/*
 *
 *  hda_intel.c - Implementation of primary alsa driver code base
 *                for Intel HD Audio.
 *
 *  Copyright(c) 2004 Intel Corporation. All rights reserved.
 *
 *  Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
 *                     PeiSen Hou <pshou@realtek.com.tw>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  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, write to the Free Software Foundation, Inc., 59
 *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *  CONTACTS:
 *
 *  Matt Jared          matt.jared@intel.com
 *  Andy Kopp           andy.kopp@intel.com
 *  Dan Kogan           dan.d.kogan@intel.com
 *
 *  CHANGES:
 *
 *  2004.12.01  Major rewrite by tiwai, merged the work of pshou
 * 
 */

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/clocksource.h>
#include <linux/time.h>
#include <linux/completion.h>

#ifdef CONFIG_X86
/* for snoop control */
#include <asm/pgtable.h>
#include <asm/set_memory.h>
#include <asm/cpufeature.h>
#endif
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/hdaudio.h>
#include <sound/hda_i915.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include <linux/firmware.h>
#include "hda_codec.h"
#include "hda_controller.h"
#include "hda_intel.h"

#define CREATE_TRACE_POINTS
#include "hda_intel_trace.h"

/* position fix mode */
enum {
        POS_FIX_AUTO,
        POS_FIX_LPIB,
        POS_FIX_POSBUF,
        POS_FIX_VIACOMBO,
        POS_FIX_COMBO,
        POS_FIX_SKL,
};

/* Defines for ATI HD Audio support in SB450 south bridge */
#define ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR   0x42
#define ATI_SB450_HDAUDIO_ENABLE_SNOOP      0x02

/* Defines for Nvidia HDA support */
#define NVIDIA_HDA_TRANSREG_ADDR      0x4e
#define NVIDIA_HDA_ENABLE_COHBITS     0x0f
#define NVIDIA_HDA_ISTRM_COH          0x4d
#define NVIDIA_HDA_OSTRM_COH          0x4c
#define NVIDIA_HDA_ENABLE_COHBIT      0x01

/* Defines for Intel SCH HDA snoop control */
#define INTEL_HDA_CGCTL  0x48
#define INTEL_HDA_CGCTL_MISCBDCGE        (0x1 << 6)
#define INTEL_SCH_HDA_DEVC      0x78
#define INTEL_SCH_HDA_DEVC_NOSNOOP       (0x1<<11)

/* Define IN stream 0 FIFO size offset in VIA controller */
#define VIA_IN_STREAM0_FIFO_SIZE_OFFSET 0x90
/* Define VIA HD Audio Device ID*/
#define VIA_HDAC_DEVICE_ID              0x3288

/* max number of SDs */
/* ICH, ATI and VIA have 4 playback and 4 capture */
#define ICH6_NUM_CAPTURE        4
#define ICH6_NUM_PLAYBACK       4

/* ULI has 6 playback and 5 capture */
#define ULI_NUM_CAPTURE         5
#define ULI_NUM_PLAYBACK        6

/* ATI HDMI may have up to 8 playbacks and 0 capture */
#define ATIHDMI_NUM_CAPTURE     0
#define ATIHDMI_NUM_PLAYBACK    8

/* TERA has 4 playback and 3 capture */
#define TERA_NUM_CAPTURE        3
#define TERA_NUM_PLAYBACK       4


static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
static char *model[SNDRV_CARDS];
static int position_fix[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = -1};
static int bdl_pos_adj[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = -1};
static int probe_mask[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = -1};
static int probe_only[SNDRV_CARDS];
static int jackpoll_ms[SNDRV_CARDS];
static int single_cmd = -1;
static int enable_msi = -1;
#ifdef CONFIG_SND_HDA_PATCH_LOADER
static char *patch[SNDRV_CARDS];
#endif
#ifdef CONFIG_SND_HDA_INPUT_BEEP
static bool beep_mode[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] =
                                        CONFIG_SND_HDA_INPUT_BEEP_MODE};
#endif

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for Intel HD audio interface.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable Intel HD audio interface.");
module_param_array(model, charp, NULL, 0444);
MODULE_PARM_DESC(model, "Use the given board model.");
module_param_array(position_fix, int, NULL, 0444);
MODULE_PARM_DESC(position_fix, "DMA pointer read method."
                 "(-1 = system default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO, 5 = SKL+).");
module_param_array(bdl_pos_adj, int, NULL, 0644);
MODULE_PARM_DESC(bdl_pos_adj, "BDL position adjustment offset.");
module_param_array(probe_mask, int, NULL, 0444);
MODULE_PARM_DESC(probe_mask, "Bitmask to probe codecs (default = -1).");
module_param_array(probe_only, int, NULL, 0444);
MODULE_PARM_DESC(probe_only, "Only probing and no codec initialization.");
module_param_array(jackpoll_ms, int, NULL, 0444);
MODULE_PARM_DESC(jackpoll_ms, "Ms between polling for jack events (default = 0, using unsol events only)");
module_param(single_cmd, bint, 0444);
MODULE_PARM_DESC(single_cmd, "Use single command to communicate with codecs "
                 "(for debugging only).");
module_param(enable_msi, bint, 0444);
MODULE_PARM_DESC(enable_msi, "Enable Message Signaled Interrupt (MSI)");
#ifdef CONFIG_SND_HDA_PATCH_LOADER
module_param_array(patch, charp, NULL, 0444);
MODULE_PARM_DESC(patch, "Patch file for Intel HD audio interface.");
#endif
#ifdef CONFIG_SND_HDA_INPUT_BEEP
module_param_array(beep_mode, bool, NULL, 0444);
MODULE_PARM_DESC(beep_mode, "Select HDA Beep registration mode "
                            "(0=off, 1=on) (default=1).");
#endif

#ifdef CONFIG_PM
static int param_set_xint(const char *val, const struct kernel_param *kp);
static const struct kernel_param_ops param_ops_xint = {
        .set = param_set_xint,
        .get = param_get_int,
};
#define param_check_xint param_check_int

static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
module_param(power_save, xint, 0644);
MODULE_PARM_DESC(power_save, "Automatic power-saving timeout "
                 "(in second, 0 = disable).");

/* reset the HD-audio controller in power save mode.
 * this may give more power-saving, but will take longer time to
 * wake up.
 */
static bool power_save_controller = 1;
module_param(power_save_controller, bool, 0644);
MODULE_PARM_DESC(power_save_controller, "Reset controller in power save mode.");
#else
#define power_save      0
#endif /* CONFIG_PM */

static int align_buffer_size = -1;
module_param(align_buffer_size, bint, 0644);
MODULE_PARM_DESC(align_buffer_size,
                "Force buffer and period sizes to be multiple of 128 bytes.");

#ifdef CONFIG_X86
static int hda_snoop = -1;
module_param_named(snoop, hda_snoop, bint, 0444);
MODULE_PARM_DESC(snoop, "Enable/disable snooping");
#else
#define hda_snoop               true
#endif


MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Intel, ICH6},"
                         "{Intel, ICH6M},"
                         "{Intel, ICH7},"
                         "{Intel, ESB2},"
                         "{Intel, ICH8},"
                         "{Intel, ICH9},"
                         "{Intel, ICH10},"
                         "{Intel, PCH},"
                         "{Intel, CPT},"
                         "{Intel, PPT},"
                         "{Intel, LPT},"
                         "{Intel, LPT_LP},"
                         "{Intel, WPT_LP},"
                         "{Intel, SPT},"
                         "{Intel, SPT_LP},"
                         "{Intel, HPT},"
                         "{Intel, PBG},"
                         "{Intel, SCH},"
                         "{ATI, SB450},"
                         "{ATI, SB600},"
                         "{ATI, RS600},"
                         "{ATI, RS690},"
                         "{ATI, RS780},"
                         "{ATI, R600},"
                         "{ATI, RV630},"
                         "{ATI, RV610},"
                         "{ATI, RV670},"
                         "{ATI, RV635},"
                         "{ATI, RV620},"
                         "{ATI, RV770},"
                         "{VIA, VT8251},"
                         "{VIA, VT8237A},"
                         "{SiS, SIS966},"
                         "{ULI, M5461}}");
MODULE_DESCRIPTION("Intel HDA driver");

#if defined(CONFIG_PM) && defined(CONFIG_VGA_SWITCHEROO)
#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
#define SUPPORT_VGA_SWITCHEROO
#endif
#endif


/*
 */

/* driver types */
enum {
        AZX_DRIVER_ICH,
        AZX_DRIVER_PCH,
        AZX_DRIVER_SCH,
        AZX_DRIVER_SKL,
        AZX_DRIVER_HDMI,
        AZX_DRIVER_ATI,
        AZX_DRIVER_ATIHDMI,
        AZX_DRIVER_ATIHDMI_NS,
        AZX_DRIVER_VIA,
        AZX_DRIVER_SIS,
        AZX_DRIVER_ULI,
        AZX_DRIVER_NVIDIA,
        AZX_DRIVER_TERA,
        AZX_DRIVER_CTX,
        AZX_DRIVER_CTHDA,
        AZX_DRIVER_CMEDIA,
        AZX_DRIVER_GENERIC,
        AZX_NUM_DRIVERS, /* keep this as last entry */
};

#define azx_get_snoop_type(chip) \
        (((chip)->driver_caps & AZX_DCAPS_SNOOP_MASK) >> 10)
#define AZX_DCAPS_SNOOP_TYPE(type) ((AZX_SNOOP_TYPE_ ## type) << 10)

/* quirks for old Intel chipsets */
#define AZX_DCAPS_INTEL_ICH \
        (AZX_DCAPS_OLD_SSYNC | AZX_DCAPS_NO_ALIGN_BUFSIZE)

/* quirks for Intel PCH */
#define AZX_DCAPS_INTEL_PCH_BASE \
        (AZX_DCAPS_NO_ALIGN_BUFSIZE | AZX_DCAPS_COUNT_LPIB_DELAY |\
         AZX_DCAPS_SNOOP_TYPE(SCH))

/* PCH up to IVB; no runtime PM; bind with i915 gfx */
#define AZX_DCAPS_INTEL_PCH_NOPM \
        (AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_I915_COMPONENT)

/* PCH for HSW/BDW; with runtime PM */
/* no i915 binding for this as HSW/BDW has another controller for HDMI */
#define AZX_DCAPS_INTEL_PCH \
        (AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_PM_RUNTIME)

/* HSW HDMI */
#define AZX_DCAPS_INTEL_HASWELL \
        (/*AZX_DCAPS_ALIGN_BUFSIZE |*/ AZX_DCAPS_COUNT_LPIB_DELAY |\
         AZX_DCAPS_PM_RUNTIME | AZX_DCAPS_I915_COMPONENT |\
         AZX_DCAPS_I915_POWERWELL | AZX_DCAPS_SNOOP_TYPE(SCH))

/* Broadwell HDMI can't use position buffer reliably, force to use LPIB */
#define AZX_DCAPS_INTEL_BROADWELL \
        (/*AZX_DCAPS_ALIGN_BUFSIZE |*/ AZX_DCAPS_POSFIX_LPIB |\
         AZX_DCAPS_PM_RUNTIME | AZX_DCAPS_I915_COMPONENT |\
         AZX_DCAPS_I915_POWERWELL | AZX_DCAPS_SNOOP_TYPE(SCH))

