 2,
                .buf = buf,
        };
        int ret;

        ret = i2c_transfer(priv->hdmi->adapter, &msg, 1);
        if (ret < 0)
                dev_err(&priv->hdmi->dev, "Error %d writing to cec:0x%x\n",
                        ret, addr);
}

static u8
cec_read(struct tda998x_priv *priv, u8 addr)
{
        u8 val;
        struct i2c_msg msg[2] = {
                {
                        .addr = priv->cec_addr,
                        .len = 1,
                        .buf = &addr,
                }, {
                        .addr = priv->cec_addr,
                        .flags = I2C_M_RD,
                        .len = 1,
                        .buf = &val,
                },
        };
        int ret;

        ret = i2c_transfer(priv->hdmi->adapter, msg, ARRAY_SIZE(msg));
        if (ret < 0) {
                dev_err(&priv->hdmi->dev, "Error %d reading from cec:0x%x\n",
                        ret, addr);
                val = 0;
        }

        return val;
}

static int
set_page(struct tda998x_priv *priv, u16 reg)
{
        if (REG2PAGE(reg) != priv->current_page) {
                struct i2c_client *client = priv->hdmi;
                u8 buf[] = {
                                REG_CURPAGE, REG2PAGE(reg)
                };
                int ret = i2c_master_send(client, buf, sizeof(buf));
                if (ret < 0) {
                        dev_err(&client->dev, "%s %04x err %d\n", __func__,
                                        reg, ret);
                        return ret;
                }

                priv->current_page = REG2PAGE(reg);
        }
        return 0;
}

static int
reg_read_range(struct tda998x_priv *priv, u16 reg, char *buf, int cnt)
{
        struct i2c_client *client = priv->hdmi;
        u8 addr = REG2ADDR(reg);
        int ret;

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, &addr, sizeof(addr));
        if (ret < 0)
                goto fail;

        ret = i2c_master_recv(client, buf, cnt);
        if (ret < 0)
                goto fail;

        goto out;

fail:
        dev_err(&client->dev, "Error %d reading from 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
        return ret;
}

static void
reg_write_range(struct tda998x_priv *priv, u16 reg, u8 *p, int cnt)
{
        struct i2c_client *client = priv->hdmi;
        u8 buf[cnt+1];
        int ret;

        buf[0] = REG2ADDR(reg);
        memcpy(&buf[1], p, cnt);

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, buf, cnt + 1);
        if (ret < 0)
                dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
}

static int
reg_read(struct tda998x_priv *priv, u16 reg)
{
        u8 val = 0;
        int ret;

        ret = reg_read_range(priv, reg, &val, sizeof(val));
        if (ret < 0)
                return ret;
        return val;
}

static void
reg_write(struct tda998x_priv *priv, u16 reg, u8 val)
{
        struct i2c_client *client = priv->hdmi;
        u8 buf[] = {REG2ADDR(reg), val};
        int ret;

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, buf, sizeof(buf));
        if (ret < 0)
                dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
}

static void
reg_write16(struct tda998x_priv *priv, u16 reg, u16 val)
{
        struct i2c_client *client = priv->hdmi;
        u8 buf[] = {REG2ADDR(reg), val >> 8, val};
        int ret;

        mutex_lock(&priv->mutex);
        ret = set_page(priv, reg);
        if (ret < 0)
                goto out;

        ret = i2c_master_send(client, buf, sizeof(buf));
        if (ret < 0)
                dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
        mutex_unlock(&priv->mutex);
}

static void
reg_set(struct tda998x_priv *priv, u16 reg, u8 val)
{
        int old_val;

        old_val = reg_read(priv, reg);
        if (old_val >= 0)
                reg_write(priv, reg, old_val | val);
}

static void
reg_clear(struct tda998x_priv *priv, u16 reg, u8 val)
{
        int old_val;

        old_val = reg_read(priv, reg);
        if (old_val >= 0)
                reg_write(priv, reg, old_val & ~val);
}

static void
tda998x_reset(struct tda998x_priv *priv)
{
        /* reset audio and i2c master: */
        reg_write(priv, REG_SOFTRESET, SOFTRESET_AUDIO | SOFTRESET_I2C_MASTER);
        msleep(50);
        reg_write(priv, REG_SOFTRESET, 0);
        msleep(50);

        /* reset transmitter: */
        reg_set(priv, REG_MAIN_CNTRL0, MAIN_CNTRL0_SR);
        reg_clear(priv, REG_MAIN_CNTRL0, MAIN_CNTRL0_SR);

        /* PLL registers common configuration */
        reg_write(priv, REG_PLL_SERIAL_1, 0x00);
        reg_write(priv, REG_PLL_SERIAL_2, PLL_SERIAL_2_SRL_NOSC(1));
        reg_write(priv, REG_PLL_SERIAL_3, 0x00);
        reg_write(priv, REG_SERIALIZER,   0x00);
        reg_write(priv, REG_BUFFER_OUT,   0x00);
        reg_write(priv, REG_PLL_SCG1,     0x00);
        reg_write(priv, REG_AUDIO_DIV,    AUDIO_DIV_SERCLK_8);
        reg_write(priv, REG_SEL_CLK,      SEL_CLK_SEL_CLK1 | SEL_CLK_ENA_SC_CLK);
        reg_write(priv, REG_PLL_SCGN1,    0xfa);
        reg_write(priv, REG_PLL_SCGN2,    0x00);
        reg_write(priv, REG_PLL_SCGR1,    0x5b);
        reg_write(priv, REG_PLL_SCGR2,    0x00);
        reg_write(priv, REG_PLL_SCG2,     0x10);

        /* Write the default value MUX register */
        reg_write(priv, REG_MUX_VP_VIP_OUT, 0x24);
}

