Re: [alsa-devel] [PATCH v2] ASoC: max98090: save and restore SHDN when changing sensitive registers

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Hi,

On 12.12.2019 15:09, Marek Szyprowski wrote:
> Hi,
>
> On 28.11.2019 16:19, Tzung-Bi Shih wrote:
>> According to the datasheet, there are some registers can only be changed
>> when SHDN is 0.  Changing these settings during SHDN = 1 can compromise
>> device stability and performance specifications.
>>
>> Saves SHDN before writing to these sensitive registers and restores SHDN
>> afterward.
>>
>> Here is the register list codec driver of max98090 wants to change:
>> M98090_REG_QUICK_SYSTEM_CLOCK        0x04
>> M98090_REG_QUICK_SAMPLE_RATE        0x05
>> M98090_REG_DAI_INTERFACE        0x06
>> M98090_REG_DAC_PATH            0x07
>> M98090_REG_MIC_DIRECT_TO_ADC        0x08
>> M98090_REG_LINE_TO_ADC            0x09
>> M98090_REG_ANALOG_MIC_LOOP        0x0A
>> M98090_REG_ANALOG_LINE_LOOP        0x0B
>> M98090_REG_SYSTEM_CLOCK            0x1B
>> M98090_REG_CLOCK_MODE            0x1C
>> M98090_REG_CLOCK_RATIO_NI_MSB        0x1D
>> M98090_REG_CLOCK_RATIO_NI_LSB        0x1E
>> M98090_REG_CLOCK_RATIO_MI_MSB        0x1F
>> M98090_REG_CLOCK_RATIO_MI_LSB        0x20
>> M98090_REG_MASTER_MODE            0x21
>> M98090_REG_INTERFACE_FORMAT        0x22
>> M98090_REG_TDM_CONTROL            0x23
>> M98090_REG_TDM_FORMAT            0x24
>> M98090_REG_IO_CONFIGURATION        0x25
>> M98090_REG_FILTER_CONFIG        0x26
>> M98090_REG_INPUT_ENABLE            0x3E
>> M98090_REG_OUTPUT_ENABLE        0x3F
>> M98090_REG_BIAS_CONTROL            0x42
>> M98090_REG_DAC_CONTROL            0x43
>> M98090_REG_ADC_CONTROL            0x44
>> M98090_REG_DRC_TIMING            0x33
>> M98090_REG_DRC_COMPRESSOR        0x34
>> M98090_REG_DRC_EXPANDER            0x35
>> M98090_REG_DSP_FILTER_ENABLE        0x41
>> M98090_REG_EQUALIZER_BASE        0x46
>> M98090_REG_RECORD_BIQUAD_BASE        0xAF
>> M98090_REG_DIGITAL_MIC_ENABLE        0x13
>> M98090_REG_DIGITAL_MIC_CONFIG        0x14
>>
>> Signed-off-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
>
> Today I've noticed that this patch got merged to linux-next as commit 
> 62d5ae4cafb7ffeeec6ba2dd1814cafeeea7dd8f. Sadly it breaks codec 
> operation on some Samsung Exynos SoC based boards: Odroid U3, XU, XU3 
> and Chromebook Peach-Pit/Pi. I get the following errors during boot:
>
> ======================================================
> WARNING: possible circular locking dependency detected
> 5.5.0-rc1-next-20191212 #86 Not tainted
> ------------------------------------------------------
> alsactl/265 is trying to acquire lock:
> eda820f4 (&card->dapm_mutex){+.+.}, at: max98090_shdn_save+0x1c/0x28
>
> but task is already holding lock:
> eda5249c (&card->controls_rwsem){++++}, at: snd_ctl_ioctl+0xcc/0xbb8
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
> dwmmc_exynos 12200000.mmc: Unexpected interrupt latency
>
> -> #1 (&card->controls_rwsem){++++}:
>        snd_ctl_add_replace+0x3c/0x84
>        dapm_create_or_share_kcontrol+0x24c/0x2e0
>        snd_soc_dapm_new_widgets+0x308/0x594
>        snd_soc_bind_card+0x80c/0xac8
>        devm_snd_soc_register_card+0x34/0x6c
>        asoc_simple_probe+0x244/0x4a0
>        platform_drv_probe+0x6c/0xa4
>        really_probe+0x200/0x490
>        driver_probe_device+0x78/0x1f8
>        bus_for_each_drv+0x74/0xb8
>        __device_attach+0xd4/0x16c
>        bus_probe_device+0x88/0x90
>        deferred_probe_work_func+0x3c/0xd0
>        process_one_work+0x22c/0x7c4
>        worker_thread+0x44/0x524
>        kthread+0x130/0x164
>        ret_from_fork+0x14/0x20
>        0x0
>
> -> #0 (&card->dapm_mutex){+.+.}:
>        lock_acquire+0xe8/0x270
>        __mutex_lock+0x9c/0xb18
>        mutex_lock_nested+0x1c/0x24
>        max98090_shdn_save+0x1c/0x28
>        max98090_put_enum_double+0x20/0x40
>        snd_ctl_ioctl+0x190/0xbb8
>        do_vfs_ioctl+0xb0/0xab0
>        ksys_ioctl+0x34/0x5c
>        ret_fast_syscall+0x0/0x28
>        0xbe9094dc
>
> other info that might help us debug this:
>
>  Possible unsafe locking scenario:
>
>        CPU0                    CPU1
>        ----                    ----
>   lock(&card->controls_rwsem);
>                                lock(&card->dapm_mutex);
>                                lock(&card->controls_rwsem);
>   lock(&card->dapm_mutex);
>
>  *** DEADLOCK ***
>
> 1 lock held by alsactl/265:
>  #0: eda5249c (&card->controls_rwsem){++++}, at: snd_ctl_ioctl+0xcc/0xbb8
>
> stack backtrace:
> CPU: 0 PID: 265 Comm: alsactl Not tainted 5.5.0-rc1-next-20191212 #86
> Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [<c0112570>] (unwind_backtrace) from [<c010e05c>] (show_stack+0x10/0x14)
> [<c010e05c>] (show_stack) from [<c0b1f15c>] (dump_stack+0xb4/0xe0)
> [<c0b1f15c>] (dump_stack) from [<c0189eac>] 
> (check_noncircular+0x1ec/0x208)
> [<c0189eac>] (check_noncircular) from [<c018c2c8>] 
> (__lock_acquire+0x1210/0x25ec)
> [<c018c2c8>] (__lock_acquire) from [<c018dfc4>] (lock_acquire+0xe8/0x270)
> [<c018dfc4>] (lock_acquire) from [<c0b3fc30>] (__mutex_lock+0x9c/0xb18)
> [<c0b3fc30>] (__mutex_lock) from [<c0b406c8>] 
> (mutex_lock_nested+0x1c/0x24)
> [<c0b406c8>] (mutex_lock_nested) from [<c0833988>] 
> (max98090_shdn_save+0x1c/0x28)
> [<c0833988>] (max98090_shdn_save) from [<c0834404>] 
> (max98090_put_enum_double+0x20/0x40)
> [<c0834404>] (max98090_put_enum_double) from [<c0807970>] 
> (snd_ctl_ioctl+0x190/0xbb8)
> [<c0807970>] (snd_ctl_ioctl) from [<c02ca0bc>] (do_vfs_ioctl+0xb0/0xab0)
> [<c02ca0bc>] (do_vfs_ioctl) from [<c02caaf0>] (ksys_ioctl+0x34/0x5c)
> [<c02caaf0>] (ksys_ioctl) from [<c0101000>] (ret_fast_syscall+0x0/0x28)
> Exception stack(0xec471fa8 to 0xec471ff0)
> ...