#define AZX_DCAPS_INTEL_BAYTRAIL \
        (AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_I915_COMPONENT |\
         AZX_DCAPS_I915_POWERWELL)

#define AZX_DCAPS_INTEL_BRASWELL \
        (AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_PM_RUNTIME |\
         AZX_DCAPS_I915_COMPONENT | AZX_DCAPS_I915_POWERWELL)

#define AZX_DCAPS_INTEL_SKYLAKE \
        (AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_PM_RUNTIME |\
         AZX_DCAPS_SEPARATE_STREAM_TAG | AZX_DCAPS_I915_COMPONENT |\
         AZX_DCAPS_I915_POWERWELL)

#define AZX_DCAPS_INTEL_BROXTON \
        (AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_PM_RUNTIME |\
         AZX_DCAPS_SEPARATE_STREAM_TAG | AZX_DCAPS_I915_COMPONENT |\
         AZX_DCAPS_I915_POWERWELL)

/* quirks for ATI SB / AMD Hudson */
#define AZX_DCAPS_PRESET_ATI_SB \
        (AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB |\
         AZX_DCAPS_SNOOP_TYPE(ATI))

/* quirks for ATI/AMD HDMI */
#define AZX_DCAPS_PRESET_ATI_HDMI \
        (AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB|\
         AZX_DCAPS_NO_MSI64)

/* quirks for ATI HDMI with snoop off */
#define AZX_DCAPS_PRESET_ATI_HDMI_NS \
        (AZX_DCAPS_PRESET_ATI_HDMI | AZX_DCAPS_SNOOP_OFF)

/* quirks for Nvidia */
#define AZX_DCAPS_PRESET_NVIDIA \
        (AZX_DCAPS_NO_MSI | AZX_DCAPS_CORBRP_SELF_CLEAR |\
         AZX_DCAPS_SNOOP_TYPE(NVIDIA))

#define AZX_DCAPS_PRESET_CTHDA \
        (AZX_DCAPS_NO_MSI | AZX_DCAPS_POSFIX_LPIB |\
         AZX_DCAPS_NO_64BIT |\
         AZX_DCAPS_4K_BDLE_BOUNDARY | AZX_DCAPS_SNOOP_OFF)

/*
 * vga_switcheroo support
 */
#ifdef SUPPORT_VGA_SWITCHEROO
#define use_vga_switcheroo(chip)        ((chip)->use_vga_switcheroo)
#else
#define use_vga_switcheroo(chip)        0
#endif

#define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) || \
                                        ((pci)->device == 0x0c0c) || \
                                        ((pci)->device == 0x0d0c) || \
                                        ((pci)->device == 0x160c))

#define IS_BXT(pci) ((pci)->vendor == 0x8086 && (pci)->device == 0x5a98)

static char *driver_short_names[] = {
        [AZX_DRIVER_ICH] = "HDA Intel",
        [AZX_DRIVER_PCH] = "HDA Intel PCH",
        [AZX_DRIVER_SCH] = "HDA Intel MID",
        [AZX_DRIVER_SKL] = "HDA Intel PCH", /* kept old name for compatibility */
        [AZX_DRIVER_HDMI] = "HDA Intel HDMI",
        [AZX_DRIVER_ATI] = "HDA ATI SB",
        [AZX_DRIVER_ATIHDMI] = "HDA ATI HDMI",
        [AZX_DRIVER_ATIHDMI_NS] = "HDA ATI HDMI",
        [AZX_DRIVER_VIA] = "HDA VIA VT82xx",
        [AZX_DRIVER_SIS] = "HDA SIS966",
        [AZX_DRIVER_ULI] = "HDA ULI M5461",
        [AZX_DRIVER_NVIDIA] = "HDA NVidia",
        [AZX_DRIVER_TERA] = "HDA Teradici", 
        [AZX_DRIVER_CTX] = "HDA Creative", 
        [AZX_DRIVER_CTHDA] = "HDA Creative",
        [AZX_DRIVER_CMEDIA] = "HDA C-Media",
        [AZX_DRIVER_GENERIC] = "HD-Audio Generic",
};

#ifdef CONFIG_X86
static void __mark_pages_wc(struct azx *chip, struct snd_dma_buffer *dmab, bool on)
{
        int pages;

        if (azx_snoop(chip))
                return;
        if (!dmab || !dmab->area || !dmab->bytes)
                return;

#ifdef CONFIG_SND_DMA_SGBUF
        if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_SG) {
                struct snd_sg_buf *sgbuf = dmab->private_data;
                if (chip->driver_type == AZX_DRIVER_CMEDIA)
                        return; /* deal with only CORB/RIRB buffers */
                if (on)
                        set_pages_array_wc(sgbuf->page_table, sgbuf->pages);
                else
                        set_pages_array_wb(sgbuf->page_table, sgbuf->pages);
                return;
        }
#endif

        pages = (dmab->bytes + PAGE_SIZE - 1) >> PAGE_SHIFT;
        if (on)
                set_memory_wc((unsigned long)dmab->area, pages);
        else
                set_memory_wb((unsigned long)dmab->area, pages);
}

static inline void mark_pages_wc(struct azx *chip, struct snd_dma_buffer *buf,
                                 bool on)
{
        __mark_pages_wc(chip, buf, on);
}
static inline void mark_runtime_wc(struct azx *chip, struct azx_dev *azx_dev,
                                   struct snd_pcm_substream *substream, bool on)
{
        if (azx_dev->wc_marked != on) {
                __mark_pages_wc(chip, snd_pcm_get_dma_buf(substream), on);
                azx_dev->wc_marked = on;
        }
}
#else
/* NOP for other archs */
static inline void mark_pages_wc(struct azx *chip, struct snd_dma_buffer *buf,
                                 bool on)
{
}
static inline void mark_runtime_wc(struct azx *chip, struct azx_dev *azx_dev,
                                   struct snd_pcm_substream *substream, bool on)
{
}
#endif

static int azx_acquire_irq(struct azx *chip, int do_disconnect);

/*
 * initialize the PCI registers
 */
/* update bits in a PCI register byte */
static void update_pci_byte(struct pci_dev *pci, unsigned int reg,
                            unsigned char mask, unsigned char val)
{
        unsigned char data;

        pci_read_config_byte(pci, reg, &data);
        data &= ~mask;
        data |= (val & mask);
        pci_write_config_byte(pci, reg, data);
}

static void azx_init_pci(struct azx *chip)
{
        int snoop_type = azx_get_snoop_type(chip);

        /* Clear bits 0-2 of PCI register TCSEL (at offset 0x44)
         * TCSEL == Traffic Class Select Register, which sets PCI express QOS
         * Ensuring these bits are 0 clears playback static on some HD Audio
         * codecs.
         * The PCI register TCSEL is defined in the Intel manuals.
         */
        if (!(chip->driver_caps & AZX_DCAPS_NO_TCSEL)) {
                dev_dbg(chip->card->dev, "Clearing TCSEL\n");
                update_pci_byte(chip->pci, AZX_PCIREG_TCSEL, 0x07, 0);
        }

        /* For ATI SB450/600/700/800/900 and AMD Hudson azalia HD audio,
         * we need to enable snoop.
         */
        if (snoop_type == AZX_SNOOP_TYPE_ATI) {
                dev_dbg(chip->card->dev, "Setting ATI snoop: %d\n",
                        azx_snoop(chip));
                update_pci_byte(chip->pci,
                                ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR, 0x07,
                                azx_snoop(chip) ? ATI_SB450_HDAUDIO_ENABLE_SNOOP : 0);
        }

        /* For NVIDIA HDA, enable snoop */
        if (snoop_type == AZX_SNOOP_TYPE_NVIDIA) {
                dev_dbg(chip->card->dev, "Setting Nvidia snoop: %d\n",
                        azx_snoop(chip));
                update_pci_byte(chip->pci,
                                NVIDIA_HDA_TRANSREG_ADDR,
                                0x0f, NVIDIA_HDA_ENABLE_COHBITS);
                update_pci_byte(chip->pci,
                                NVIDIA_HDA_ISTRM_COH,
                                0x01, NVIDIA_HDA_ENABLE_COHBIT);
                update_pci_byte(chip->pci,
                                NVIDIA_HDA_OSTRM_COH,
                                0x01, NVIDIA_HDA_ENABLE_COHBIT);
        }

        /* Enable SCH/PCH snoop if needed */
        if (snoop_type == AZX_SNOOP_TYPE_SCH) {
                unsigned short snoop;
                pci_read_config_word(chip->pci, INTEL_SCH_HDA_DEVC, &snoop);
                if ((!azx_snoop(chip) && !(snoop & INTEL_SCH_HDA_DEVC_NOSNOOP)) ||
                    (azx_snoop(chip) && (snoop & INTEL_SCH_HDA_DEVC_NOSNOOP))) {
                        snoop &= ~INTEL_SCH_HDA_DEVC_NOSNOOP;
                        if (!azx_snoop(chip))
                                snoop |= INTEL_SCH_HDA_DEVC_NOSNOOP;
                        pci_write_config_word(chip->pci, INTEL_SCH_HDA_DEVC, snoop);
                        pci_read_config_word(chip->pci,
                                INTEL_SCH_HDA_DEVC, &snoop);
                }
                dev_dbg(chip->card->dev, "SCH snoop: %s\n",
                        (snoop & INTEL_SCH_HDA_DEVC_NOSNOOP) ?
                        "Disabled" : "Enabled");
        }
}

/*
 * In BXT-P A0, HD-Audio DMA requests is later than expected,
 * and makes an audio stream sensitive to system latencies when
 * 24/32 bits are playing.
 * Adjusting threshold of DMA fifo to force the DMA request
 * sooner to improve latency tolerance at the expense of power.
 */
static void bxt_reduce_dma_latency(struct azx *chip)
{
        u32 val;

        val = azx_readl(chip, VS_EM4L);
        val &= (0x3 << 20);
        azx_writel(chip, VS_EM4L, val);
}

/*
 * ML_LCAP bits:
 *  bit 0: 6 MHz Supported
 *  bit 1: 12 MHz Supported
 *  bit 2: 24 MHz Supported
 *  bit 3: 48 MHz Supported
 *  bit 4: 96 MHz Supported
 *  bit 5: 192 MHz Supported
 */
static int intel_get_lctl_scf(struct azx *chip)
{
        struct hdac_bus *bus = azx_bus(chip);
        static int preferred_bits[] = { 2, 3, 1, 4, 5 };
        u32 val, t;
        int i;

        val = readl(bus->mlcap + AZX_ML_BASE + AZX_REG_ML_LCAP);

        for (i = 0; i < ARRAY_SIZE(preferred_bits); i++) {
                t = preferred_bits[i];
                if (val & (1 << t))
                        return t;
        }

        dev_warn(chip->card->dev, "set audio clock frequency to 6MHz");
        return 0;
}

static int intel_ml_lctl_set_power(struct azx *chip, int state)
{
        struct hdac_bus *bus = azx_bus(chip);
        u32 val;
        int timeout;