/*
 * The TDA998x has a problem when trying to read the EDID close to a
 * HPD assertion: it needs a delay of 100ms to avoid timing out while
 * trying to read EDID data.
 *
 * However, tda998x_connector_get_modes() may be called at any moment
 * after tda998x_connector_detect() indicates that we are connected, so
 * we need to delay probing modes in tda998x_connector_get_modes() after
 * we have seen a HPD inactive->active transition.  This code implements
 * that delay.
 */
static void tda998x_edid_delay_done(unsigned long data)
{
        struct tda998x_priv *priv = (struct tda998x_priv *)data;

        priv->edid_delay_active = false;
        wake_up(&priv->edid_delay_waitq);
        schedule_work(&priv->detect_work);
}

static void tda998x_edid_delay_start(struct tda998x_priv *priv)
{
        priv->edid_delay_active = true;
        mod_timer(&priv->edid_delay_timer, jiffies + HZ/10);
}

static int tda998x_edid_delay_wait(struct tda998x_priv *priv)
{
        return wait_event_killable(priv->edid_delay_waitq, !priv->edid_delay_active);
}

/*
 * We need to run the KMS hotplug event helper outside of our threaded
 * interrupt routine as this can call back into our get_modes method,
 * which will want to make use of interrupts.
 */
static void tda998x_detect_work(struct work_struct *work)
{
        struct tda998x_priv *priv =
                container_of(work, struct tda998x_priv, detect_work);
        struct drm_device *dev = priv->encoder.dev;

        if (dev)
                drm_kms_helper_hotplug_event(dev);
}

/*
 * only 2 interrupts may occur: screen plug/unplug and EDID read
 */
static irqreturn_t tda998x_irq_thread(int irq, void *data)
{
        struct tda998x_priv *priv = data;
        u8 sta, cec, lvl, flag0, flag1, flag2;
        bool handled = false;

        sta = cec_read(priv, REG_CEC_INTSTATUS);
        if (sta & CEC_INTSTATUS_HDMI) {
                cec = cec_read(priv, REG_CEC_RXSHPDINT);
                lvl = cec_read(priv, REG_CEC_RXSHPDLEV);
                flag0 = reg_read(priv, REG_INT_FLAGS_0);
                flag1 = reg_read(priv, REG_INT_FLAGS_1);
                flag2 = reg_read(priv, REG_INT_FLAGS_2);
                DRM_DEBUG_DRIVER(
                        "tda irq sta %02x cec %02x lvl %02x f0 %02x f1 %02x f2 %02x\n",
                        sta, cec, lvl, flag0, flag1, flag2);

                if (cec & CEC_RXSHPDINT_HPD) {
                        if (lvl & CEC_RXSHPDLEV_HPD)
                                tda998x_edid_delay_start(priv);
                        else
                                schedule_work(&priv->detect_work);

                        handled = true;
                }

                if ((flag2 & INT_FLAGS_2_EDID_BLK_RD) && priv->wq_edid_wait) {
                        priv->wq_edid_wait = 0;
                        wake_up(&priv->wq_edid);
                        handled = true;
                }
        }

        return IRQ_RETVAL(handled);
}

static void
tda998x_write_if(struct tda998x_priv *priv, u8 bit, u16 addr,
                 union hdmi_infoframe *frame)
{
        u8 buf[32];
        ssize_t len;

        len = hdmi_infoframe_pack(frame, buf, sizeof(buf));
        if (len < 0) {
                dev_err(&priv->hdmi->dev,
                        "hdmi_infoframe_pack() type=0x%02x failed: %zd\n",
                        frame->any.type, len);
                return;
        }

        reg_clear(priv, REG_DIP_IF_FLAGS, bit);
        reg_write_range(priv, addr, buf, len);
        reg_set(priv, REG_DIP_IF_FLAGS, bit);
}

static int tda998x_write_aif(struct tda998x_priv *priv,
                             struct hdmi_audio_infoframe *cea)
{
        union hdmi_infoframe frame;

        frame.audio = *cea;

        tda998x_write_if(priv, DIP_IF_FLAGS_IF4, REG_IF4_HB0, &frame);

        return 0;
}

static void
tda998x_write_avi(struct tda998x_priv *priv, struct drm_display_mode *mode)
{
        union hdmi_infoframe frame;

        drm_hdmi_avi_infoframe_from_display_mode(&frame.avi, mode);
        frame.avi.quantization_range = HDMI_QUANTIZATION_RANGE_FULL;

        tda998x_write_if(priv, DIP_IF_FLAGS_IF2, REG_IF2_HB0, &frame);
}

/* Audio support */

static void tda998x_audio_mute(struct tda998x_priv *priv, bool on)
{
        if (on) {
                reg_set(priv, REG_SOFTRESET, SOFTRESET_AUDIO);
                reg_clear(priv, REG_SOFTRESET, SOFTRESET_AUDIO);
                reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);
        } else {
                reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);
        }
}

static int
tda998x_configure_audio(struct tda998x_priv *priv,
                        struct tda998x_audio_params *params)
{
        u8 buf[6], clksel_aip, clksel_fs, cts_n, adiv;
        u32 n;

        /* Enable audio ports */
        reg_write(priv, REG_ENA_AP, params->config);

        /* Set audio input source */
        switch (params->format) {
        case AFMT_SPDIF:
                reg_write(priv, REG_ENA_ACLK, 0);
                reg_write(priv, REG_MUX_AP, MUX_AP_SELECT_SPDIF);
                clksel_aip = AIP_CLKSEL_AIP_SPDIF;
                clksel_fs = AIP_CLKSEL_FS_FS64SPDIF;
                cts_n = CTS_N_M(3) | CTS_N_K(3);
                break;

        case AFMT_I2S:
                reg_write(priv, REG_ENA_ACLK, 1);
                reg_write(priv, REG_MUX_AP, MUX_AP_SELECT_I2S);
                clksel_aip = AIP_CLKSEL_AIP_I2S;
                clksel_fs = AIP_CLKSEL_FS_ACLK;
                switch (params->sample_width) {
                case 16:
                        cts_n = CTS_N_M(3) | CTS_N_K(1);
                        break;
                case 18:
                case 20:
                case 24:
                        cts_n = CTS_N_M(3) | CTS_N_K(2);
                        break;
                default:
                case 32:
                        cts_n = CTS_N_M(3) | CTS_N_K(3);
                        break;
                }
                break;

        default:
                dev_err(&priv->hdmi->dev, "Unsupported I2S format\n");
                return -EINVAL;
        }

        reg_write(priv, REG_AIP_CLKSEL, clksel_aip);
        reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_LAYOUT |
                                        AIP_CNTRL_0_ACR_MAN);   /* auto CTS */
        reg_write(priv, REG_CTS_N, cts_n);