>
> 8<--- cut here ---
> Unable to handle kernel NULL pointer dereference at virtual address 
> 000000b0
> pgd = (ptrval)
> [000000b0] *pgd=00000000
> Internal error: Oops: 5 [#1] PREEMPT SMP ARM
> Modules linked in:
> CPU: 0 PID: 265 Comm: alsactl Not tainted 5.5.0-rc1-next-20191212 #86
> Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> PC is at __mutex_lock+0x54/0xb18
> LR is at ___might_sleep+0x3c/0x2e0
> pc : [<c0b3fbe8>]    lr : [<c01585a8>]    psr: 60000013
> sp : ec471e00  ip : e85b2e05  fp : eda8b280
> r10: eda52464  r9 : eda52000  r8 : be909618
> r7 : c1916644  r6 : 00000000  r5 : 00000000  r4 : 00000080
> r3 : 00000000  r2 : 00400000  r1 : 000003aa  r0 : 00000000
> Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> Control: 10c5387d  Table: 6c62c06a  DAC: 00000051
> Process alsactl (pid: 265, stack limit = 0x(ptrval))
> Stack: (0xec471e00 to 0xec472000)
> ...
> [<c0b3fbe8>] (__mutex_lock) from [<c0b406c8>] 
> (mutex_lock_nested+0x1c/0x24)
> [<c0b406c8>] (mutex_lock_nested) from [<c0833988>] 
> (max98090_shdn_save+0x1c/0x28)
> [<c0833988>] (max98090_shdn_save) from [<c0834344>] 
> (max98090_dapm_put_enum_double+0x20/0x40)
> [<c0834344>] (max98090_dapm_put_enum_double) from [<c0807970>] 
> (snd_ctl_ioctl+0x190/0xbb8)
> [<c0807970>] (snd_ctl_ioctl) from [<c02ca0bc>] (do_vfs_ioctl+0xb0/0xab0)
> [<c02ca0bc>] (do_vfs_ioctl) from [<c02caaf0>] (ksys_ioctl+0x34/0x5c)
> [<c02caaf0>] (ksys_ioctl) from [<c0101000>] (ret_fast_syscall+0x0/0x28)
> Exception stack(0xec471fa8 to 0xec471ff0)
> 1fa0:                   00000001 00000000 00000003 c2c85513 be909618 
> 00472620
> 1fc0: 00000001 00000000 00000002 00000036 00000002 be909510 00000003 
> be90996c
> 1fe0: b6f487c4 be9094dc b6e8d3a0 b6cda79c
> Code: ebd8631b e5973000 e3530000 1a000002 (e5943030)
> ---[ end trace 376d2de2786690d7 ]---
>
> The only strange thing is that Chromebook Snow, which also use this 
> codec boots fine.
>
>> ---
>> This patch is a follow up fix for the question:
>> https://mailman.alsa-project.org/pipermail/alsa-devel/2019-October/157364.html 
>>
>>
>> Changes from v1:
>> https://mailman.alsa-project.org/pipermail/alsa-devel/2019-November/158855.html 
>>
>> - fix a typo in commit message
>> - rebase to the latest for-next (a few line numbers changed)
>>
>>   sound/soc/codecs/max98090.c | 433 ++++++++++++++++++++++++++----------
>>   sound/soc/codecs/max98090.h |   3 +-
>>   2 files changed, 312 insertions(+), 124 deletions(-)
>>
>> diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c
>> index e46b6ada13b1..da23810f958e 100644
>> --- a/sound/soc/codecs/max98090.c
>> +++ b/sound/soc/codecs/max98090.c
>> @@ -5,24 +5,149 @@
>>    * Copyright 2011-2012 Maxim Integrated Products
>>    */
>>   +#include <linux/acpi.h>
>> +#include <linux/clk.h>
>>   #include <linux/delay.h>
>>   #include <linux/i2c.h>
>>   #include <linux/module.h>
>> +#include <linux/mutex.h>
>>   #include <linux/of.h>
>>   #include <linux/pm.h>
>>   #include <linux/pm_runtime.h>
>>   #include <linux/regmap.h>
>>   #include <linux/slab.h>
>> -#include <linux/acpi.h>
>> -#include <linux/clk.h>
>>   #include <sound/jack.h>
>> +#include <sound/max98090.h>
>>   #include <sound/pcm.h>
>>   #include <sound/pcm_params.h>
>>   #include <sound/soc.h>
>>   #include <sound/tlv.h>
>> -#include <sound/max98090.h>
>>   #include "max98090.h"
>>   +static void max98090_shdn_save_locked(struct max98090_priv *max98090)
>> +{
>> +    int shdn = 0;
>> +
>> +    /* saved_shdn, saved_count, SHDN are protected by 
>> card->dapm_mutex */
>> +    regmap_read(max98090->regmap, M98090_REG_DEVICE_SHUTDOWN, &shdn);
>> +    max98090->saved_shdn |= shdn;
>> +    ++max98090->saved_count;
>> +
>> +    if (shdn)
>> +        regmap_write(max98090->regmap, M98090_REG_DEVICE_SHUTDOWN, 
>> 0x0);
>> +}
>> +
>> +static void max98090_shdn_restore_locked(struct max98090_priv 
>> *max98090)
>> +{
>> +    /* saved_shdn, saved_count, SHDN are protected by 
>> card->dapm_mutex */
>> +    if (--max98090->saved_count == 0) {
>> +        if (max98090->saved_shdn) {
>> +            regmap_write(max98090->regmap,
>> +                     M98090_REG_DEVICE_SHUTDOWN,
>> +                     M98090_SHDNN_MASK);
>> +            max98090->saved_shdn = 0;
>> +        }
>> +    }
>> +}
>> +
>> +static void max98090_shdn_save(struct max98090_priv *max98090)
>> +{
>> + mutex_lock(&max98090->component->card->dapm_mutex);

The NULL pointer dereference demonstrated above is caused by 
max98090->component->card being NULL here. Adding a simple != NULL check 
here and in the max98090_shdn_restore() function fixes the boot issue, 
although the deplock warning is still there. The question is that is the 
max98090->component->card being NULL is a normal case or something that 
needs further analysis.