        /*
         * the codecs are sharing the first link setting by default
         * If other links are enabled for stream, they need similar fix
         */
        val = readl(bus->mlcap + AZX_ML_BASE + AZX_REG_ML_LCTL);
        val &= ~AZX_MLCTL_SPA;
        val |= state << AZX_MLCTL_SPA_SHIFT;
        writel(val, bus->mlcap + AZX_ML_BASE + AZX_REG_ML_LCTL);
        /* wait for CPA */
        timeout = 50;
        while (timeout) {
                if (((readl(bus->mlcap + AZX_ML_BASE + AZX_REG_ML_LCTL)) &
                    AZX_MLCTL_CPA) == (state << AZX_MLCTL_CPA_SHIFT))
                        return 0;
                timeout--;
                udelay(10);
        }

        return -1;
}

static void intel_init_lctl(struct azx *chip)
{
        struct hdac_bus *bus = azx_bus(chip);
        u32 val;
        int ret;

        /* 0. check lctl register value is correct or not */
        val = readl(bus->mlcap + AZX_ML_BASE + AZX_REG_ML_LCTL);
        /* if SCF is already set, let's use it */
        if ((val & ML_LCTL_SCF_MASK) != 0)
                return;

        /*
         * Before operating on SPA, CPA must match SPA.
         * Any deviation may result in undefined behavior.
         */
        if (((val & AZX_MLCTL_SPA) >> AZX_MLCTL_SPA_SHIFT) !=
                ((val & AZX_MLCTL_CPA) >> AZX_MLCTL_CPA_SHIFT))
                return;

        /* 1. turn link down: set SPA to 0 and wait CPA to 0 */
        ret = intel_ml_lctl_set_power(chip, 0);
        udelay(100);
        if (ret)
                goto set_spa;

        /* 2. update SCF to select a properly audio clock*/
        val &= ~ML_LCTL_SCF_MASK;
        val |= intel_get_lctl_scf(chip);
        writel(val, bus->mlcap + AZX_ML_BASE + AZX_REG_ML_LCTL);

set_spa:
        /* 4. turn link up: set SPA to 1 and wait CPA to 1 */
        intel_ml_lctl_set_power(chip, 1);
        udelay(100);
}

static void hda_intel_init_chip(struct azx *chip, bool full_reset)
{
        struct hdac_bus *bus = azx_bus(chip);
        struct pci_dev *pci = chip->pci;
        u32 val;

        if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
                snd_hdac_set_codec_wakeup(bus, true);
        if (chip->driver_type == AZX_DRIVER_SKL) {
                pci_read_config_dword(pci, INTEL_HDA_CGCTL, &val);
                val = val & ~INTEL_HDA_CGCTL_MISCBDCGE;
                pci_write_config_dword(pci, INTEL_HDA_CGCTL, val);
        }
        azx_init_chip(chip, full_reset);
        if (chip->driver_type == AZX_DRIVER_SKL) {
                pci_read_config_dword(pci, INTEL_HDA_CGCTL, &val);
                val = val | INTEL_HDA_CGCTL_MISCBDCGE;
                pci_write_config_dword(pci, INTEL_HDA_CGCTL, val);
        }
        if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
                snd_hdac_set_codec_wakeup(bus, false);

        /* reduce dma latency to avoid noise */
        if (IS_BXT(pci))
                bxt_reduce_dma_latency(chip);

        if (bus->mlcap != NULL)
                intel_init_lctl(chip);
}

/* calculate runtime delay from LPIB */
static int azx_get_delay_from_lpib(struct azx *chip, struct azx_dev *azx_dev,
                                   unsigned int pos)
{
        struct snd_pcm_substream *substream = azx_dev->core.substream;
        int stream = substream->stream;
        unsigned int lpib_pos = azx_get_pos_lpib(chip, azx_dev);
        int delay;

        if (stream == SNDRV_PCM_STREAM_PLAYBACK)
                delay = pos - lpib_pos;
        else
                delay = lpib_pos - pos;
        if (delay < 0) {
                if (delay >= azx_dev->core.delay_negative_threshold)
                        delay = 0;
                else
                        delay += azx_dev->core.bufsize;
        }

        if (delay >= azx_dev->core.period_bytes) {
                dev_info(chip->card->dev,
                         "Unstable LPIB (%d >= %d); disabling LPIB delay counting\n",
                         delay, azx_dev->core.period_bytes);
                delay = 0;
                chip->driver_caps &= ~AZX_DCAPS_COUNT_LPIB_DELAY;
                chip->get_delay[stream] = NULL;
        }

        return bytes_to_frames(substream->runtime, delay);
}

static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev);

/* called from IRQ */
static int azx_position_check(struct azx *chip, struct azx_dev *azx_dev)
{
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        int ok;

        ok = azx_position_ok(chip, azx_dev);
        if (ok == 1) {
                azx_dev->irq_pending = 0;
                return ok;
        } else if (ok == 0) {
                /* bogus IRQ, process it later */
                azx_dev->irq_pending = 1;
                schedule_work(&hda->irq_pending_work);
        }
        return 0;
}

/* Enable/disable i915 display power for the link */
static int azx_intel_link_power(struct azx *chip, bool enable)
{
        struct hdac_bus *bus = azx_bus(chip);

        return snd_hdac_display_power(bus, enable);
}

/*
 * Check whether the current DMA position is acceptable for updating
 * periods.  Returns non-zero if it's OK.
 *
 * Many HD-audio controllers appear pretty inaccurate about
 * the update-IRQ timing.  The IRQ is issued before actually the
 * data is processed.  So, we need to process it afterwords in a
 * workqueue.
 */
static int azx_position_ok(struct azx *chip, struct azx_dev *azx_dev)
{
        struct snd_pcm_substream *substream = azx_dev->core.substream;
        int stream = substream->stream;
        u32 wallclk;
        unsigned int pos;

        wallclk = azx_readl(chip, WALLCLK) - azx_dev->core.start_wallclk;
        if (wallclk < (azx_dev->core.period_wallclk * 2) / 3)
                return -1;      /* bogus (too early) interrupt */

        if (chip->get_position[stream])
                pos = chip->get_position[stream](chip, azx_dev);
        else { /* use the position buffer as default */
                pos = azx_get_pos_posbuf(chip, azx_dev);
                if (!pos || pos == (u32)-1) {
                        dev_info(chip->card->dev,
                                 "Invalid position buffer, using LPIB read method instead.\n");
                        chip->get_position[stream] = azx_get_pos_lpib;
                        if (chip->get_position[0] == azx_get_pos_lpib &&
                            chip->get_position[1] == azx_get_pos_lpib)
                                azx_bus(chip)->use_posbuf = false;
                        pos = azx_get_pos_lpib(chip, azx_dev);
                        chip->get_delay[stream] = NULL;
                } else {
                        chip->get_position[stream] = azx_get_pos_posbuf;
                        if (chip->driver_caps & AZX_DCAPS_COUNT_LPIB_DELAY)
                                chip->get_delay[stream] = azx_get_delay_from_lpib;
                }
        }

        if (pos >= azx_dev->core.bufsize)
                pos = 0;

        if (WARN_ONCE(!azx_dev->core.period_bytes,
                      "hda-intel: zero azx_dev->period_bytes"))
                return -1; /* this shouldn't happen! */
        if (wallclk < (azx_dev->core.period_wallclk * 5) / 4 &&
            pos % azx_dev->core.period_bytes > azx_dev->core.period_bytes / 2)
                /* NG - it's below the first next period boundary */
                return chip->bdl_pos_adj ? 0 : -1;
        azx_dev->core.start_wallclk += wallclk;
        return 1; /* OK, it's fine */
}

/*
 * The work for pending PCM period updates.
 */
static void azx_irq_pending_work(struct work_struct *work)
{
        struct hda_intel *hda = container_of(work, struct hda_intel, irq_pending_work);
        struct azx *chip = &hda->chip;
        struct hdac_bus *bus = azx_bus(chip);
        struct hdac_stream *s;
        int pending, ok;

        if (!hda->irq_pending_warned) {
                dev_info(chip->card->dev,
                         "IRQ timing workaround is activated for card #%d. Suggest a bigger bdl_pos_adj.\n",
                         chip->card->number);
                hda->irq_pending_warned = 1;
        }

        for (;;) {
                pending = 0;
                spin_lock_irq(&bus->reg_lock);
                list_for_each_entry(s, &bus->stream_list, list) {
                        struct azx_dev *azx_dev = stream_to_azx_dev(s);
                        if (!azx_dev->irq_pending ||
                            !s->substream ||
                            !s->running)
                                continue;
                        ok = azx_position_ok(chip, azx_dev);
                        if (ok > 0) {
                                azx_dev->irq_pending = 0;
                                spin_unlock(&bus->reg_lock);
                                snd_pcm_period_elapsed(s->substream);
                                spin_lock(&bus->reg_lock);
                        } else if (ok < 0) {
                                pending = 0;    /* too early */
                        } else
                                pending++;
                }
                spin_unlock_irq(&bus->reg_lock);
                if (!pending)
                        return;
                msleep(1);
        }
}

/* clear irq_pending flags and assure no on-going workq */
static void azx_clear_irq_pending(struct azx *chip)
{
        struct hdac_bus *bus = azx_bus(chip);
        struct hdac_stream *s;

        spin_lock_irq(&bus->reg_lock);
        list_for_each_entry(s, &bus->stream_list, list) {
                struct azx_dev *azx_dev = stream_to_azx_dev(s);
                azx_dev->irq_pending = 0;
        }
        spin_unlock_irq(&bus->reg_lock);
}

static int azx_acquire_irq(struct azx *chip, int do_disconnect)
{
        struct hdac_bus *bus = azx_bus(chip);

        if (request_irq(chip->pci->irq, azx_interrupt,
                        chip->msi ? 0 : IRQF_SHARED,
                        chip->card->irq_descr, chip)) {
                dev_err(chip->card->dev,
                        "unable to grab IRQ %d, disabling device\n",
                        chip->pci->irq);
                if (do_disconnect)
                        snd_card_disconnect(chip->card);
                return -1;
        }
        bus->irq = chip->pci->irq;
        pci_intx(chip->pci, !chip->msi);
        return 0;
}

/* get the current DMA position with correction on VIA chips */
static unsigned int azx_via_get_position(struct azx *chip,
                                         struct azx_dev *azx_dev)
{
        unsigned int link_pos, mini_pos, bound_pos;
        unsigned int mod_link_pos, mod_dma_pos, mod_mini_pos;
        unsigned int fifo_size;

        link_pos = snd_hdac_stream_get_pos_lpib(azx_stream(azx_dev));
        if (azx_dev->core.substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                /* Playback, no problem using link position */
                return link_pos;
        }

        /* Capture */
        /* For new chipset,
         * use mod to get the DMA position just like old chipset
         */
        mod_dma_pos = le32_to_cpu(*azx_dev->core.posbuf);
        mod_dma_pos %= azx_dev->core.period_bytes;