        /*
         * Audio input somehow depends on HDMI line rate which is
         * related to pixclk. Testing showed that modes with pixclk
         * >100MHz need a larger divider while <40MHz need the default.
         * There is no detailed info in the datasheet, so we just
         * assume 100MHz requires larger divider.
         */
        adiv = AUDIO_DIV_SERCLK_8;
        if (priv->tmds_clock > 100000)
                adiv++;                 /* AUDIO_DIV_SERCLK_16 */

        /* S/PDIF asks for a larger divider */
        if (params->format == AFMT_SPDIF)
                adiv++;                 /* AUDIO_DIV_SERCLK_16 or _32 */

        reg_write(priv, REG_AUDIO_DIV, adiv);

        /*
         * This is the approximate value of N, which happens to be
         * the recommended values for non-coherent clocks.
         */
        n = 128 * params->sample_rate / 1000;

        /* Write the CTS and N values */
        buf[0] = 0x44;
        buf[1] = 0x42;
        buf[2] = 0x01;
        buf[3] = n;
        buf[4] = n >> 8;
        buf[5] = n >> 16;
        reg_write_range(priv, REG_ACR_CTS_0, buf, 6);

        /* Set CTS clock reference */
        reg_write(priv, REG_AIP_CLKSEL, clksel_aip | clksel_fs);

        /* Reset CTS generator */
        reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_CTS);
        reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_CTS);

        /* Write the channel status
         * The REG_CH_STAT_B-registers skip IEC958 AES2 byte, because
         * there is a separate register for each I2S wire.
         */
        buf[0] = params->status[0];
        buf[1] = params->status[1];
        buf[2] = params->status[3];
        buf[3] = params->status[4];
        reg_write_range(priv, REG_CH_STAT_B(0), buf, 4);

        tda998x_audio_mute(priv, true);
        msleep(20);
        tda998x_audio_mute(priv, false);

        return tda998x_write_aif(priv, &params->cea);
}

static int tda998x_audio_hw_params(struct device *dev, void *data,
                                   struct hdmi_codec_daifmt *daifmt,
                                   struct hdmi_codec_params *params)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);
        int i, ret;
        struct tda998x_audio_params audio = {
                .sample_width = params->sample_width,
                .sample_rate = params->sample_rate,
                .cea = params->cea,
        };

        memcpy(audio.status, params->iec.status,
               min(sizeof(audio.status), sizeof(params->iec.status)));

        switch (daifmt->fmt) {
        case HDMI_I2S:
                if (daifmt->bit_clk_inv || daifmt->frame_clk_inv ||
                    daifmt->bit_clk_master || daifmt->frame_clk_master) {
                        dev_err(dev, "%s: Bad flags %d %d %d %d\n", __func__,
                                daifmt->bit_clk_inv, daifmt->frame_clk_inv,
                                daifmt->bit_clk_master,
                                daifmt->frame_clk_master);
                        return -EINVAL;
                }
                for (i = 0; i < ARRAY_SIZE(priv->audio_port); i++)
                        if (priv->audio_port[i].format == AFMT_I2S)
                                audio.config = priv->audio_port[i].config;
                audio.format = AFMT_I2S;
                break;
        case HDMI_SPDIF:
                for (i = 0; i < ARRAY_SIZE(priv->audio_port); i++)
                        if (priv->audio_port[i].format == AFMT_SPDIF)
                                audio.config = priv->audio_port[i].config;
                audio.format = AFMT_SPDIF;
                break;
        default:
                dev_err(dev, "%s: Invalid format %d\n", __func__, daifmt->fmt);
                return -EINVAL;
        }

        if (audio.config == 0) {
                dev_err(dev, "%s: No audio configuration found\n", __func__);
                return -EINVAL;
        }

        mutex_lock(&priv->audio_mutex);
        if (priv->supports_infoframes && priv->sink_has_audio)
                ret = tda998x_configure_audio(priv, &audio);
        else
                ret = 0;

        if (ret == 0)
                priv->audio_params = audio;
        mutex_unlock(&priv->audio_mutex);

        return ret;
}

static void tda998x_audio_shutdown(struct device *dev, void *data)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        mutex_lock(&priv->audio_mutex);

        reg_write(priv, REG_ENA_AP, 0);

        priv->audio_params.format = AFMT_UNUSED;

        mutex_unlock(&priv->audio_mutex);
}

int tda998x_audio_digital_mute(struct device *dev, void *data, bool enable)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        mutex_lock(&priv->audio_mutex);

        tda998x_audio_mute(priv, enable);

        mutex_unlock(&priv->audio_mutex);
        return 0;
}

static int tda998x_audio_get_eld(struct device *dev, void *data,
                                 uint8_t *buf, size_t len)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        mutex_lock(&priv->audio_mutex);
        memcpy(buf, priv->connector.eld,
               min(sizeof(priv->connector.eld), len));
        mutex_unlock(&priv->audio_mutex);

        return 0;
}

static const struct hdmi_codec_ops audio_codec_ops = {
        .hw_params = tda998x_audio_hw_params,
        .audio_shutdown = tda998x_audio_shutdown,
        .digital_mute = tda998x_audio_digital_mute,
        .get_eld = tda998x_audio_get_eld,
};

static int tda998x_audio_codec_init(struct tda998x_priv *priv,
                                    struct device *dev)
{
        struct hdmi_codec_pdata codec_data = {
                .ops = &audio_codec_ops,
                .max_i2s_channels = 2,
        };
        int i;

        for (i = 0; i < ARRAY_SIZE(priv->audio_port); i++) {
                if (priv->audio_port[i].format == AFMT_I2S &&
                    priv->audio_port[i].config != 0)
                        codec_data.i2s = 1;
                if (priv->audio_port[i].format == AFMT_SPDIF &&
                    priv->audio_port[i].config != 0)
                        codec_data.spdif = 1;
        }