>> +    max98090_shdn_save_locked(max98090);
>> +}
>> +
>> +static void max98090_shdn_restore(struct max98090_priv *max98090)
>> +{
>> +    max98090_shdn_restore_locked(max98090);
>> + mutex_unlock(&max98090->component->card->dapm_mutex);
>> +}
>> +
>> +static int max98090_put_volsw(struct snd_kcontrol *kcontrol,
>> +    struct snd_ctl_elem_value *ucontrol)
>> +{
>> +    struct snd_soc_component *component =
>> +        snd_soc_kcontrol_component(kcontrol);
>> +    struct max98090_priv *max98090 =
>> +        snd_soc_component_get_drvdata(component);
>> +    int ret;
>> +
>> +    max98090_shdn_save(max98090);
>> +    ret = snd_soc_put_volsw(kcontrol, ucontrol);
>> +    max98090_shdn_restore(max98090);
>> +
>> +    return ret;
>> +}
>> +
>> +static int max98090_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
>> +    struct snd_ctl_elem_value *ucontrol)
>> +{
>> +    struct snd_soc_component *component =
>> +        snd_soc_kcontrol_component(kcontrol);
>> +    struct max98090_priv *max98090 =
>> +        snd_soc_component_get_drvdata(component);
>> +    int ret;
>> +
>> +    max98090_shdn_save(max98090);
>> +    ret = snd_soc_dapm_put_enum_double(kcontrol, ucontrol);
>> +    max98090_shdn_restore(max98090);
>> +
>> +    return ret;
>> +}
>> +
>> +static int max98090_put_enum_double(struct snd_kcontrol *kcontrol,
>> +    struct snd_ctl_elem_value *ucontrol)
>> +{
>> +    struct snd_soc_component *component =
>> +        snd_soc_kcontrol_component(kcontrol);
>> +    struct max98090_priv *max98090 =
>> +        snd_soc_component_get_drvdata(component);
>> +    int ret;
>> +
>> +    max98090_shdn_save(max98090);
>> +    ret = snd_soc_put_enum_double(kcontrol, ucontrol);
>> +    max98090_shdn_restore(max98090);
>> +
>> +    return ret;
>> +}
>> +
>> +static int max98090_bytes_put(struct snd_kcontrol *kcontrol,
>> +    struct snd_ctl_elem_value *ucontrol)
>> +{
>> +    struct snd_soc_component *component =
>> +        snd_soc_kcontrol_component(kcontrol);
>> +    struct max98090_priv *max98090 =
>> +        snd_soc_component_get_drvdata(component);
>> +    int ret;
>> +
>> +    max98090_shdn_save(max98090);
>> +    ret = snd_soc_bytes_put(kcontrol, ucontrol);
>> +    max98090_shdn_restore(max98090);
>> +
>> +    return ret;
>> +}
>> +
>> +static int max98090_dapm_event(struct snd_soc_dapm_widget *w,
>> +    struct snd_kcontrol *kcontrol, int event)
>> +{
>> +    struct snd_soc_component *component =
>> +        snd_soc_dapm_to_component(w->dapm);
>> +    struct max98090_priv *max98090 =
>> +        snd_soc_component_get_drvdata(component);
>> +
>> +    switch (event) {
>> +    case SND_SOC_DAPM_PRE_PMU:
>> +    case SND_SOC_DAPM_PRE_PMD:
>> +        max98090_shdn_save_locked(max98090);
>> +        break;
>> +    case SND_SOC_DAPM_POST_PMU:
>> +    case SND_SOC_DAPM_POST_PMD:
>> +        max98090_shdn_restore_locked(max98090);
>> +        break;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>>   /* Allows for sparsely populated register maps */
>>   static const struct reg_default max98090_reg[] = {
>>       { 0x00, 0x00 }, /* 00 Software Reset */
>> @@ -506,10 +631,13 @@ static SOC_ENUM_SINGLE_DECL(max98090_adchp_enum,
>>                   max98090_pwr_perf_text);
>>     static const struct snd_kcontrol_new max98090_snd_controls[] = {
>> -    SOC_ENUM("MIC Bias VCM Bandgap", max98090_vcmbandgap_enum),
>> +    SOC_ENUM_EXT("MIC Bias VCM Bandgap", max98090_vcmbandgap_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>>   -    SOC_SINGLE("DMIC MIC Comp Filter Config", 
>> M98090_REG_DIGITAL_MIC_CONFIG,
>> -        M98090_DMIC_COMP_SHIFT, M98090_DMIC_COMP_NUM - 1, 0),
>> +    SOC_SINGLE_EXT("DMIC MIC Comp Filter Config",
>> +        M98090_REG_DIGITAL_MIC_CONFIG,
>> +        M98090_DMIC_COMP_SHIFT, M98090_DMIC_COMP_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>>         SOC_SINGLE_EXT_TLV("MIC1 Boost Volume",
>>           M98090_REG_MIC1_INPUT_LEVEL, M98090_MIC_PA1EN_SHIFT,
>> @@ -564,24 +692,34 @@ static const struct snd_kcontrol_new 
>> max98090_snd_controls[] = {
>>           M98090_AVR_SHIFT, M98090_AVR_NUM - 1, 1,
>>           max98090_av_tlv),
>>   -    SOC_ENUM("ADC Oversampling Rate", max98090_osr128_enum),
>> -    SOC_SINGLE("ADC Quantizer Dither", M98090_REG_ADC_CONTROL,
>> -        M98090_ADCDITHER_SHIFT, M98090_ADCDITHER_NUM - 1, 0),
>> -    SOC_ENUM("ADC High Performance Mode", max98090_adchp_enum),
>> -
>> -    SOC_SINGLE("DAC Mono Mode", M98090_REG_IO_CONFIGURATION,