        /* azx_dev->fifo_size can't get FIFO size of in stream.
         * Get from base address + offset.
         */
        fifo_size = readw(azx_bus(chip)->remap_addr +
                          VIA_IN_STREAM0_FIFO_SIZE_OFFSET);

        if (azx_dev->insufficient) {
                /* Link position never gather than FIFO size */
                if (link_pos <= fifo_size)
                        return 0;

                azx_dev->insufficient = 0;
        }

        if (link_pos <= fifo_size)
                mini_pos = azx_dev->core.bufsize + link_pos - fifo_size;
        else
                mini_pos = link_pos - fifo_size;

        /* Find nearest previous boudary */
        mod_mini_pos = mini_pos % azx_dev->core.period_bytes;
        mod_link_pos = link_pos % azx_dev->core.period_bytes;
        if (mod_link_pos >= fifo_size)
                bound_pos = link_pos - mod_link_pos;
        else if (mod_dma_pos >= mod_mini_pos)
                bound_pos = mini_pos - mod_mini_pos;
        else {
                bound_pos = mini_pos - mod_mini_pos + azx_dev->core.period_bytes;
                if (bound_pos >= azx_dev->core.bufsize)
                        bound_pos = 0;
        }

        /* Calculate real DMA position we want */
        return bound_pos + mod_dma_pos;
}

static unsigned int azx_skl_get_dpib_pos(struct azx *chip,
                                         struct azx_dev *azx_dev)
{
        return _snd_hdac_chip_readl(azx_bus(chip),
                                    AZX_REG_VS_SDXDPIB_XBASE +
                                    (AZX_REG_VS_SDXDPIB_XINTERVAL *
                                     azx_dev->core.index));
}

/* get the current DMA position with correction on SKL+ chips */
static unsigned int azx_get_pos_skl(struct azx *chip, struct azx_dev *azx_dev)
{
        /* DPIB register gives a more accurate position for playback */
        if (azx_dev->core.substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                return azx_skl_get_dpib_pos(chip, azx_dev);

        /* For capture, we need to read posbuf, but it requires a delay
         * for the possible boundary overlap; the read of DPIB fetches the
         * actual posbuf
         */
        udelay(20);
        azx_skl_get_dpib_pos(chip, azx_dev);
        return azx_get_pos_posbuf(chip, azx_dev);
}

#ifdef CONFIG_PM
static DEFINE_MUTEX(card_list_lock);
static LIST_HEAD(card_list);

static void azx_add_card_list(struct azx *chip)
{
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        mutex_lock(&card_list_lock);
        list_add(&hda->list, &card_list);
        mutex_unlock(&card_list_lock);
}

static void azx_del_card_list(struct azx *chip)
{
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        mutex_lock(&card_list_lock);
        list_del_init(&hda->list);
        mutex_unlock(&card_list_lock);
}

/* trigger power-save check at writing parameter */
static int param_set_xint(const char *val, const struct kernel_param *kp)
{
        struct hda_intel *hda;
        struct azx *chip;
        int prev = power_save;
        int ret = param_set_int(val, kp);

        if (ret || prev == power_save)
                return ret;

        mutex_lock(&card_list_lock);
        list_for_each_entry(hda, &card_list, list) {
                chip = &hda->chip;
                if (!hda->probe_continued || chip->disabled)
                        continue;
                snd_hda_set_power_save(&chip->bus, power_save * 1000);
        }
        mutex_unlock(&card_list_lock);
        return 0;
}
#else
#define azx_add_card_list(chip) /* NOP */
#define azx_del_card_list(chip) /* NOP */
#endif /* CONFIG_PM */

#if defined(CONFIG_PM_SLEEP) || defined(SUPPORT_VGA_SWITCHEROO)
/*
 * power management
 */
static int azx_suspend(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct azx *chip;
        struct hda_intel *hda;
        struct hdac_bus *bus;

        if (!card)
                return 0;

        chip = card->private_data;
        hda = container_of(chip, struct hda_intel, chip);

        if (chip->disabled || hda->init_failed || !chip->running)
                return 0;

        bus = azx_bus(chip);
        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
        azx_clear_irq_pending(chip);
        azx_stop_chip(chip);
        azx_enter_link_reset(chip);
        if (bus->irq >= 0) {
                free_irq(bus->irq, chip);
                bus->irq = -1;
        }

        if (chip->msi)
                pci_disable_msi(chip->pci);
        if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
                && hda->need_i915_power)
                snd_hdac_display_power(bus, false);

        trace_azx_suspend(chip);
        return 0;
}

static int azx_resume(struct device *dev)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct snd_card *card = dev_get_drvdata(dev);
        struct azx *chip;
        struct hda_intel *hda;
        struct hdac_bus *bus;

        if (!card)
                return 0;

        chip = card->private_data;
        hda = container_of(chip, struct hda_intel, chip);
        bus = azx_bus(chip);
        if (chip->disabled || hda->init_failed || !chip->running)
                return 0;

        if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
                snd_hdac_display_power(bus, true);
                if (hda->need_i915_power)
                        snd_hdac_i915_set_bclk(bus);
        }

        if (chip->msi)
                if (pci_enable_msi(pci) < 0)
                        chip->msi = 0;
        if (azx_acquire_irq(chip, 1) < 0)
                return -EIO;
        azx_init_pci(chip);

        hda_intel_init_chip(chip, true);

        /* power down again for link-controlled chips */
        if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
            !hda->need_i915_power)
                snd_hdac_display_power(bus, false);

        snd_power_change_state(card, SNDRV_CTL_POWER_D0);

        trace_azx_resume(chip);
        return 0;
}
#endif /* CONFIG_PM_SLEEP || SUPPORT_VGA_SWITCHEROO */

#ifdef CONFIG_PM_SLEEP
/* put codec down to D3 at hibernation for Intel SKL+;
 * otherwise BIOS may still access the codec and screw up the driver
 */
static int azx_freeze_noirq(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct azx *chip = card->private_data;
        struct pci_dev *pci = to_pci_dev(dev);

        if (chip->driver_type == AZX_DRIVER_SKL)
                pci_set_power_state(pci, PCI_D3hot);

        return 0;
}

static int azx_thaw_noirq(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct azx *chip = card->private_data;
        struct pci_dev *pci = to_pci_dev(dev);

        if (chip->driver_type == AZX_DRIVER_SKL)
                pci_set_power_state(pci, PCI_D0);

        return 0;
}
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_PM
static int azx_runtime_suspend(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct azx *chip;
        struct hda_intel *hda;

        if (!card)
                return 0;

        chip = card->private_data;
        hda = container_of(chip, struct hda_intel, chip);
        if (chip->disabled || hda->init_failed)
                return 0;

        if (!azx_has_pm_runtime(chip))
                return 0;

        /* enable controller wake up event */
        azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
                  STATESTS_INT_MASK);

        azx_stop_chip(chip);
        azx_enter_link_reset(chip);
        azx_clear_irq_pending(chip);
        if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
                && hda->need_i915_power)
                snd_hdac_display_power(azx_bus(chip), false);

        trace_azx_runtime_suspend(chip);
        return 0;
}

static int azx_runtime_resume(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct azx *chip;
        struct hda_intel *hda;
        struct hdac_bus *bus;
        struct hda_codec *codec;
        int status;

        if (!card)
                return 0;

        chip = card->private_data;
        hda = container_of(chip, struct hda_intel, chip);
        bus = azx_bus(chip);
        if (chip->disabled || hda->init_failed)
                return 0;

        if (!azx_has_pm_runtime(chip))
                return 0;

        if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
                snd_hdac_display_power(bus, true);
                if (hda->need_i915_power)
                        snd_hdac_i915_set_bclk(bus);
        }

        /* Read STATESTS before controller reset */
        status = azx_readw(chip, STATESTS);

        azx_init_pci(chip);
        hda_intel_init_chip(chip, true);

        if (status) {
                list_for_each_codec(codec, &chip->bus)
                        if (status & (1 << codec->addr))
                                schedule_delayed_work(&codec->jackpoll_work,
                                                      codec->jackpoll_interval);
        }

        /* disable controller Wake Up event*/
        azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) &
                        ~STATESTS_INT_MASK);

        /* power down again for link-controlled chips */
        if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
            !hda->need_i915_power)
                snd_hdac_display_power(bus, false);

        trace_azx_runtime_resume(chip);
        return 0;
}

static int azx_runtime_idle(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct azx *chip;
        struct hda_intel *hda;

        if (!card)
                return 0;

        chip = card->private_data;
        hda = container_of(chip, struct hda_intel, chip);
        if (chip->disabled || hda->init_failed)
                return 0;

        if (!power_save_controller || !azx_has_pm_runtime(chip) ||
            azx_bus(chip)->codec_powered || !chip->running)
                return -EBUSY;

        return 0;
}

static const struct dev_pm_ops azx_pm = {
        SET_SYSTEM_SLEEP_PM_OPS(azx_suspend, azx_resume)
#ifdef CONFIG_PM_SLEEP
        .freeze_noirq = azx_freeze_noirq,
        .thaw_noirq = azx_thaw_noirq,
#endif
        SET_RUNTIME_PM_OPS(azx_runtime_suspend, azx_runtime_resume, azx_runtime_idle)
};

#define AZX_PM_OPS      &azx_pm
#else
#define AZX_PM_OPS      NULL
#endif /* CONFIG_PM */


static int azx_probe_continue(struct azx *chip);

#ifdef SUPPORT_VGA_SWITCHEROO
static struct pci_dev *get_bound_vga(struct pci_dev *pci);

static void azx_vs_set_state(struct pci_dev *pci,
                             enum vga_switcheroo_state state)
{
        struct snd_card *card = pci_get_drvdata(pci);
        struct azx *chip = card->private_data;
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        bool disabled;

        wait_for_completion(&hda->probe_wait);
        if (hda->init_failed)
                return;

        disabled = (state == VGA_SWITCHEROO_OFF);
        if (chip->disabled == disabled)
                return;

        if (!hda->probe_continued) {
                chip->disabled = disabled;
                if (!disabled) {
                        dev_info(chip->card->dev,
                                 "Start delayed initialization\n");
                        if (azx_probe_continue(chip) < 0) {
                                dev_err(chip->card->dev, "initialization error\n");
                                hda->init_failed = true;
                        }
                }
        } else {
                dev_info(chip->card->dev, "%s via vga_switcheroo\n",
                         disabled ? "Disabling" : "Enabling");
                if (disabled) {
                        pm_runtime_put_sync_suspend(card->dev);
                        azx_suspend(card->dev);
                        /* when we get suspended by vga_switcheroo we end up in D3cold,
                         * however we have no ACPI handle, so pci/acpi can't put us there,
                         * put ourselves there */
                        pci->current_state = PCI_D3cold;
                        chip->disabled = true;
                        if (snd_hda_lock_devices(&chip->bus))
                                dev_warn(chip->card->dev,
                                         "Cannot lock devices!\n");
                } else {
                        snd_hda_unlock_devices(&chip->bus);
                        pm_runtime_get_noresume(card->dev);
                        chip->disabled = false;
                        azx_resume(card->dev);
                }
        }
}

static bool azx_vs_can_switch(struct pci_dev *pci)
{
        struct snd_card *card = pci_get_drvdata(pci);
        struct azx *chip = card->private_data;
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);

        wait_for_completion(&hda->probe_wait);
        if (hda->init_failed)
                return false;
        if (chip->disabled || !hda->probe_continued)
                return true;
        if (snd_hda_lock_devices(&chip->bus))
                return false;
        snd_hda_unlock_devices(&chip->bus);
        return true;
}

static void init_vga_switcheroo(struct azx *chip)
{
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        struct pci_dev *p = get_bound_vga(chip->pci);
        if (p) {
                dev_info(chip->card->dev,
                         "Handle vga_switcheroo audio client\n");
                hda->use_vga_switcheroo = 1;
                pci_dev_put(p);
        }
}

static const struct vga_switcheroo_client_ops azx_vs_ops = {
        .set_gpu_state = azx_vs_set_state,
        .can_switch = azx_vs_can_switch,
};

static int register_vga_switcheroo(struct azx *chip)
{
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        int err;

        if (!hda->use_vga_switcheroo)
                return 0;
        /* FIXME: currently only handling DIS controller
         * is there any machine with two switchable HDMI audio controllers?
         */
        err = vga_switcheroo_register_audio_client(chip->pci, &azx_vs_ops,
                                                   VGA_SWITCHEROO_DIS);
        if (err < 0)
                return err;
        hda->vga_switcheroo_registered = 1;