        priv->audio_pdev = platform_device_register_data(
                dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
                &codec_data, sizeof(codec_data));

        return PTR_ERR_OR_ZERO(priv->audio_pdev);
}

/* DRM connector functions */

static int tda998x_connector_dpms(struct drm_connector *connector, int mode)
{
        if (drm_core_check_feature(connector->dev, DRIVER_ATOMIC))
                return drm_atomic_helper_connector_dpms(connector, mode);
        else
                return drm_helper_connector_dpms(connector, mode);
}

static int tda998x_connector_fill_modes(struct drm_connector *connector,
                                        uint32_t maxX, uint32_t maxY)
{
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);
        int ret;

        mutex_lock(&priv->audio_mutex);
        ret = drm_helper_probe_single_connector_modes(connector, maxX, maxY);

        if (connector->edid_blob_ptr) {
                struct edid *edid = (void *)connector->edid_blob_ptr->data;

                priv->sink_has_audio = drm_detect_monitor_audio(edid);
        } else {
                priv->sink_has_audio = false;
        }
        mutex_unlock(&priv->audio_mutex);

        return ret;
}

static enum drm_connector_status
tda998x_connector_detect(struct drm_connector *connector, bool force)
{
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);
        u8 val = cec_read(priv, REG_CEC_RXSHPDLEV);

        return (val & CEC_RXSHPDLEV_HPD) ? connector_status_connected :
                        connector_status_disconnected;
}

static void tda998x_connector_destroy(struct drm_connector *connector)
{
        drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs tda998x_connector_funcs = {
        .dpms = tda998x_connector_dpms,
        .reset = drm_atomic_helper_connector_reset,
        .fill_modes = tda998x_connector_fill_modes,
        .detect = tda998x_connector_detect,
        .destroy = tda998x_connector_destroy,
        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length)
{
        struct tda998x_priv *priv = data;
        u8 offset, segptr;
        int ret, i;

        offset = (blk & 1) ? 128 : 0;
        segptr = blk / 2;

        reg_write(priv, REG_DDC_ADDR, 0xa0);
        reg_write(priv, REG_DDC_OFFS, offset);
        reg_write(priv, REG_DDC_SEGM_ADDR, 0x60);
        reg_write(priv, REG_DDC_SEGM, segptr);

        /* enable reading EDID: */
        priv->wq_edid_wait = 1;
        reg_write(priv, REG_EDID_CTRL, 0x1);

        /* flag must be cleared by sw: */
        reg_write(priv, REG_EDID_CTRL, 0x0);

        /* wait for block read to complete: */
        if (priv->hdmi->irq) {
                i = wait_event_timeout(priv->wq_edid,
                                        !priv->wq_edid_wait,
                                        msecs_to_jiffies(100));
                if (i < 0) {
                        dev_err(&priv->hdmi->dev, "read edid wait err %d\n", i);
                        return i;
                }
        } else {
                for (i = 100; i > 0; i--) {
                        msleep(1);
                        ret = reg_read(priv, REG_INT_FLAGS_2);
                        if (ret < 0)
                                return ret;
                        if (ret & INT_FLAGS_2_EDID_BLK_RD)
                                break;
                }
        }

        if (i == 0) {
                dev_err(&priv->hdmi->dev, "read edid timeout\n");
                return -ETIMEDOUT;
        }

        ret = reg_read_range(priv, REG_EDID_DATA_0, buf, length);
        if (ret != length) {
                dev_err(&priv->hdmi->dev, "failed to read edid block %d: %d\n",
                        blk, ret);
                return ret;
        }

        return 0;
}

static int tda998x_connector_get_modes(struct drm_connector *connector)
{
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);
        struct edid *edid;
        int n;

        /*
         * If we get killed while waiting for the HPD timeout, return
         * no modes found: we are not in a restartable path, so we
         * can't handle signals gracefully.
         */
        if (tda998x_edid_delay_wait(priv))
                return 0;

        if (priv->rev == TDA19988)
                reg_clear(priv, REG_TX4, TX4_PD_RAM);

        edid = drm_do_get_edid(connector, read_edid_block, priv);

        if (priv->rev == TDA19988)
                reg_set(priv, REG_TX4, TX4_PD_RAM);

        if (!edid) {
                dev_warn(&priv->hdmi->dev, "failed to read EDID\n");
                return 0;
        }

        drm_mode_connector_update_edid_property(connector, edid);
        n = drm_add_edid_modes(connector, edid);
        drm_edid_to_eld(connector, edid);

        kfree(edid);

        return n;
}

static int tda998x_connector_mode_valid(struct drm_connector *connector,
                                        struct drm_display_mode *mode)
{
        /* TDA19988 dotclock can go up to 165MHz */
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);

        if (mode->clock > ((priv->rev == TDA19988) ? 165000 : 150000))
                return MODE_CLOCK_HIGH;
        if (mode->htotal >= BIT(13))
                return MODE_BAD_HVALUE;
        if (mode->vtotal >= BIT(11))
                return MODE_BAD_VVALUE;
        return MODE_OK;
}

static struct drm_encoder *
tda998x_connector_best_encoder(struct drm_connector *connector)
{
        struct tda998x_priv *priv = conn_to_tda998x_priv(connector);

        return &priv->encoder;
}

static
const struct drm_connector_helper_funcs tda998x_connector_helper_funcs = {
        .get_modes = tda998x_connector_get_modes,
        .mode_valid = tda998x_connector_mode_valid,
        .best_encoder = tda998x_connector_best_encoder,
};

static int tda998x_connector_init(struct tda998x_priv *priv,
                                  struct drm_device *drm)
{
        struct drm_connector *connector = &priv->connector;
        int ret;

        connector->interlace_allowed = 1;

        if (priv->hdmi->irq)
                connector->polled = DRM_CONNECTOR_POLL_HPD;
        else
                connector->polled = DRM_CONNECTOR_POLL_CONNECT |
                        DRM_CONNECTOR_POLL_DISCONNECT;

        drm_connector_helper_add(connector, &tda998x_connector_helper_funcs);
        ret = drm_connector_init(drm, connector, &tda998x_connector_funcs,
                                 DRM_MODE_CONNECTOR_HDMIA);
        if (ret)
                return ret;

        drm_mode_connector_attach_encoder(&priv->connector, &priv->encoder);

        return 0;
}

/* DRM encoder functions */

static void tda998x_encoder_dpms(struct drm_encoder *encoder, int mode)
{
        struct tda998x_priv *priv = enc_to_tda998x_priv(encoder);
        bool on;