>> -        M98090_DMONO_SHIFT, M98090_DMONO_NUM - 1, 0),
>> -    SOC_SINGLE("SDIN Mode", M98090_REG_IO_CONFIGURATION,
>> -        M98090_SDIEN_SHIFT, M98090_SDIEN_NUM - 1, 0),
>> -    SOC_SINGLE("SDOUT Mode", M98090_REG_IO_CONFIGURATION,
>> -        M98090_SDOEN_SHIFT, M98090_SDOEN_NUM - 1, 0),
>> -    SOC_SINGLE("SDOUT Hi-Z Mode", M98090_REG_IO_CONFIGURATION,
>> -        M98090_HIZOFF_SHIFT, M98090_HIZOFF_NUM - 1, 1),
>> -    SOC_ENUM("Filter Mode", max98090_mode_enum),
>> -    SOC_SINGLE("Record Path DC Blocking", M98090_REG_FILTER_CONFIG,
>> -        M98090_AHPF_SHIFT, M98090_AHPF_NUM - 1, 0),
>> -    SOC_SINGLE("Playback Path DC Blocking", M98090_REG_FILTER_CONFIG,
>> -        M98090_DHPF_SHIFT, M98090_DHPF_NUM - 1, 0),
>> +    SOC_ENUM_EXT("ADC Oversampling Rate", max98090_osr128_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +    SOC_SINGLE_EXT("ADC Quantizer Dither", M98090_REG_ADC_CONTROL,
>> +        M98090_ADCDITHER_SHIFT, M98090_ADCDITHER_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_ENUM_EXT("ADC High Performance Mode", max98090_adchp_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +
>> +    SOC_SINGLE_EXT("DAC Mono Mode", M98090_REG_IO_CONFIGURATION,
>> +        M98090_DMONO_SHIFT, M98090_DMONO_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_SINGLE_EXT("SDIN Mode", M98090_REG_IO_CONFIGURATION,
>> +        M98090_SDIEN_SHIFT, M98090_SDIEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_SINGLE_EXT("SDOUT Mode", M98090_REG_IO_CONFIGURATION,
>> +        M98090_SDOEN_SHIFT, M98090_SDOEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_SINGLE_EXT("SDOUT Hi-Z Mode", M98090_REG_IO_CONFIGURATION,
>> +        M98090_HIZOFF_SHIFT, M98090_HIZOFF_NUM - 1, 1,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_ENUM_EXT("Filter Mode", max98090_mode_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +    SOC_SINGLE_EXT("Record Path DC Blocking", M98090_REG_FILTER_CONFIG,
>> +        M98090_AHPF_SHIFT, M98090_AHPF_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_SINGLE_EXT("Playback Path DC Blocking", 
>> M98090_REG_FILTER_CONFIG,
>> +        M98090_DHPF_SHIFT, M98090_DHPF_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>>       SOC_SINGLE_TLV("Digital BQ Volume", M98090_REG_ADC_BIQUAD_LEVEL,
>>           M98090_AVBQ_SHIFT, M98090_AVBQ_NUM - 1, 1, max98090_dv_tlv),
>>       SOC_SINGLE_EXT_TLV("Digital Sidetone Volume",
>> @@ -594,13 +732,17 @@ static const struct snd_kcontrol_new 
>> max98090_snd_controls[] = {
>>       SOC_SINGLE_TLV("Digital Volume", M98090_REG_DAI_PLAYBACK_LEVEL,
>>           M98090_DV_SHIFT, M98090_DV_NUM - 1, 1,
>>           max98090_dv_tlv),
>> -    SND_SOC_BYTES("EQ Coefficients", M98090_REG_EQUALIZER_BASE, 105),
>> -    SOC_SINGLE("Digital EQ 3 Band Switch", 
>> M98090_REG_DSP_FILTER_ENABLE,
>> -        M98090_EQ3BANDEN_SHIFT, M98090_EQ3BANDEN_NUM - 1, 0),
>> -    SOC_SINGLE("Digital EQ 5 Band Switch", 
>> M98090_REG_DSP_FILTER_ENABLE,
>> -        M98090_EQ5BANDEN_SHIFT, M98090_EQ5BANDEN_NUM - 1, 0),
>> -    SOC_SINGLE("Digital EQ 7 Band Switch", 
>> M98090_REG_DSP_FILTER_ENABLE,
>> -        M98090_EQ7BANDEN_SHIFT, M98090_EQ7BANDEN_NUM - 1, 0),
>> +    SND_SOC_BYTES_E("EQ Coefficients", M98090_REG_EQUALIZER_BASE, 105,
>> +        snd_soc_bytes_get, max98090_bytes_put),
>> +    SOC_SINGLE_EXT("Digital EQ 3 Band Switch", 
>> M98090_REG_DSP_FILTER_ENABLE,
>> +        M98090_EQ3BANDEN_SHIFT, M98090_EQ3BANDEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_SINGLE_EXT("Digital EQ 5 Band Switch", 
>> M98090_REG_DSP_FILTER_ENABLE,
>> +        M98090_EQ5BANDEN_SHIFT, M98090_EQ5BANDEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_SINGLE_EXT("Digital EQ 7 Band Switch", 
>> M98090_REG_DSP_FILTER_ENABLE,
>> +        M98090_EQ7BANDEN_SHIFT, M98090_EQ7BANDEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>>       SOC_SINGLE("Digital EQ Clipping Detection", 
>> M98090_REG_DAI_PLAYBACK_LEVEL_EQ,
>>           M98090_EQCLPN_SHIFT, M98090_EQCLPN_NUM - 1,
>>           1),
>> @@ -608,25 +750,34 @@ static const struct snd_kcontrol_new 
>> max98090_snd_controls[] = {
>>           M98090_DVEQ_SHIFT, M98090_DVEQ_NUM - 1, 1,
>>           max98090_dv_tlv),
>>   -    SOC_SINGLE("ALC Enable", M98090_REG_DRC_TIMING,
>> -        M98090_DRCEN_SHIFT, M98090_DRCEN_NUM - 1, 0),
>> -    SOC_ENUM("ALC Attack Time", max98090_drcatk_enum),
>> -    SOC_ENUM("ALC Release Time", max98090_drcrls_enum),