        /* register as an optimus hdmi audio power domain */
        vga_switcheroo_init_domain_pm_optimus_hdmi_audio(chip->card->dev,
                                                         &hda->hdmi_pm_domain);
        return 0;
}
#else
#define init_vga_switcheroo(chip)               /* NOP */
#define register_vga_switcheroo(chip)           0
#define check_hdmi_disabled(pci)        false
#endif /* SUPPORT_VGA_SWITCHER */

/*
 * destructor
 */
static int azx_free(struct azx *chip)
{
        struct pci_dev *pci = chip->pci;
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        struct hdac_bus *bus = azx_bus(chip);

        if (azx_has_pm_runtime(chip) && chip->running)
                pm_runtime_get_noresume(&pci->dev);

        azx_del_card_list(chip);

        hda->init_failed = 1; /* to be sure */
        complete_all(&hda->probe_wait);

        if (use_vga_switcheroo(hda)) {
                if (chip->disabled && hda->probe_continued)
                        snd_hda_unlock_devices(&chip->bus);
                if (hda->vga_switcheroo_registered) {
                        vga_switcheroo_unregister_client(chip->pci);
                        vga_switcheroo_fini_domain_pm_ops(chip->card->dev);
                }
        }

        if (bus->chip_init) {
                azx_clear_irq_pending(chip);
                azx_stop_all_streams(chip);
                azx_stop_chip(chip);
        }

        if (bus->irq >= 0)
                free_irq(bus->irq, (void*)chip);
        if (chip->msi)
                pci_disable_msi(chip->pci);
        iounmap(bus->remap_addr);

        azx_free_stream_pages(chip);
        azx_free_streams(chip);
        snd_hdac_bus_exit(bus);

        if (chip->region_requested)
                pci_release_regions(chip->pci);

        pci_disable_device(chip->pci);
#ifdef CONFIG_SND_HDA_PATCH_LOADER
        release_firmware(chip->fw);
#endif

        if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
                if (hda->need_i915_power)
                        snd_hdac_display_power(bus, false);
        }
        if (chip->driver_caps & AZX_DCAPS_I915_COMPONENT)
                snd_hdac_i915_exit(bus);
        kfree(hda);

        return 0;
}

static int azx_dev_disconnect(struct snd_device *device)
{
        struct azx *chip = device->device_data;

        chip->bus.shutdown = 1;
        return 0;
}

static int azx_dev_free(struct snd_device *device)
{
        return azx_free(device->device_data);
}

#ifdef SUPPORT_VGA_SWITCHEROO
/*
 * Check of disabled HDMI controller by vga_switcheroo
 */
static struct pci_dev *get_bound_vga(struct pci_dev *pci)
{
        struct pci_dev *p;

        /* check only discrete GPU */
        switch (pci->vendor) {
        case PCI_VENDOR_ID_ATI:
        case PCI_VENDOR_ID_AMD:
        case PCI_VENDOR_ID_NVIDIA:
                if (pci->devfn == 1) {
                        p = pci_get_domain_bus_and_slot(pci_domain_nr(pci->bus),
                                                        pci->bus->number, 0);
                        if (p) {
                                if ((p->class >> 8) == PCI_CLASS_DISPLAY_VGA)
                                        return p;
                                pci_dev_put(p);
                        }
                }
                break;
        }
        return NULL;
}

static bool check_hdmi_disabled(struct pci_dev *pci)
{
        bool vga_inactive = false;
        struct pci_dev *p = get_bound_vga(pci);

        if (p) {
                if (vga_switcheroo_get_client_state(p) == VGA_SWITCHEROO_OFF)
                        vga_inactive = true;
                pci_dev_put(p);
        }
        return vga_inactive;
}
#endif /* SUPPORT_VGA_SWITCHEROO */

/*
 * white/black-listing for position_fix
 */
static struct snd_pci_quirk position_fix_list[] = {
        SND_PCI_QUIRK(0x1028, 0x01cc, "Dell D820", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1028, 0x01de, "Dell Precision 390", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x103c, 0x306d, "HP dv3", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1043, 0x813d, "ASUS P5AD2", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1043, 0x81b3, "ASUS", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1043, 0x81e7, "ASUS M2V", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x104d, 0x9069, "Sony VPCS11V9E", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x10de, 0xcb89, "Macbook Pro 7,1", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1297, 0x3166, "Shuttle", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1458, 0xa022, "ga-ma770-ud3", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1462, 0x1002, "MSI Wind U115", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1565, 0x8218, "Biostar Microtech", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x1849, 0x0888, "775Dual-VSTA", POS_FIX_LPIB),
        SND_PCI_QUIRK(0x8086, 0x2503, "DG965OT AAD63733-203", POS_FIX_LPIB),
        {}
};

static int check_position_fix(struct azx *chip, int fix)
{
        const struct snd_pci_quirk *q;

        switch (fix) {
        case POS_FIX_AUTO:
        case POS_FIX_LPIB:
        case POS_FIX_POSBUF:
        case POS_FIX_VIACOMBO:
        case POS_FIX_COMBO:
        case POS_FIX_SKL:
                return fix;
        }

        q = snd_pci_quirk_lookup(chip->pci, position_fix_list);
        if (q) {
                dev_info(chip->card->dev,
                         "position_fix set to %d for device %04x:%04x\n",
                         q->value, q->subvendor, q->subdevice);
                return q->value;
        }

        /* Check VIA/ATI HD Audio Controller exist */
        if (chip->driver_type == AZX_DRIVER_VIA) {
                dev_dbg(chip->card->dev, "Using VIACOMBO position fix\n");
                return POS_FIX_VIACOMBO;
        }
        if (chip->driver_caps & AZX_DCAPS_POSFIX_LPIB) {
                dev_dbg(chip->card->dev, "Using LPIB position fix\n");
                return POS_FIX_LPIB;
        }
        if (chip->driver_type == AZX_DRIVER_SKL) {
                dev_dbg(chip->card->dev, "Using SKL position fix\n");
                return POS_FIX_SKL;
        }
        return POS_FIX_AUTO;
}

static void assign_position_fix(struct azx *chip, int fix)
{
        static azx_get_pos_callback_t callbacks[] = {
                [POS_FIX_AUTO] = NULL,
                [POS_FIX_LPIB] = azx_get_pos_lpib,
                [POS_FIX_POSBUF] = azx_get_pos_posbuf,
                [POS_FIX_VIACOMBO] = azx_via_get_position,
                [POS_FIX_COMBO] = azx_get_pos_lpib,
                [POS_FIX_SKL] = azx_get_pos_skl,
        };

        chip->get_position[0] = chip->get_position[1] = callbacks[fix];

        /* combo mode uses LPIB only for playback */
        if (fix == POS_FIX_COMBO)
                chip->get_position[1] = NULL;

        if ((fix == POS_FIX_POSBUF || fix == POS_FIX_SKL) &&
            (chip->driver_caps & AZX_DCAPS_COUNT_LPIB_DELAY)) {
                chip->get_delay[0] = chip->get_delay[1] =
                        azx_get_delay_from_lpib;
        }

}

/*
 * black-lists for probe_mask
 */
static struct snd_pci_quirk probe_mask_list[] = {
        /* Thinkpad often breaks the controller communication when accessing
         * to the non-working (or non-existing) modem codec slot.
         */
        SND_PCI_QUIRK(0x1014, 0x05b7, "Thinkpad Z60", 0x01),
        SND_PCI_QUIRK(0x17aa, 0x2010, "Thinkpad X/T/R60", 0x01),
        SND_PCI_QUIRK(0x17aa, 0x20ac, "Thinkpad X/T/R61", 0x01),
        /* broken BIOS */
        SND_PCI_QUIRK(0x1028, 0x20ac, "Dell Studio Desktop", 0x01),
        /* including bogus ALC268 in slot#2 that conflicts with ALC888 */
        SND_PCI_QUIRK(0x17c0, 0x4085, "Medion MD96630", 0x01),
        /* forced codec slots */
        SND_PCI_QUIRK(0x1043, 0x1262, "ASUS W5Fm", 0x103),
        SND_PCI_QUIRK(0x1046, 0x1262, "ASUS W5F", 0x103),
        /* WinFast VP200 H (Teradici) user reported broken communication */
        SND_PCI_QUIRK(0x3a21, 0x040d, "WinFast VP200 H", 0x101),
        {}
};

#define AZX_FORCE_CODEC_MASK    0x100

static void check_probe_mask(struct azx *chip, int dev)
{
        const struct snd_pci_quirk *q;

        chip->codec_probe_mask = probe_mask[dev];
        if (chip->codec_probe_mask == -1) {
                q = snd_pci_quirk_lookup(chip->pci, probe_mask_list);
                if (q) {
                        dev_info(chip->card->dev,
                                 "probe_mask set to 0x%x for device %04x:%04x\n",
                                 q->value, q->subvendor, q->subdevice);
                        chip->codec_probe_mask = q->value;
                }
        }

        /* check forced option */
        if (chip->codec_probe_mask != -1 &&
            (chip->codec_probe_mask & AZX_FORCE_CODEC_MASK)) {
                azx_bus(chip)->codec_mask = chip->codec_probe_mask & 0xff;
                dev_info(chip->card->dev, "codec_mask forced to 0x%x\n",
                         (int)azx_bus(chip)->codec_mask);
        }
}