        /* we only care about on or off: */
        on = mode == DRM_MODE_DPMS_ON;

        if (on == priv->is_on)
                return;

        if (on) {
                /* enable video ports, audio will be enabled later */
                reg_write(priv, REG_ENA_VP_0, 0xff);
                reg_write(priv, REG_ENA_VP_1, 0xff);
                reg_write(priv, REG_ENA_VP_2, 0xff);
                /* set muxing after enabling ports: */
                reg_write(priv, REG_VIP_CNTRL_0, priv->vip_cntrl_0);
                reg_write(priv, REG_VIP_CNTRL_1, priv->vip_cntrl_1);
                reg_write(priv, REG_VIP_CNTRL_2, priv->vip_cntrl_2);

                priv->is_on = true;
        } else {
                /* disable video ports */
                reg_write(priv, REG_ENA_VP_0, 0x00);
                reg_write(priv, REG_ENA_VP_1, 0x00);
                reg_write(priv, REG_ENA_VP_2, 0x00);

                priv->is_on = false;
        }
}

static void
tda998x_encoder_mode_set(struct drm_encoder *encoder,
                         struct drm_display_mode *mode,
                         struct drm_display_mode *adjusted_mode)
{
        struct tda998x_priv *priv = enc_to_tda998x_priv(encoder);
        u16 ref_pix, ref_line, n_pix, n_line;
        u16 hs_pix_s, hs_pix_e;
        u16 vs1_pix_s, vs1_pix_e, vs1_line_s, vs1_line_e;
        u16 vs2_pix_s, vs2_pix_e, vs2_line_s, vs2_line_e;
        u16 vwin1_line_s, vwin1_line_e;
        u16 vwin2_line_s, vwin2_line_e;
        u16 de_pix_s, de_pix_e;
        u8 reg, div, rep;

        /*
         * Internally TDA998x is using ITU-R BT.656 style sync but
         * we get VESA style sync. TDA998x is using a reference pixel
         * relative to ITU to sync to the input frame and for output
         * sync generation. Currently, we are using reference detection
         * from HS/VS, i.e. REFPIX/REFLINE denote frame start sync point
         * which is position of rising VS with coincident rising HS.
         *
         * Now there is some issues to take care of:
         * - HDMI data islands require sync-before-active
         * - TDA998x register values must be > 0 to be enabled
         * - REFLINE needs an additional offset of +1
         * - REFPIX needs an addtional offset of +1 for UYUV and +3 for RGB
         *
         * So we add +1 to all horizontal and vertical register values,
         * plus an additional +3 for REFPIX as we are using RGB input only.
         */
        n_pix        = mode->htotal;
        n_line       = mode->vtotal;

        hs_pix_e     = mode->hsync_end - mode->hdisplay;
        hs_pix_s     = mode->hsync_start - mode->hdisplay;
        de_pix_e     = mode->htotal;
        de_pix_s     = mode->htotal - mode->hdisplay;
        ref_pix      = 3 + hs_pix_s;

        /*
         * Attached LCD controllers may generate broken sync. Allow
         * those to adjust the position of the rising VS edge by adding
         * HSKEW to ref_pix.
         */
        if (adjusted_mode->flags & DRM_MODE_FLAG_HSKEW)
                ref_pix += adjusted_mode->hskew;

        if ((mode->flags & DRM_MODE_FLAG_INTERLACE) == 0) {
                ref_line     = 1 + mode->vsync_start - mode->vdisplay;
                vwin1_line_s = mode->vtotal - mode->vdisplay - 1;
                vwin1_line_e = vwin1_line_s + mode->vdisplay;
                vs1_pix_s    = vs1_pix_e = hs_pix_s;
                vs1_line_s   = mode->vsync_start - mode->vdisplay;
                vs1_line_e   = vs1_line_s +
                               mode->vsync_end - mode->vsync_start;
                vwin2_line_s = vwin2_line_e = 0;
                vs2_pix_s    = vs2_pix_e  = 0;
                vs2_line_s   = vs2_line_e = 0;
        } else {
                ref_line     = 1 + (mode->vsync_start - mode->vdisplay)/2;
                vwin1_line_s = (mode->vtotal - mode->vdisplay)/2;
                vwin1_line_e = vwin1_line_s + mode->vdisplay/2;
                vs1_pix_s    = vs1_pix_e = hs_pix_s;
                vs1_line_s   = (mode->vsync_start - mode->vdisplay)/2;
                vs1_line_e   = vs1_line_s +
                               (mode->vsync_end - mode->vsync_start)/2;
                vwin2_line_s = vwin1_line_s + mode->vtotal/2;
                vwin2_line_e = vwin2_line_s + mode->vdisplay/2;
                vs2_pix_s    = vs2_pix_e = hs_pix_s + mode->htotal/2;
                vs2_line_s   = vs1_line_s + mode->vtotal/2 ;
                vs2_line_e   = vs2_line_s +
                               (mode->vsync_end - mode->vsync_start)/2;
        }

        div = 148500 / mode->clock;
        if (div != 0) {
                div--;
                if (div > 3)
                        div = 3;
        }

        mutex_lock(&priv->audio_mutex);

        /* mute the audio FIFO: */
        reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO);

        /* set HDMI HDCP mode off: */
        reg_write(priv, REG_TBG_CNTRL_1, TBG_CNTRL_1_DWIN_DIS);
        reg_clear(priv, REG_TX33, TX33_HDMI);
        reg_write(priv, REG_ENC_CNTRL, ENC_CNTRL_CTL_CODE(0));