>> +    SOC_SINGLE_EXT("ALC Enable", M98090_REG_DRC_TIMING,
>> +        M98090_DRCEN_SHIFT, M98090_DRCEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>> +    SOC_ENUM_EXT("ALC Attack Time", max98090_drcatk_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +    SOC_ENUM_EXT("ALC Release Time", max98090_drcrls_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>>       SOC_SINGLE_TLV("ALC Make Up Volume", M98090_REG_DRC_GAIN,
>>           M98090_DRCG_SHIFT, M98090_DRCG_NUM - 1, 0,
>>           max98090_alcmakeup_tlv),
>> -    SOC_ENUM("ALC Compression Ratio", max98090_alccmp_enum),
>> -    SOC_ENUM("ALC Expansion Ratio", max98090_drcexp_enum),
>> -    SOC_SINGLE_TLV("ALC Compression Threshold Volume",
>> +    SOC_ENUM_EXT("ALC Compression Ratio", max98090_alccmp_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +    SOC_ENUM_EXT("ALC Expansion Ratio", max98090_drcexp_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +    SOC_SINGLE_EXT_TLV("ALC Compression Threshold Volume",
>>           M98090_REG_DRC_COMPRESSOR, M98090_DRCTHC_SHIFT,
>> -        M98090_DRCTHC_NUM - 1, 1, max98090_alccomp_tlv),
>> -    SOC_SINGLE_TLV("ALC Expansion Threshold Volume",
>> +        M98090_DRCTHC_NUM - 1, 1,
>> +        snd_soc_get_volsw, max98090_put_volsw, max98090_alccomp_tlv),
>> +    SOC_SINGLE_EXT_TLV("ALC Expansion Threshold Volume",
>>           M98090_REG_DRC_EXPANDER, M98090_DRCTHE_SHIFT,
>> -        M98090_DRCTHE_NUM - 1, 1, max98090_drcexp_tlv),
>> +        M98090_DRCTHE_NUM - 1, 1,
>> +        snd_soc_get_volsw, max98090_put_volsw, max98090_drcexp_tlv),
>>   -    SOC_ENUM("DAC HP Playback Performance Mode",
>> -        max98090_dac_perfmode_enum),
>> -    SOC_ENUM("DAC High Performance Mode", max98090_dachp_enum),
>> +    SOC_ENUM_EXT("DAC HP Playback Performance Mode",
>> +        max98090_dac_perfmode_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +    SOC_ENUM_EXT("DAC High Performance Mode", max98090_dachp_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>>         SOC_SINGLE_TLV("Headphone Left Mixer Volume",
>>           M98090_REG_HP_CONTROL, M98090_MIXHPLG_SHIFT,
>> @@ -684,9 +835,12 @@ static const struct snd_kcontrol_new 
>> max98090_snd_controls[] = {
>>       SOC_SINGLE("Volume Adjustment Smoothing", 
>> M98090_REG_LEVEL_CONTROL,
>>           M98090_VSENN_SHIFT, M98090_VSENN_NUM - 1, 1),
>>   -    SND_SOC_BYTES("Biquad Coefficients", 
>> M98090_REG_RECORD_BIQUAD_BASE, 15),
>> -    SOC_SINGLE("Biquad Switch", M98090_REG_DSP_FILTER_ENABLE,
>> -        M98090_ADCBQEN_SHIFT, M98090_ADCBQEN_NUM - 1, 0),
>> +    SND_SOC_BYTES_E("Biquad Coefficients",
>> +        M98090_REG_RECORD_BIQUAD_BASE, 15,
>> +        snd_soc_bytes_get, max98090_bytes_put),
>> +    SOC_SINGLE_EXT("Biquad Switch", M98090_REG_DSP_FILTER_ENABLE,
>> +        M98090_ADCBQEN_SHIFT, M98090_ADCBQEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>>   };
>>     static const struct snd_kcontrol_new max98091_snd_controls[] = {
>> @@ -695,10 +849,12 @@ static const struct snd_kcontrol_new 
>> max98091_snd_controls[] = {
>>           M98090_DMIC34_ZEROPAD_SHIFT,
>>           M98090_DMIC34_ZEROPAD_NUM - 1, 0),
>>   -    SOC_ENUM("Filter DMIC34 Mode", max98090_filter_dmic34mode_enum),
>> -    SOC_SINGLE("DMIC34 DC Blocking", M98090_REG_FILTER_CONFIG,
>> +    SOC_ENUM_EXT("Filter DMIC34 Mode", max98090_filter_dmic34mode_enum,
>> +        snd_soc_get_enum_double, max98090_put_enum_double),
>> +    SOC_SINGLE_EXT("DMIC34 DC Blocking", M98090_REG_FILTER_CONFIG,
>>           M98090_FLT_DMIC34HPF_SHIFT,
>> -        M98090_FLT_DMIC34HPF_NUM - 1, 0),
>> +        M98090_FLT_DMIC34HPF_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>>         SOC_SINGLE_TLV("DMIC3 Boost Volume", M98090_REG_DMIC3_VOLUME,
>>           M98090_DMIC_AV3G_SHIFT, M98090_DMIC_AV3G_NUM - 1, 0,
>> @@ -716,8 +872,9 @@ static const struct snd_kcontrol_new 
>> max98091_snd_controls[] = {
>>         SND_SOC_BYTES("DMIC34 Biquad Coefficients",
>>           M98090_REG_DMIC34_BIQUAD_BASE, 15),
>> -    SOC_SINGLE("DMIC34 Biquad Switch", M98090_REG_DSP_FILTER_ENABLE,
>> -        M98090_DMIC34BQEN_SHIFT, M98090_DMIC34BQEN_NUM - 1, 0),
>> +    SOC_SINGLE_EXT("DMIC34 Biquad Switch", 
>> M98090_REG_DSP_FILTER_ENABLE,
>> +        M98090_DMIC34BQEN_SHIFT, M98090_DMIC34BQEN_NUM - 1, 0,
>> +        snd_soc_get_volsw, max98090_put_volsw),
>>         SOC_SINGLE_TLV("DMIC34 BQ PreAttenuation Volume",
>>           M98090_REG_DMIC34_BQ_PREATTEN, M98090_AV34BQ_SHIFT,