/*
 * white/black-list for enable_msi
 */
static struct snd_pci_quirk msi_black_list[] = {
        SND_PCI_QUIRK(0x103c, 0x2191, "HP", 0), /* AMD Hudson */
        SND_PCI_QUIRK(0x103c, 0x2192, "HP", 0), /* AMD Hudson */
        SND_PCI_QUIRK(0x103c, 0x21f7, "HP", 0), /* AMD Hudson */
        SND_PCI_QUIRK(0x103c, 0x21fa, "HP", 0), /* AMD Hudson */
        SND_PCI_QUIRK(0x1043, 0x81f2, "ASUS", 0), /* Athlon64 X2 + nvidia */
        SND_PCI_QUIRK(0x1043, 0x81f6, "ASUS", 0), /* nvidia */
        SND_PCI_QUIRK(0x1043, 0x822d, "ASUS", 0), /* Athlon64 X2 + nvidia MCP55 */
        SND_PCI_QUIRK(0x1179, 0xfb44, "Toshiba Satellite C870", 0), /* AMD Hudson */
        SND_PCI_QUIRK(0x1849, 0x0888, "ASRock", 0), /* Athlon64 X2 + nvidia */
        SND_PCI_QUIRK(0xa0a0, 0x0575, "Aopen MZ915-M", 0), /* ICH6 */
        {}
};

static void check_msi(struct azx *chip)
{
        const struct snd_pci_quirk *q;

        if (enable_msi >= 0) {
                chip->msi = !!enable_msi;
                return;
        }
        chip->msi = 1;  /* enable MSI as default */
        q = snd_pci_quirk_lookup(chip->pci, msi_black_list);
        if (q) {
                dev_info(chip->card->dev,
                         "msi for device %04x:%04x set to %d\n",
                         q->subvendor, q->subdevice, q->value);
                chip->msi = q->value;
                return;
        }

        /* NVidia chipsets seem to cause troubles with MSI */
        if (chip->driver_caps & AZX_DCAPS_NO_MSI) {
                dev_info(chip->card->dev, "Disabling MSI\n");
                chip->msi = 0;
        }
}

/* check the snoop mode availability */
static void azx_check_snoop_available(struct azx *chip)
{
        int snoop = hda_snoop;

        if (snoop >= 0) {
                dev_info(chip->card->dev, "Force to %s mode by module option\n",
                         snoop ? "snoop" : "non-snoop");
                chip->snoop = snoop;
                return;
        }

        snoop = true;
        if (azx_get_snoop_type(chip) == AZX_SNOOP_TYPE_NONE &&
            chip->driver_type == AZX_DRIVER_VIA) {
                /* force to non-snoop mode for a new VIA controller
                 * when BIOS is set
                 */
                u8 val;
                pci_read_config_byte(chip->pci, 0x42, &val);
                if (!(val & 0x80) && chip->pci->revision == 0x30)
                        snoop = false;
        }

        if (chip->driver_caps & AZX_DCAPS_SNOOP_OFF)
                snoop = false;

        chip->snoop = snoop;
        if (!snoop)
                dev_info(chip->card->dev, "Force to non-snoop mode\n");
}

static void azx_probe_work(struct work_struct *work)
{
        struct hda_intel *hda = container_of(work, struct hda_intel, probe_work);
        azx_probe_continue(&hda->chip);
}

static int default_bdl_pos_adj(struct azx *chip)
{
        /* some exceptions: Atoms seem problematic with value 1 */
        if (chip->pci->vendor == PCI_VENDOR_ID_INTEL) {
                switch (chip->pci->device) {
                case 0x0f04: /* Baytrail */
                case 0x2284: /* Braswell */
                        return 32;
                }
        }

        switch (chip->driver_type) {
        case AZX_DRIVER_ICH:
        case AZX_DRIVER_PCH:
                return 1;
        default:
                return 32;
        }
}

/*
 * constructor
 */
static const struct hdac_io_ops pci_hda_io_ops;
static const struct hda_controller_ops pci_hda_ops;

static int azx_create(struct snd_card *card, struct pci_dev *pci,
                      int dev, unsigned int driver_caps,
                      struct azx **rchip)
{
        static struct snd_device_ops ops = {
                .dev_disconnect = azx_dev_disconnect,
                .dev_free = azx_dev_free,
        };
        struct hda_intel *hda;
        struct azx *chip;
        int err;

        *rchip = NULL;

        err = pci_enable_device(pci);
        if (err < 0)
                return err;

        hda = kzalloc(sizeof(*hda), GFP_KERNEL);
        if (!hda) {
                pci_disable_device(pci);
                return -ENOMEM;
        }

        chip = &hda->chip;
        mutex_init(&chip->open_mutex);
        chip->card = card;
        chip->pci = pci;
        chip->ops = &pci_hda_ops;
        chip->driver_caps = driver_caps;
        chip->driver_type = driver_caps & 0xff;
        check_msi(chip);
        chip->dev_index = dev;
        chip->jackpoll_ms = jackpoll_ms;
        INIT_LIST_HEAD(&chip->pcm_list);
        INIT_WORK(&hda->irq_pending_work, azx_irq_pending_work);
        INIT_LIST_HEAD(&hda->list);
        init_vga_switcheroo(chip);
        init_completion(&hda->probe_wait);

        assign_position_fix(chip, check_position_fix(chip, position_fix[dev]));

        check_probe_mask(chip, dev);

        if (single_cmd < 0) /* allow fallback to single_cmd at errors */
                chip->fallback_to_single_cmd = 1;
        else /* explicitly set to single_cmd or not */
                chip->single_cmd = single_cmd;

        azx_check_snoop_available(chip);

        if (bdl_pos_adj[dev] < 0)
                chip->bdl_pos_adj = default_bdl_pos_adj(chip);
        else
                chip->bdl_pos_adj = bdl_pos_adj[dev];

        err = azx_bus_init(chip, model[dev], &pci_hda_io_ops);
        if (err < 0) {
                kfree(hda);
                pci_disable_device(pci);
                return err;
        }

        if (chip->driver_type == AZX_DRIVER_NVIDIA) {
                dev_dbg(chip->card->dev, "Enable delay in RIRB handling\n");
                chip->bus.needs_damn_long_delay = 1;
        }

        err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
        if (err < 0) {
                dev_err(card->dev, "Error creating device [card]!\n");
                azx_free(chip);
                return err;
        }

        /* continue probing in work context as may trigger request module */
        INIT_WORK(&hda->probe_work, azx_probe_work);

        *rchip = chip;

        return 0;
}

static int azx_first_init(struct azx *chip)
{
        int dev = chip->dev_index;
        struct pci_dev *pci = chip->pci;
        struct snd_card *card = chip->card;
        struct hdac_bus *bus = azx_bus(chip);
        int err;
        unsigned short gcap;
        unsigned int dma_bits = 64;

#if BITS_PER_LONG != 64
        /* Fix up base address on ULI M5461 */
        if (chip->driver_type == AZX_DRIVER_ULI) {
                u16 tmp3;
                pci_read_config_word(pci, 0x40, &tmp3);
                pci_write_config_word(pci, 0x40, tmp3 | 0x10);
                pci_write_config_dword(pci, PCI_BASE_ADDRESS_1, 0);
        }
#endif

        err = pci_request_regions(pci, "ICH HD audio");
        if (err < 0)
                return err;
        chip->region_requested = 1;

        bus->addr = pci_resource_start(pci, 0);
        bus->remap_addr = pci_ioremap_bar(pci, 0);
        if (bus->remap_addr == NULL) {
                dev_err(card->dev, "ioremap error\n");
                return -ENXIO;
        }

        if (chip->driver_type == AZX_DRIVER_SKL)
                snd_hdac_bus_parse_capabilities(bus);

        /*
         * Some Intel CPUs has always running timer (ART) feature and
         * controller may have Global time sync reporting capability, so
         * check both of these before declaring synchronized time reporting
         * capability SNDRV_PCM_INFO_HAS_LINK_SYNCHRONIZED_ATIME
         */
        chip->gts_present = false;

#ifdef CONFIG_X86
        if (bus->ppcap && boot_cpu_has(X86_FEATURE_ART))
                chip->gts_present = true;
#endif

        if (chip->msi) {
                if (chip->driver_caps & AZX_DCAPS_NO_MSI64) {
                        dev_dbg(card->dev, "Disabling 64bit MSI\n");
                        pci->no_64bit_msi = true;
                }
                if (pci_enable_msi(pci) < 0)
                        chip->msi = 0;
        }

        if (azx_acquire_irq(chip, 0) < 0)
                return -EBUSY;

        pci_set_master(pci);
        synchronize_irq(bus->irq);

        gcap = azx_readw(chip, GCAP);
        dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);

        /* AMD devices support 40 or 48bit DMA, take the safe one */
        if (chip->pci->vendor == PCI_VENDOR_ID_AMD)
                dma_bits = 40;

        /* disable SB600 64bit support for safety */
        if (chip->pci->vendor == PCI_VENDOR_ID_ATI) {
                struct pci_dev *p_smbus;
                dma_bits = 40;
                p_smbus = pci_get_device(PCI_VENDOR_ID_ATI,
                                         PCI_DEVICE_ID_ATI_SBX00_SMBUS,
                                         NULL);
                if (p_smbus) {
                        if (p_smbus->revision < 0x30)
                                gcap &= ~AZX_GCAP_64OK;
                        pci_dev_put(p_smbus);
                }
        }

        /* NVidia hardware normally only supports up to 40 bits of DMA */
        if (chip->pci->vendor == PCI_VENDOR_ID_NVIDIA)
                dma_bits = 40;

        /* disable 64bit DMA address on some devices */
        if (chip->driver_caps & AZX_DCAPS_NO_64BIT) {
                dev_dbg(card->dev, "Disabling 64bit DMA\n");
                gcap &= ~AZX_GCAP_64OK;
        }

        /* disable buffer size rounding to 128-byte multiples if supported */
        if (align_buffer_size >= 0)
                chip->align_buffer_size = !!align_buffer_size;
        else {
                if (chip->driver_caps & AZX_DCAPS_NO_ALIGN_BUFSIZE)
                        chip->align_buffer_size = 0;
                else
                        chip->align_buffer_size = 1;
        }

        /* allow 64bit DMA address if supported by H/W */
        if (!(gcap & AZX_GCAP_64OK))
                dma_bits = 32;
        if (!dma_set_mask(&pci->dev, DMA_BIT_MASK(dma_bits))) {
                dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(dma_bits));
        } else {
                dma_set_mask(&pci->dev, DMA_BIT_MASK(32));
                dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(32));
        }

        /* read number of streams from GCAP register instead of using
         * hardcoded value
         */
        chip->capture_streams = (gcap >> 8) & 0x0f;
        chip->playback_streams = (gcap >> 12) & 0x0f;
        if (!chip->playback_streams && !chip->capture_streams) {
                /* gcap didn't give any info, switching to old method */

                switch (chip->driver_type) {
                case AZX_DRIVER_ULI:
                        chip->playback_streams = ULI_NUM_PLAYBACK;
                        chip->capture_streams = ULI_NUM_CAPTURE;
                        break;
                case AZX_DRIVER_ATIHDMI:
                case AZX_DRIVER_ATIHDMI_NS:
                        chip->playback_streams = ATIHDMI_NUM_PLAYBACK;
                        chip->capture_streams = ATIHDMI_NUM_CAPTURE;
                        break;
                case AZX_DRIVER_GENERIC:
                default:
                        chip->playback_streams = ICH6_NUM_PLAYBACK;
                        chip->capture_streams = ICH6_NUM_CAPTURE;
                        break;
                }
        }
        chip->capture_index_offset = 0;
        chip->playback_index_offset = chip->capture_streams;
        chip->num_streams = chip->playback_streams + chip->capture_streams;