        /* no pre-filter or interpolator: */
        reg_write(priv, REG_HVF_CNTRL_0, HVF_CNTRL_0_PREFIL(0) |
                        HVF_CNTRL_0_INTPOL(0));
        reg_set(priv, REG_FEAT_POWERDOWN, FEAT_POWERDOWN_PREFILT);
        reg_write(priv, REG_VIP_CNTRL_5, VIP_CNTRL_5_SP_CNT(0));
        reg_write(priv, REG_VIP_CNTRL_4, VIP_CNTRL_4_BLANKIT(0) |
                        VIP_CNTRL_4_BLC(0));

        reg_clear(priv, REG_PLL_SERIAL_1, PLL_SERIAL_1_SRL_MAN_IZ);
        reg_clear(priv, REG_PLL_SERIAL_3, PLL_SERIAL_3_SRL_CCIR |
                                          PLL_SERIAL_3_SRL_DE);
        reg_write(priv, REG_SERIALIZER, 0);
        reg_write(priv, REG_HVF_CNTRL_1, HVF_CNTRL_1_VQR(0));

        /* TODO enable pixel repeat for pixel rates less than 25Msamp/s */
        rep = 0;
        reg_write(priv, REG_RPT_CNTRL, 0);
        reg_write(priv, REG_SEL_CLK, SEL_CLK_SEL_VRF_CLK(0) |
                        SEL_CLK_SEL_CLK1 | SEL_CLK_ENA_SC_CLK);

        reg_write(priv, REG_PLL_SERIAL_2, PLL_SERIAL_2_SRL_NOSC(div) |
                        PLL_SERIAL_2_SRL_PR(rep));

        /* set color matrix bypass flag: */
        reg_write(priv, REG_MAT_CONTRL, MAT_CONTRL_MAT_BP |
                                MAT_CONTRL_MAT_SC(1));
        reg_set(priv, REG_FEAT_POWERDOWN, FEAT_POWERDOWN_CSC);

        /* set BIAS tmds value: */
        reg_write(priv, REG_ANA_GENERAL, 0x09);

        /*
         * Sync on rising HSYNC/VSYNC
         */
        reg = VIP_CNTRL_3_SYNC_HS;

        /*
         * TDA19988 requires high-active sync at input stage,
         * so invert low-active sync provided by master encoder here
         */
        if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                reg |= VIP_CNTRL_3_H_TGL;
        if (mode->flags & DRM_MODE_FLAG_NVSYNC)
                reg |= VIP_CNTRL_3_V_TGL;
        reg_write(priv, REG_VIP_CNTRL_3, reg);

        reg_write(priv, REG_VIDFORMAT, 0x00);
        reg_write16(priv, REG_REFPIX_MSB, ref_pix);
        reg_write16(priv, REG_REFLINE_MSB, ref_line);
        reg_write16(priv, REG_NPIX_MSB, n_pix);
        reg_write16(priv, REG_NLINE_MSB, n_line);
        reg_write16(priv, REG_VS_LINE_STRT_1_MSB, vs1_line_s);
        reg_write16(priv, REG_VS_PIX_STRT_1_MSB, vs1_pix_s);
        reg_write16(priv, REG_VS_LINE_END_1_MSB, vs1_line_e);
        reg_write16(priv, REG_VS_PIX_END_1_MSB, vs1_pix_e);
        reg_write16(priv, REG_VS_LINE_STRT_2_MSB, vs2_line_s);
        reg_write16(priv, REG_VS_PIX_STRT_2_MSB, vs2_pix_s);
        reg_write16(priv, REG_VS_LINE_END_2_MSB, vs2_line_e);
        reg_write16(priv, REG_VS_PIX_END_2_MSB, vs2_pix_e);
        reg_write16(priv, REG_HS_PIX_START_MSB, hs_pix_s);
        reg_write16(priv, REG_HS_PIX_STOP_MSB, hs_pix_e);
        reg_write16(priv, REG_VWIN_START_1_MSB, vwin1_line_s);
        reg_write16(priv, REG_VWIN_END_1_MSB, vwin1_line_e);
        reg_write16(priv, REG_VWIN_START_2_MSB, vwin2_line_s);
        reg_write16(priv, REG_VWIN_END_2_MSB, vwin2_line_e);
        reg_write16(priv, REG_DE_START_MSB, de_pix_s);
        reg_write16(priv, REG_DE_STOP_MSB, de_pix_e);

        if (priv->rev == TDA19988) {
                /* let incoming pixels fill the active space (if any) */
                reg_write(priv, REG_ENABLE_SPACE, 0x00);
        }

        /*
         * Always generate sync polarity relative to input sync and
         * revert input stage toggled sync at output stage
         */
        reg = TBG_CNTRL_1_DWIN_DIS | TBG_CNTRL_1_TGL_EN;
        if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                reg |= TBG_CNTRL_1_H_TGL;
        if (mode->flags & DRM_MODE_FLAG_NVSYNC)
                reg |= TBG_CNTRL_1_V_TGL;
        reg_write(priv, REG_TBG_CNTRL_1, reg);

        /* must be last register set: */
        reg_write(priv, REG_TBG_CNTRL_0, 0);

        priv->tmds_clock = adjusted_mode->clock;

        /* CEA-861B section 6 says that:
         * CEA version 1 (CEA-861) has no support for infoframes.
         * CEA version 2 (CEA-861A) supports version 1 AVI infoframes,
         * and optional basic audio.
         * CEA version 3 (CEA-861B) supports version 1 and 2 AVI infoframes,
         * and optional digital audio, with audio infoframes.
         *
         * Since we only support generation of version 2 AVI infoframes,
         * ignore CEA version 2 and below (iow, behave as if we're a
         * CEA-861 source.)
         */
        priv->supports_infoframes = priv->connector.display_info.cea_rev >= 3;

        if (priv->supports_infoframes) {
                /* We need to turn HDMI HDCP stuff on to get audio through */
                reg &= ~TBG_CNTRL_1_DWIN_DIS;
                reg_write(priv, REG_TBG_CNTRL_1, reg);
                reg_write(priv, REG_ENC_CNTRL, ENC_CNTRL_CTL_CODE(1));
                reg_set(priv, REG_TX33, TX33_HDMI);