>> @@ -771,19 +928,6 @@ static int max98090_micinput_event(struct 
>> snd_soc_dapm_widget *w,
>>       return 0;
>>   }
>>   -static int max98090_shdn_event(struct snd_soc_dapm_widget *w,
>> -                 struct snd_kcontrol *kcontrol, int event)
>> -{
>> -    struct snd_soc_component *component = 
>> snd_soc_dapm_to_component(w->dapm);
>> -    struct max98090_priv *max98090 = 
>> snd_soc_component_get_drvdata(component);
>> -
>> -    if (event & SND_SOC_DAPM_POST_PMU)
>> -        max98090->shdn_pending = true;
>> -
>> -    return 0;
>> -
>> -}
>> -
>>   static const char *mic1_mux_text[] = { "IN12", "IN56" };
>>     static SOC_ENUM_SINGLE_DECL(mic1_mux_enum,
>> @@ -884,10 +1028,14 @@ static SOC_ENUM_SINGLE_DECL(ltenr_mux_enum,
>>                   lten_mux_text);
>>     static const struct snd_kcontrol_new max98090_ltenl_mux =
>> -    SOC_DAPM_ENUM("LTENL Mux", ltenl_mux_enum);
>> +    SOC_DAPM_ENUM_EXT("LTENL Mux", ltenl_mux_enum,
>> +              snd_soc_dapm_get_enum_double,
>> +              max98090_dapm_put_enum_double);
>>     static const struct snd_kcontrol_new max98090_ltenr_mux =
>> -    SOC_DAPM_ENUM("LTENR Mux", ltenr_mux_enum);
>> +    SOC_DAPM_ENUM_EXT("LTENR Mux", ltenr_mux_enum,
>> +              snd_soc_dapm_get_enum_double,
>> +              max98090_dapm_put_enum_double);
>>     static const char *lben_mux_text[] = { "Normal", "Loopback" };
>>   @@ -902,10 +1050,14 @@ static SOC_ENUM_SINGLE_DECL(lbenr_mux_enum,
>>                   lben_mux_text);
>>     static const struct snd_kcontrol_new max98090_lbenl_mux =
>> -    SOC_DAPM_ENUM("LBENL Mux", lbenl_mux_enum);
>> +    SOC_DAPM_ENUM_EXT("LBENL Mux", lbenl_mux_enum,
>> +              snd_soc_dapm_get_enum_double,
>> +              max98090_dapm_put_enum_double);
>>     static const struct snd_kcontrol_new max98090_lbenr_mux =
>> -    SOC_DAPM_ENUM("LBENR Mux", lbenr_mux_enum);
>> +    SOC_DAPM_ENUM_EXT("LBENR Mux", lbenr_mux_enum,
>> +              snd_soc_dapm_get_enum_double,
>> +              max98090_dapm_put_enum_double);
>>     static const char *stenl_mux_text[] = { "Normal", "Sidetone Left" };
>>   @@ -1072,21 +1224,25 @@ static const struct snd_soc_dapm_widget 
>> max98090_dapm_widgets[] = {
>>       SND_SOC_DAPM_INPUT("IN56"),
>>         SND_SOC_DAPM_SUPPLY("MICBIAS", M98090_REG_INPUT_ENABLE,
>> -        M98090_MBEN_SHIFT, 0, NULL, 0),
>> +        M98090_MBEN_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>       SND_SOC_DAPM_SUPPLY("SHDN", M98090_REG_DEVICE_SHUTDOWN,
>>           M98090_SHDNN_SHIFT, 0, NULL, 0),
>>       SND_SOC_DAPM_SUPPLY("SDIEN", M98090_REG_IO_CONFIGURATION,
>> -        M98090_SDIEN_SHIFT, 0, NULL, 0),
>> +        M98090_SDIEN_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>       SND_SOC_DAPM_SUPPLY("SDOEN", M98090_REG_IO_CONFIGURATION,
>> -        M98090_SDOEN_SHIFT, 0, NULL, 0),
>> +        M98090_SDOEN_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>       SND_SOC_DAPM_SUPPLY("DMICL_ENA", M98090_REG_DIGITAL_MIC_ENABLE,
>> -         M98090_DIGMICL_SHIFT, 0, max98090_shdn_event,
>> -            SND_SOC_DAPM_POST_PMU),
>> +        M98090_DIGMICL_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>       SND_SOC_DAPM_SUPPLY("DMICR_ENA", M98090_REG_DIGITAL_MIC_ENABLE,
>> -         M98090_DIGMICR_SHIFT, 0, max98090_shdn_event,
>> -             SND_SOC_DAPM_POST_PMU),
>> +        M98090_DIGMICR_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>       SND_SOC_DAPM_SUPPLY("AHPF", M98090_REG_FILTER_CONFIG,
>> -        M98090_AHPF_SHIFT, 0, NULL, 0),
>> +        M98090_AHPF_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>     /*
>>    * Note: Sysclk and misc power supplies are taken care of by SHDN
>> @@ -1116,10 +1272,12 @@ static const struct snd_soc_dapm_widget 
>> max98090_dapm_widgets[] = {
>>           &max98090_lineb_mixer_controls[0],
>>           ARRAY_SIZE(max98090_lineb_mixer_controls)),
>>   -    SND_SOC_DAPM_PGA("LINEA Input", M98090_REG_INPUT_ENABLE,
>> -        M98090_LINEAEN_SHIFT, 0, NULL, 0),
>> -    SND_SOC_DAPM_PGA("LINEB Input", M98090_REG_INPUT_ENABLE,
>> -        M98090_LINEBEN_SHIFT, 0, NULL, 0),
>> +    SND_SOC_DAPM_PGA_E("LINEA Input", M98090_REG_INPUT_ENABLE,
>> +        M98090_LINEAEN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>> +    SND_SOC_DAPM_PGA_E("LINEB Input", M98090_REG_INPUT_ENABLE,
>> +        M98090_LINEBEN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>         SND_SOC_DAPM_MIXER("Left ADC Mixer", SND_SOC_NOPM, 0, 0,