        /* sanity check for the SDxCTL.STRM field overflow */
        if (chip->num_streams > 15 &&
            (chip->driver_caps & AZX_DCAPS_SEPARATE_STREAM_TAG) == 0) {
                dev_warn(chip->card->dev, "number of I/O streams is %d, "
                         "forcing separate stream tags", chip->num_streams);
                chip->driver_caps |= AZX_DCAPS_SEPARATE_STREAM_TAG;
        }

        /* initialize streams */
        err = azx_init_streams(chip);
        if (err < 0)
                return err;

        err = azx_alloc_stream_pages(chip);
        if (err < 0)
                return err;

        /* initialize chip */
        azx_init_pci(chip);

        if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
                snd_hdac_i915_set_bclk(bus);

        hda_intel_init_chip(chip, (probe_only[dev] & 2) == 0);

        /* codec detection */
        if (!azx_bus(chip)->codec_mask) {
                dev_err(card->dev, "no codecs found!\n");
                return -ENODEV;
        }

        strcpy(card->driver, "HDA-Intel");
        strlcpy(card->shortname, driver_short_names[chip->driver_type],
                sizeof(card->shortname));
        snprintf(card->longname, sizeof(card->longname),
                 "%s at 0x%lx irq %i",
                 card->shortname, bus->addr, bus->irq);

        return 0;
}

#ifdef CONFIG_SND_HDA_PATCH_LOADER
/* callback from request_firmware_nowait() */
static void azx_firmware_cb(const struct firmware *fw, void *context)
{
        struct snd_card *card = context;
        struct azx *chip = card->private_data;
        struct pci_dev *pci = chip->pci;

        if (!fw) {
                dev_err(card->dev, "Cannot load firmware, aborting\n");
                goto error;
        }

        chip->fw = fw;
        if (!chip->disabled) {
                /* continue probing */
                if (azx_probe_continue(chip))
                        goto error;
        }
        return; /* OK */

 error:
        snd_card_free(card);
        pci_set_drvdata(pci, NULL);
}
#endif

/*
 * HDA controller ops.
 */

/* PCI register access. */
static void pci_azx_writel(u32 value, u32 __iomem *addr)
{
        writel(value, addr);
}

static u32 pci_azx_readl(u32 __iomem *addr)
{
        return readl(addr);
}

static void pci_azx_writew(u16 value, u16 __iomem *addr)
{
        writew(value, addr);
}

static u16 pci_azx_readw(u16 __iomem *addr)
{
        return readw(addr);
}

static void pci_azx_writeb(u8 value, u8 __iomem *addr)
{
        writeb(value, addr);
}

static u8 pci_azx_readb(u8 __iomem *addr)
{
        return readb(addr);
}

static int disable_msi_reset_irq(struct azx *chip)
{
        struct hdac_bus *bus = azx_bus(chip);
        int err;

        free_irq(bus->irq, chip);
        bus->irq = -1;
        pci_disable_msi(chip->pci);
        chip->msi = 0;
        err = azx_acquire_irq(chip, 1);
        if (err < 0)
                return err;

        return 0;
}

/* DMA page allocation helpers.  */
static int dma_alloc_pages(struct hdac_bus *bus,
                           int type,
                           size_t size,
                           struct snd_dma_buffer *buf)
{
        struct azx *chip = bus_to_azx(bus);
        int err;

        err = snd_dma_alloc_pages(type,
                                  bus->dev,
                                  size, buf);
        if (err < 0)
                return err;
        mark_pages_wc(chip, buf, true);
        return 0;
}

static void dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
{
        struct azx *chip = bus_to_azx(bus);

        mark_pages_wc(chip, buf, false);
        snd_dma_free_pages(buf);
}

static int substream_alloc_pages(struct azx *chip,
                                 struct snd_pcm_substream *substream,
                                 size_t size)
{
        struct azx_dev *azx_dev = get_azx_dev(substream);
        int ret;

        mark_runtime_wc(chip, azx_dev, substream, false);
        ret = snd_pcm_lib_malloc_pages(substream, size);
        if (ret < 0)
                return ret;
        mark_runtime_wc(chip, azx_dev, substream, true);
        return 0;
}

static int substream_free_pages(struct azx *chip,
                                struct snd_pcm_substream *substream)
{
        struct azx_dev *azx_dev = get_azx_dev(substream);
        mark_runtime_wc(chip, azx_dev, substream, false);
        return snd_pcm_lib_free_pages(substream);
}

static void pcm_mmap_prepare(struct snd_pcm_substream *substream,
                             struct vm_area_struct *area)
{
#ifdef CONFIG_X86
        struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
        struct azx *chip = apcm->chip;
        if (!azx_snoop(chip) && chip->driver_type != AZX_DRIVER_CMEDIA)
                area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
#endif
}

static const struct hdac_io_ops pci_hda_io_ops = {
        .reg_writel = pci_azx_writel,
        .reg_readl = pci_azx_readl,
        .reg_writew = pci_azx_writew,
        .reg_readw = pci_azx_readw,
        .reg_writeb = pci_azx_writeb,
        .reg_readb = pci_azx_readb,
        .dma_alloc_pages = dma_alloc_pages,
        .dma_free_pages = dma_free_pages,
};

static const struct hda_controller_ops pci_hda_ops = {
        .disable_msi_reset_irq = disable_msi_reset_irq,
        .substream_alloc_pages = substream_alloc_pages,
        .substream_free_pages = substream_free_pages,
        .pcm_mmap_prepare = pcm_mmap_prepare,
        .position_check = azx_position_check,
        .link_power = azx_intel_link_power,
};

static int azx_probe(struct pci_dev *pci,
                     const struct pci_device_id *pci_id)
{
        static int dev;
        struct snd_card *card;
        struct hda_intel *hda;
        struct azx *chip;
        bool schedule_probe;
        int err;

        if (dev >= SNDRV_CARDS)
                return -ENODEV;
        if (!enable[dev]) {
                dev++;
                return -ENOENT;
        }

        err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
                           0, &card);
        if (err < 0) {
                dev_err(&pci->dev, "Error creating card!\n");
                return err;
        }

        err = azx_create(card, pci, dev, pci_id->driver_data, &chip);
        if (err < 0)
                goto out_free;
        card->private_data = chip;
        hda = container_of(chip, struct hda_intel, chip);

        pci_set_drvdata(pci, card);

        err = register_vga_switcheroo(chip);
        if (err < 0) {
                dev_err(card->dev, "Error registering vga_switcheroo client\n");
                goto out_free;
        }

        if (check_hdmi_disabled(pci)) {
                dev_info(card->dev, "VGA controller is disabled\n");
                dev_info(card->dev, "Delaying initialization\n");
                chip->disabled = true;
        }

        schedule_probe = !chip->disabled;

#ifdef CONFIG_SND_HDA_PATCH_LOADER
        if (patch[dev] && *patch[dev]) {
                dev_info(card->dev, "Applying patch firmware '%s'\n",
                         patch[dev]);
                err = request_firmware_nowait(THIS_MODULE, true, patch[dev],
                                              &pci->dev, GFP_KERNEL, card,
                                              azx_firmware_cb);
                if (err < 0)
                        goto out_free;
                schedule_probe = false; /* continued in azx_firmware_cb() */
        }
#endif /* CONFIG_SND_HDA_PATCH_LOADER */

#ifndef CONFIG_SND_HDA_I915
        if (CONTROLLER_IN_GPU(pci))
                dev_err(card->dev, "Haswell/Broadwell HDMI/DP must build in CONFIG_SND_HDA_I915\n");
#endif

        if (schedule_probe)
                schedule_work(&hda->probe_work);

        dev++;
        if (chip->disabled)
                complete_all(&hda->probe_wait);
        return 0;

out_free:
        snd_card_free(card);
        return err;
}

/* number of codec slots for each chipset: 0 = default slots (i.e. 4) */
static unsigned int azx_max_codecs[AZX_NUM_DRIVERS] = {
        [AZX_DRIVER_NVIDIA] = 8,
        [AZX_DRIVER_TERA] = 1,
};

static int azx_probe_continue(struct azx *chip)
{
        struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
        struct hdac_bus *bus = azx_bus(chip);
        struct pci_dev *pci = chip->pci;
        int dev = chip->dev_index;
        int err;

        hda->probe_continued = 1;

        /* bind with i915 if needed */
        if (chip->driver_caps & AZX_DCAPS_I915_COMPONENT) {
                err = snd_hdac_i915_init(bus);
                if (err < 0) {
                        /* if the controller is bound only with HDMI/DP
                         * (for HSW and BDW), we need to abort the probe;
                         * for other chips, still continue probing as other
                         * codecs can be on the same link.
                         */
                        if (CONTROLLER_IN_GPU(pci)) {
                                dev_err(chip->card->dev,
                                        "HSW/BDW HD-audio HDMI/DP requires binding with gfx driver\n");
                                goto out_free;
                        } else {
                                /* don't bother any longer */
                                chip->driver_caps &=
                                        ~(AZX_DCAPS_I915_COMPONENT | AZX_DCAPS_I915_POWERWELL);
                        }
                }
        }

        /* Request display power well for the HDA controller or codec. For
         * Haswell/Broadwell, both the display HDA controller and codec need
         * this power. For other platforms, like Baytrail/Braswell, only the
         * display codec needs the power and it can be released after probe.
         */
        if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
                /* HSW/BDW controllers need this power */
                if (CONTROLLER_IN_GPU(pci))
                        hda->need_i915_power = 1;

                err = snd_hdac_display_power(bus, true);
                if (err < 0) {
                        dev_err(chip->card->dev,
                                "Cannot turn on display power on i915\n");
                        goto i915_power_fail;
                }
        }

        err = azx_first_init(chip);
        if (err < 0)
                goto out_free;

#ifdef CONFIG_SND_HDA_INPUT_BEEP
        chip->beep_mode = beep_mode[dev];
#endif

        /* create codec instances */
        err = azx_probe_codecs(chip, azx_max_codecs[chip->driver_type]);
        if (err < 0)
                goto out_free;