                tda998x_write_avi(priv, adjusted_mode);

                if (priv->audio_params.format != AFMT_UNUSED &&
                    priv->sink_has_audio)
                        tda998x_configure_audio(priv, &priv->audio_params);
        }

        mutex_unlock(&priv->audio_mutex);
}

static void tda998x_destroy(struct tda998x_priv *priv)
{
        /* disable all IRQs and free the IRQ handler */
        cec_write(priv, REG_CEC_RXSHPDINTENA, 0);
        reg_clear(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);

        if (priv->audio_pdev)
                platform_device_unregister(priv->audio_pdev);

        if (priv->hdmi->irq)
                free_irq(priv->hdmi->irq, priv);

        del_timer_sync(&priv->edid_delay_timer);
        cancel_work_sync(&priv->detect_work);

        i2c_unregister_device(priv->cec);
}

/* I2C driver functions */

static int tda998x_get_audio_ports(struct tda998x_priv *priv,
                                   struct device_node *np)
{
        const u32 *port_data;
        u32 size;
        int i;

        port_data = of_get_property(np, "audio-ports", &size);
        if (!port_data)
                return 0;

        size /= sizeof(u32);
        if (size > 2 * ARRAY_SIZE(priv->audio_port) || size % 2 != 0) {
                dev_err(&priv->hdmi->dev,
                        "Bad number of elements in audio-ports dt-property\n");
                return -EINVAL;
        }

        size /= 2;

        for (i = 0; i < size; i++) {
                u8 afmt = be32_to_cpup(&port_data[2*i]);
                u8 ena_ap = be32_to_cpup(&port_data[2*i+1]);

                if (afmt != AFMT_SPDIF && afmt != AFMT_I2S) {
                        dev_err(&priv->hdmi->dev,
                                "Bad audio format %u\n", afmt);
                        return -EINVAL;
                }

                priv->audio_port[i].format = afmt;
                priv->audio_port[i].config = ena_ap;
        }

        if (priv->audio_port[0].format == priv->audio_port[1].format) {
                dev_err(&priv->hdmi->dev,
                        "There can only be on I2S port and one SPDIF port\n");
                return -EINVAL;
        }
        return 0;
}

static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
{
        struct device_node *np = client->dev.of_node;
        u32 video;
        int rev_lo, rev_hi, ret;

        mutex_init(&priv->audio_mutex); /* Protect access from audio thread */

        priv->vip_cntrl_0 = VIP_CNTRL_0_SWAP_A(2) | VIP_CNTRL_0_SWAP_B(3);
        priv->vip_cntrl_1 = VIP_CNTRL_1_SWAP_C(0) | VIP_CNTRL_1_SWAP_D(1);
        priv->vip_cntrl_2 = VIP_CNTRL_2_SWAP_E(4) | VIP_CNTRL_2_SWAP_F(5);

        /* CEC I2C address bound to TDA998x I2C addr by configuration pins */
        priv->cec_addr = 0x34 + (client->addr & 0x03);
        priv->current_page = 0xff;
        priv->hdmi = client;
        priv->cec = i2c_new_dummy(client->adapter, priv->cec_addr);
        if (!priv->cec)
                return -ENODEV;

        mutex_init(&priv->mutex);       /* protect the page access */
        init_waitqueue_head(&priv->edid_delay_waitq);
        setup_timer(&priv->edid_delay_timer, tda998x_edid_delay_done,
                    (unsigned long)priv);
        INIT_WORK(&priv->detect_work, tda998x_detect_work);

        /* wake up the device: */
        cec_write(priv, REG_CEC_ENAMODS,
                        CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI);

        tda998x_reset(priv);

        /* read version: */
        rev_lo = reg_read(priv, REG_VERSION_LSB);
        rev_hi = reg_read(priv, REG_VERSION_MSB);
        if (rev_lo < 0 || rev_hi < 0) {
                ret = rev_lo < 0 ? rev_lo : rev_hi;
                goto fail;
        }

        priv->rev = rev_lo | rev_hi << 8;

        /* mask off feature bits: */
        priv->rev &= ~0x30; /* not-hdcp and not-scalar bit */

        switch (priv->rev) {
        case TDA9989N2:
                dev_info(&client->dev, "found TDA9989 n2");
                break;
        case TDA19989:
                dev_info(&client->dev, "found TDA19989");
                break;
        case TDA19989N2:
                dev_info(&client->dev, "found TDA19989 n2");
                break;
        case TDA19988:
                dev_info(&client->dev, "found TDA19988");
                break;
        default:
                dev_err(&client->dev, "found unsupported device: %04x\n",
                        priv->rev);
                goto fail;
        }

        /* after reset, enable DDC: */
        reg_write(priv, REG_DDC_DISABLE, 0x00);

        /* set clock on DDC channel: */
        reg_write(priv, REG_TX3, 39);

        /* if necessary, disable multi-master: */
        if (priv->rev == TDA19989)
                reg_set(priv, REG_I2C_MASTER, I2C_MASTER_DIS_MM);

        cec_write(priv, REG_CEC_FRO_IM_CLK_CTRL,
                        CEC_FRO_IM_CLK_CTRL_GHOST_DIS | CEC_FRO_IM_CLK_CTRL_IMCLK_SEL);

        /* initialize the optional IRQ */
        if (client->irq) {
                unsigned long irq_flags;

                /* init read EDID waitqueue and HDP work */
                init_waitqueue_head(&priv->wq_edid);

                /* clear pending interrupts */
                reg_read(priv, REG_INT_FLAGS_0);
                reg_read(priv, REG_INT_FLAGS_1);
                reg_read(priv, REG_INT_FLAGS_2);

                irq_flags =
                        irqd_get_trigger_type(irq_get_irq_data(client->irq));
                irq_flags |= IRQF_SHARED | IRQF_ONESHOT;
                ret = request_threaded_irq(client->irq, NULL,
                                           tda998x_irq_thread, irq_flags,
                                           "tda998x", priv);
                if (ret) {
                        dev_err(&client->dev,
                                "failed to request IRQ#%u: %d\n",
                                client->irq, ret);
                        goto fail;
                }