>>           &max98090_left_adc_mixer_controls[0],
>> @@ -1130,11 +1288,11 @@ static const struct snd_soc_dapm_widget 
>> max98090_dapm_widgets[] = {
>>           ARRAY_SIZE(max98090_right_adc_mixer_controls)),
>>         SND_SOC_DAPM_ADC_E("ADCL", NULL, M98090_REG_INPUT_ENABLE,
>> -        M98090_ADLEN_SHIFT, 0, max98090_shdn_event,
>> -        SND_SOC_DAPM_POST_PMU),
>> +        M98090_ADLEN_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>       SND_SOC_DAPM_ADC_E("ADCR", NULL, M98090_REG_INPUT_ENABLE,
>> -        M98090_ADREN_SHIFT, 0, max98090_shdn_event,
>> -        SND_SOC_DAPM_POST_PMU),
>> +        M98090_ADREN_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>         SND_SOC_DAPM_AIF_OUT("AIFOUTL", "HiFi Capture", 0,
>>           SND_SOC_NOPM, 0, 0),
>> @@ -1162,10 +1320,12 @@ static const struct snd_soc_dapm_widget 
>> max98090_dapm_widgets[] = {
>>       SND_SOC_DAPM_AIF_IN("AIFINL", "HiFi Playback", 0, SND_SOC_NOPM, 
>> 0, 0),
>>       SND_SOC_DAPM_AIF_IN("AIFINR", "HiFi Playback", 1, SND_SOC_NOPM, 
>> 0, 0),
>>   -    SND_SOC_DAPM_DAC("DACL", NULL, M98090_REG_OUTPUT_ENABLE,
>> -        M98090_DALEN_SHIFT, 0),
>> -    SND_SOC_DAPM_DAC("DACR", NULL, M98090_REG_OUTPUT_ENABLE,
>> -        M98090_DAREN_SHIFT, 0),
>> +    SND_SOC_DAPM_DAC_E("DACL", NULL, M98090_REG_OUTPUT_ENABLE,
>> +        M98090_DALEN_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>> +    SND_SOC_DAPM_DAC_E("DACR", NULL, M98090_REG_OUTPUT_ENABLE,
>> +        M98090_DAREN_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>         SND_SOC_DAPM_MIXER("Left Headphone Mixer", SND_SOC_NOPM, 0, 0,
>>           &max98090_left_hp_mixer_controls[0],
>> @@ -1200,20 +1360,26 @@ static const struct snd_soc_dapm_widget 
>> max98090_dapm_widgets[] = {
>>       SND_SOC_DAPM_MUX("MIXHPRSEL Mux", SND_SOC_NOPM, 0, 0,
>>           &max98090_mixhprsel_mux),
>>   -    SND_SOC_DAPM_PGA("HP Left Out", M98090_REG_OUTPUT_ENABLE,
>> -        M98090_HPLEN_SHIFT, 0, NULL, 0),
>> -    SND_SOC_DAPM_PGA("HP Right Out", M98090_REG_OUTPUT_ENABLE,
>> -        M98090_HPREN_SHIFT, 0, NULL, 0),
>> -
>> -    SND_SOC_DAPM_PGA("SPK Left Out", M98090_REG_OUTPUT_ENABLE,
>> -        M98090_SPLEN_SHIFT, 0, NULL, 0),
>> -    SND_SOC_DAPM_PGA("SPK Right Out", M98090_REG_OUTPUT_ENABLE,
>> -        M98090_SPREN_SHIFT, 0, NULL, 0),
>> -
>> -    SND_SOC_DAPM_PGA("RCV Left Out", M98090_REG_OUTPUT_ENABLE,
>> -        M98090_RCVLEN_SHIFT, 0, NULL, 0),
>> -    SND_SOC_DAPM_PGA("RCV Right Out", M98090_REG_OUTPUT_ENABLE,
>> -        M98090_RCVREN_SHIFT, 0, NULL, 0),
>> +    SND_SOC_DAPM_PGA_E("HP Left Out", M98090_REG_OUTPUT_ENABLE,
>> +        M98090_HPLEN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>> +    SND_SOC_DAPM_PGA_E("HP Right Out", M98090_REG_OUTPUT_ENABLE,
>> +        M98090_HPREN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>> +
>> +    SND_SOC_DAPM_PGA_E("SPK Left Out", M98090_REG_OUTPUT_ENABLE,
>> +        M98090_SPLEN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>> +    SND_SOC_DAPM_PGA_E("SPK Right Out", M98090_REG_OUTPUT_ENABLE,
>> +        M98090_SPREN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>> +
>> +    SND_SOC_DAPM_PGA_E("RCV Left Out", M98090_REG_OUTPUT_ENABLE,
>> +        M98090_RCVLEN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>> +    SND_SOC_DAPM_PGA_E("RCV Right Out", M98090_REG_OUTPUT_ENABLE,
>> +        M98090_RCVREN_SHIFT, 0, NULL, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>         SND_SOC_DAPM_OUTPUT("HPL"),
>>       SND_SOC_DAPM_OUTPUT("HPR"),
>> @@ -1228,9 +1394,11 @@ static const struct snd_soc_dapm_widget 
>> max98091_dapm_widgets[] = {
>>       SND_SOC_DAPM_INPUT("DMIC4"),
>>         SND_SOC_DAPM_SUPPLY("DMIC3_ENA", M98090_REG_DIGITAL_MIC_ENABLE,
>> -         M98090_DIGMIC3_SHIFT, 0, NULL, 0),
>> +        M98090_DIGMIC3_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>       SND_SOC_DAPM_SUPPLY("DMIC4_ENA", M98090_REG_DIGITAL_MIC_ENABLE,
>> -         M98090_DIGMIC4_SHIFT, 0, NULL, 0),
>> +        M98090_DIGMIC4_SHIFT, 0, max98090_dapm_event,
>> +        SND_SOC_DAPM_PRE_POST_PMU | SND_SOC_DAPM_PRE_POST_PMD),
>>   };
>>     static const struct snd_soc_dapm_route max98090_dapm_routes[] = {
>> @@ -1501,6 +1669,11 @@ static void max98090_configure_bclk(struct 
>> snd_soc_component *component)
>>           return;
>>       }
>>   +    /*
>> +     * Master mode: no need to save and restore SHDN for the following
>> +     * sensitive registers.