#ifdef CONFIG_SND_HDA_PATCH_LOADER
        if (chip->fw) {
                err = snd_hda_load_patch(&chip->bus, chip->fw->size,
                                         chip->fw->data);
                if (err < 0)
                        goto out_free;
#ifndef CONFIG_PM
                release_firmware(chip->fw); /* no longer needed */
                chip->fw = NULL;
#endif
        }
#endif
        if ((probe_only[dev] & 1) == 0) {
                err = azx_codec_configure(chip);
                if (err < 0)
                        goto out_free;
        }

        err = snd_card_register(chip->card);
        if (err < 0)
                goto out_free;

        chip->running = 1;
        azx_add_card_list(chip);
        snd_hda_set_power_save(&chip->bus, power_save * 1000);
        if (azx_has_pm_runtime(chip) || hda->use_vga_switcheroo)
                pm_runtime_put_autosuspend(&pci->dev);

out_free:
        if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
                && !hda->need_i915_power)
                snd_hdac_display_power(bus, false);

i915_power_fail:
        if (err < 0)
                hda->init_failed = 1;
        complete_all(&hda->probe_wait);
        return err;
}

static void azx_remove(struct pci_dev *pci)
{
        struct snd_card *card = pci_get_drvdata(pci);
        struct azx *chip;
        struct hda_intel *hda;

        if (card) {
                /* cancel the pending probing work */
                chip = card->private_data;
                hda = container_of(chip, struct hda_intel, chip);
                /* FIXME: below is an ugly workaround.
                 * Both device_release_driver() and driver_probe_device()
                 * take *both* the device's and its parent's lock before
                 * calling the remove() and probe() callbacks.  The codec
                 * probe takes the locks of both the codec itself and its
                 * parent, i.e. the PCI controller dev.  Meanwhile, when
                 * the PCI controller is unbound, it takes its lock, too
                 * ==> ouch, a deadlock!
                 * As a workaround, we unlock temporarily here the controller
                 * device during cancel_work_sync() call.
                 */
                device_unlock(&pci->dev);
                cancel_work_sync(&hda->probe_work);
                device_lock(&pci->dev);

                snd_card_free(card);
        }
}

static void azx_shutdown(struct pci_dev *pci)
{
        struct snd_card *card = pci_get_drvdata(pci);
        struct azx *chip;

        if (!card)
                return;
        chip = card->private_data;
        if (chip && chip->running)
                azx_stop_chip(chip);
}

/* PCI IDs */
static const struct pci_device_id azx_ids[] = {
        /* CPT */
        { PCI_DEVICE(0x8086, 0x1c20),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH_NOPM },
        /* PBG */
        { PCI_DEVICE(0x8086, 0x1d20),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH_NOPM },
        /* Panther Point */
        { PCI_DEVICE(0x8086, 0x1e20),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH_NOPM },
        /* Lynx Point */
        { PCI_DEVICE(0x8086, 0x8c20),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
        /* 9 Series */
        { PCI_DEVICE(0x8086, 0x8ca0),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
        /* Wellsburg */
        { PCI_DEVICE(0x8086, 0x8d20),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
        { PCI_DEVICE(0x8086, 0x8d21),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
        /* Lewisburg */
        { PCI_DEVICE(0x8086, 0xa1f0),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_SKYLAKE },
        { PCI_DEVICE(0x8086, 0xa270),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_SKYLAKE },
        /* Lynx Point-LP */
        { PCI_DEVICE(0x8086, 0x9c20),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
        /* Lynx Point-LP */
        { PCI_DEVICE(0x8086, 0x9c21),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
        /* Wildcat Point-LP */
        { PCI_DEVICE(0x8086, 0x9ca0),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_PCH },
        /* Sunrise Point */
        { PCI_DEVICE(0x8086, 0xa170),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
        /* Sunrise Point-LP */
        { PCI_DEVICE(0x8086, 0x9d70),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
        /* Kabylake */
        { PCI_DEVICE(0x8086, 0xa171),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
        /* Kabylake-LP */
        { PCI_DEVICE(0x8086, 0x9d71),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
        /* Kabylake-H */
        { PCI_DEVICE(0x8086, 0xa2f0),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE },
        /* Coffelake */
        { PCI_DEVICE(0x8086, 0xa348),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
        /* Cannonlake */
        { PCI_DEVICE(0x8086, 0x9dc8),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
        /* Broxton-P(Apollolake) */
        { PCI_DEVICE(0x8086, 0x5a98),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON },
        /* Broxton-T */
        { PCI_DEVICE(0x8086, 0x1a98),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON },
        /* Gemini-Lake */
        { PCI_DEVICE(0x8086, 0x3198),
          .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_BROXTON },
        /* Haswell */
        { PCI_DEVICE(0x8086, 0x0a0c),
          .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
        { PCI_DEVICE(0x8086, 0x0c0c),
          .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
        { PCI_DEVICE(0x8086, 0x0d0c),
          .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_HASWELL },
        /* Broadwell */
        { PCI_DEVICE(0x8086, 0x160c),
          .driver_data = AZX_DRIVER_HDMI | AZX_DCAPS_INTEL_BROADWELL },
        /* 5 Series/3400 */
        { PCI_DEVICE(0x8086, 0x3b56),
          .driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_NOPM },
        /* Poulsbo */
        { PCI_DEVICE(0x8086, 0x811b),
          .driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_BASE },
        /* Oaktrail */
        { PCI_DEVICE(0x8086, 0x080a),
          .driver_data = AZX_DRIVER_SCH | AZX_DCAPS_INTEL_PCH_BASE },
        /* BayTrail */
        { PCI_DEVICE(0x8086, 0x0f04),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_BAYTRAIL },
        /* Braswell */
        { PCI_DEVICE(0x8086, 0x2284),
          .driver_data = AZX_DRIVER_PCH | AZX_DCAPS_INTEL_BRASWELL },
        /* ICH6 */
        { PCI_DEVICE(0x8086, 0x2668),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* ICH7 */
        { PCI_DEVICE(0x8086, 0x27d8),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* ESB2 */
        { PCI_DEVICE(0x8086, 0x269a),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* ICH8 */
        { PCI_DEVICE(0x8086, 0x284b),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* ICH9 */
        { PCI_DEVICE(0x8086, 0x293e),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* ICH9 */
        { PCI_DEVICE(0x8086, 0x293f),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* ICH10 */
        { PCI_DEVICE(0x8086, 0x3a3e),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* ICH10 */
        { PCI_DEVICE(0x8086, 0x3a6e),
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_INTEL_ICH },
        /* Generic Intel */
        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
          .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
          .class_mask = 0xffffff,
          .driver_data = AZX_DRIVER_ICH | AZX_DCAPS_NO_ALIGN_BUFSIZE },
        /* ATI SB 450/600/700/800/900 */
        { PCI_DEVICE(0x1002, 0x437b),
          .driver_data = AZX_DRIVER_ATI | AZX_DCAPS_PRESET_ATI_SB },
        { PCI_DEVICE(0x1002, 0x4383),
          .driver_data = AZX_DRIVER_ATI | AZX_DCAPS_PRESET_ATI_SB },
        /* AMD Hudson */
        { PCI_DEVICE(0x1022, 0x780d),
          .driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_SB },
        /* ATI HDMI */
        { PCI_DEVICE(0x1002, 0x0002),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0x1308),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0x157a),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0x15b3),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0x793b),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0x7919),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0x960f),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0x970f),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0x9840),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaa00),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa08),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa10),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa18),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa20),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa28),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa30),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa38),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa40),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa48),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa50),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa58),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa60),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa68),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa80),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa88),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa90),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0xaa98),
          .driver_data = AZX_DRIVER_ATIHDMI | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(0x1002, 0x9902),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaaa0),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaaa8),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaab0),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaac0),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaac8),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaad8),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaae8),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaae0),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        { PCI_DEVICE(0x1002, 0xaaf0),
          .driver_data = AZX_DRIVER_ATIHDMI_NS | AZX_DCAPS_PRESET_ATI_HDMI_NS },
        /* VIA VT8251/VT8237A */
        { PCI_DEVICE(0x1106, 0x3288), .driver_data = AZX_DRIVER_VIA },
        /* VIA GFX VT7122/VX900 */
        { PCI_DEVICE(0x1106, 0x9170), .driver_data = AZX_DRIVER_GENERIC },
        /* VIA GFX VT6122/VX11 */
        { PCI_DEVICE(0x1106, 0x9140), .driver_data = AZX_DRIVER_GENERIC },
        /* SIS966 */
        { PCI_DEVICE(0x1039, 0x7502), .driver_data = AZX_DRIVER_SIS },
        /* ULI M5461 */
        { PCI_DEVICE(0x10b9, 0x5461), .driver_data = AZX_DRIVER_ULI },
        /* NVIDIA MCP */
        { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID),
          .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
          .class_mask = 0xffffff,
          .driver_data = AZX_DRIVER_NVIDIA | AZX_DCAPS_PRESET_NVIDIA },
        /* Teradici */
        { PCI_DEVICE(0x6549, 0x1200),
          .driver_data = AZX_DRIVER_TERA | AZX_DCAPS_NO_64BIT },
        { PCI_DEVICE(0x6549, 0x2200),
          .driver_data = AZX_DRIVER_TERA | AZX_DCAPS_NO_64BIT },
        /* Creative X-Fi (CA0110-IBG) */
        /* CTHDA chips */
        { PCI_DEVICE(0x1102, 0x0010),
          .driver_data = AZX_DRIVER_CTHDA | AZX_DCAPS_PRESET_CTHDA },
        { PCI_DEVICE(0x1102, 0x0012),
          .driver_data = AZX_DRIVER_CTHDA | AZX_DCAPS_PRESET_CTHDA },
#if !IS_ENABLED(CONFIG_SND_CTXFI)
        /* the following entry conflicts with snd-ctxfi driver,
         * as ctxfi driver mutates from HD-audio to native mode with
         * a special command sequence.
         */
        { PCI_DEVICE(PCI_VENDOR_ID_CREATIVE, PCI_ANY_ID),
          .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
          .class_mask = 0xffffff,
          .driver_data = AZX_DRIVER_CTX | AZX_DCAPS_CTX_WORKAROUND |
          AZX_DCAPS_NO_64BIT | AZX_DCAPS_POSFIX_LPIB },
#else
        /* this entry seems still valid -- i.e. without emu20kx chip */
        { PCI_DEVICE(0x1102, 0x0009),
          .driver_data = AZX_DRIVER_CTX | AZX_DCAPS_CTX_WORKAROUND |
          AZX_DCAPS_NO_64BIT | AZX_DCAPS_POSFIX_LPIB },
#endif
        /* CM8888 */
        { PCI_DEVICE(0x13f6, 0x5011),
          .driver_data = AZX_DRIVER_CMEDIA |
          AZX_DCAPS_NO_MSI | AZX_DCAPS_POSFIX_LPIB | AZX_DCAPS_SNOOP_OFF },
        /* Vortex86MX */
        { PCI_DEVICE(0x17f3, 0x3010), .driver_data = AZX_DRIVER_GENERIC },
        /* VMware HDAudio */
        { PCI_DEVICE(0x15ad, 0x1977), .driver_data = AZX_DRIVER_GENERIC },
        /* AMD/ATI Generic, PCI class code and Vendor ID for HD Audio */
        { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_ANY_ID),
          .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
          .class_mask = 0xffffff,
          .driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_HDMI },
        { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_ANY_ID),
          .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
          .class_mask = 0xffffff,
          .driver_data = AZX_DRIVER_GENERIC | AZX_DCAPS_PRESET_ATI_HDMI },
        { 0, }
};
MODULE_DEVICE_TABLE(pci, azx_ids);

/* pci_driver definition */
static struct pci_driver azx_driver = {
        .name = KBUILD_MODNAME,
        .id_table = azx_ids,
        .probe = azx_probe,
        .remove = azx_remove,
        .shutdown = azx_shutdown,
        .driver = {
                .pm = AZX_PM_OPS,
        },
};

module_pci_driver(azx_driver);