                /* enable HPD irq */
                cec_write(priv, REG_CEC_RXSHPDINTENA, CEC_RXSHPDLEV_HPD);
        }

        /* enable EDID read irq: */
        reg_set(priv, REG_INT_FLAGS_2, INT_FLAGS_2_EDID_BLK_RD);

        if (!np)
                return 0;               /* non-DT */

        /* get the device tree parameters */
        ret = of_property_read_u32(np, "video-ports", &video);
        if (ret == 0) {
                priv->vip_cntrl_0 = video >> 16;
                priv->vip_cntrl_1 = video >> 8;
                priv->vip_cntrl_2 = video;
        }

        ret = tda998x_get_audio_ports(priv, np);
        if (ret)
                goto fail;

        if (priv->audio_port[0].format != AFMT_UNUSED)
                tda998x_audio_codec_init(priv, &client->dev);

        return 0;
fail:
        /* if encoder_init fails, the encoder slave is never registered,
         * so cleanup here:
         */
        if (priv->cec)
                i2c_unregister_device(priv->cec);
        return -ENXIO;
}

static void tda998x_encoder_prepare(struct drm_encoder *encoder)
{
        tda998x_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}

static void tda998x_encoder_commit(struct drm_encoder *encoder)
{
        tda998x_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}

static const struct drm_encoder_helper_funcs tda998x_encoder_helper_funcs = {
        .dpms = tda998x_encoder_dpms,
        .prepare = tda998x_encoder_prepare,
        .commit = tda998x_encoder_commit,
        .mode_set = tda998x_encoder_mode_set,
};

static void tda998x_encoder_destroy(struct drm_encoder *encoder)
{
        struct tda998x_priv *priv = enc_to_tda998x_priv(encoder);

        tda998x_destroy(priv);
        drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs tda998x_encoder_funcs = {
        .destroy = tda998x_encoder_destroy,
};

static void tda998x_set_config(struct tda998x_priv *priv,
                               const struct tda998x_encoder_params *p)
{
        priv->vip_cntrl_0 = VIP_CNTRL_0_SWAP_A(p->swap_a) |
                            (p->mirr_a ? VIP_CNTRL_0_MIRR_A : 0) |
                            VIP_CNTRL_0_SWAP_B(p->swap_b) |
                            (p->mirr_b ? VIP_CNTRL_0_MIRR_B : 0);
        priv->vip_cntrl_1 = VIP_CNTRL_1_SWAP_C(p->swap_c) |
                            (p->mirr_c ? VIP_CNTRL_1_MIRR_C : 0) |
                            VIP_CNTRL_1_SWAP_D(p->swap_d) |
                            (p->mirr_d ? VIP_CNTRL_1_MIRR_D : 0);
        priv->vip_cntrl_2 = VIP_CNTRL_2_SWAP_E(p->swap_e) |
                            (p->mirr_e ? VIP_CNTRL_2_MIRR_E : 0) |
                            VIP_CNTRL_2_SWAP_F(p->swap_f) |
                            (p->mirr_f ? VIP_CNTRL_2_MIRR_F : 0);

        priv->audio_params = p->audio_params;
}

static int tda998x_bind(struct device *dev, struct device *master, void *data)
{
        struct tda998x_encoder_params *params = dev->platform_data;
        struct i2c_client *client = to_i2c_client(dev);
        struct drm_device *drm = data;
        struct tda998x_priv *priv;
        u32 crtcs = 0;
        int ret;

        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        dev_set_drvdata(dev, priv);

        if (dev->of_node)
                crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);

        /* If no CRTCs were found, fall back to our old behaviour */
        if (crtcs == 0) {
                dev_warn(dev, "Falling back to first CRTC\n");
                crtcs = 1 << 0;
        }

        priv->encoder.possible_crtcs = crtcs;

        ret = tda998x_create(client, priv);
        if (ret)
                return ret;

        if (!dev->of_node && params)
                tda998x_set_config(priv, params);

        drm_encoder_helper_add(&priv->encoder, &tda998x_encoder_helper_funcs);
        ret = drm_encoder_init(drm, &priv->encoder, &tda998x_encoder_funcs,
                               DRM_MODE_ENCODER_TMDS, NULL);
        if (ret)
                goto err_encoder;

        ret = tda998x_connector_init(priv, drm);
        if (ret)
                goto err_connector;

        return 0;

err_connector:
        drm_encoder_cleanup(&priv->encoder);
err_encoder:
        tda998x_destroy(priv);
        return ret;
}

static void tda998x_unbind(struct device *dev, struct device *master,
                           void *data)
{
        struct tda998x_priv *priv = dev_get_drvdata(dev);

        drm_connector_cleanup(&priv->connector);
        drm_encoder_cleanup(&priv->encoder);
        tda998x_destroy(priv);
}

static const struct component_ops tda998x_ops = {
        .bind = tda998x_bind,
        .unbind = tda998x_unbind,
};

static int
tda998x_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
                dev_warn(&client->dev, "adapter does not support I2C\n");
                return -EIO;
        }
        return component_add(&client->dev, &tda998x_ops);
}

static int tda998x_remove(struct i2c_client *client)
{
        component_del(&client->dev, &tda998x_ops);
        return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id tda998x_dt_ids[] = {
        { .compatible = "nxp,tda998x", },
        { }
};
MODULE_DEVICE_TABLE(of, tda998x_dt_ids);
#endif

static struct i2c_device_id tda998x_ids[] = {
        { "tda998x", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, tda998x_ids);

static struct i2c_driver tda998x_driver = {
        .probe = tda998x_probe,
        .remove = tda998x_remove,
        .driver = {
                .name = "tda998x",
                .of_match_table = of_match_ptr(tda998x_dt_ids),
        },
        .id_table = tda998x_ids,
};

module_i2c_driver(tda998x_driver);

MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
MODULE_DESCRIPTION("NXP Semiconductors TDA998X HDMI Encoder");
MODULE_LICENSE("GPL");