>> +     */
>> +
>>       /* Check for supported PCLK to LRCLK ratios */
>>       for (i = 0; i < ARRAY_SIZE(pclk_rates); i++) {
>>           if ((pclk_rates[i] == max98090->sysclk) &&
>> @@ -1587,12 +1760,14 @@ static int max98090_dai_set_fmt(struct 
>> snd_soc_dai *codec_dai,
>>           switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
>>           case SND_SOC_DAIFMT_CBS_CFS:
>>               /* Set to slave mode PLL - MAS mode off */
>> +            max98090_shdn_save(max98090);
>>               snd_soc_component_write(component,
>>                   M98090_REG_CLOCK_RATIO_NI_MSB, 0x00);
>>               snd_soc_component_write(component,
>>                   M98090_REG_CLOCK_RATIO_NI_LSB, 0x00);
>>               snd_soc_component_update_bits(component, 
>> M98090_REG_CLOCK_MODE,
>>                   M98090_USE_M1_MASK, 0);
>> +            max98090_shdn_restore(max98090);
>>               max98090->master = false;
>>               break;
>>           case SND_SOC_DAIFMT_CBM_CFM:
>> @@ -1618,7 +1793,9 @@ static int max98090_dai_set_fmt(struct 
>> snd_soc_dai *codec_dai,
>>               dev_err(component->dev, "DAI clock mode unsupported");
>>               return -EINVAL;
>>           }
>> +        max98090_shdn_save(max98090);
>>           snd_soc_component_write(component, M98090_REG_MASTER_MODE, 
>> regval);
>> +        max98090_shdn_restore(max98090);
>>             regval = 0;
>>           switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
>> @@ -1663,8 +1840,10 @@ static int max98090_dai_set_fmt(struct 
>> snd_soc_dai *codec_dai,
>>           if (max98090->tdm_slots > 1)
>>               regval ^= M98090_BCI_MASK;
>>   +        max98090_shdn_save(max98090);
>>           snd_soc_component_write(component,
>>               M98090_REG_INTERFACE_FORMAT, regval);
>> +        max98090_shdn_restore(max98090);
>>       }
>>         return 0;
>> @@ -1676,6 +1855,7 @@ static int max98090_set_tdm_slot(struct 
>> snd_soc_dai *codec_dai,
>>       struct snd_soc_component *component = codec_dai->component;
>>       struct max98090_priv *max98090 = 
>> snd_soc_component_get_drvdata(component);
>>       struct max98090_cdata *cdata;
>> +
>>       cdata = &max98090->dai[0];
>>         if (slots < 0 || slots > 4)
>> @@ -1685,6 +1865,7 @@ static int max98090_set_tdm_slot(struct 
>> snd_soc_dai *codec_dai,
>>       max98090->tdm_width = slot_width;
>>         if (max98090->tdm_slots > 1) {
>> +        max98090_shdn_save(max98090);
>>           /* SLOTL SLOTR SLOTDLY */
>>           snd_soc_component_write(component, M98090_REG_TDM_FORMAT,
>>               0 << M98090_TDM_SLOTL_SHIFT |
>> @@ -1695,6 +1876,7 @@ static int max98090_set_tdm_slot(struct 
>> snd_soc_dai *codec_dai,
>>           snd_soc_component_update_bits(component, 
>> M98090_REG_TDM_CONTROL,
>>               M98090_TDM_MASK,
>>               M98090_TDM_MASK);
>> +        max98090_shdn_restore(max98090);
>>       }
>>         /*
>> @@ -1894,6 +2076,7 @@ static int max98090_configure_dmic(struct 
>> max98090_priv *max98090,
>>       dmic_freq = dmic_table[pclk_index].settings[micclk_index].freq;
>>       dmic_comp = dmic_table[pclk_index].settings[micclk_index].comp[i];
>>   +    max98090_shdn_save(max98090);
>>       regmap_update_bits(max98090->regmap, 
>> M98090_REG_DIGITAL_MIC_ENABLE,
>>                  M98090_MICCLK_MASK,
>>                  micclk_index << M98090_MICCLK_SHIFT);
>> @@ -1902,6 +2085,7 @@ static int max98090_configure_dmic(struct 
>> max98090_priv *max98090,
>>                  M98090_DMIC_COMP_MASK | M98090_DMIC_FREQ_MASK,
>>                  dmic_comp << M98090_DMIC_COMP_SHIFT |
>>                  dmic_freq << M98090_DMIC_FREQ_SHIFT);
>> +    max98090_shdn_restore(max98090);
>>         return 0;
>>   }
>> @@ -1938,8 +2122,10 @@ static int max98090_dai_hw_params(struct 
>> snd_pcm_substream *substream,
>>         switch (params_width(params)) {
>>       case 16:
>> +        max98090_shdn_save(max98090);
>>           snd_soc_component_update_bits(component, 
>> M98090_REG_INTERFACE_FORMAT,
>>               M98090_WS_MASK, 0);
>> +        max98090_shdn_restore(max98090);
>>           break;
>>       default:
>>           return -EINVAL;
>> @@ -1950,6 +2136,7 @@ static int max98090_dai_hw_params(struct 
>> snd_pcm_substream *substream,
>>         cdata->rate = max98090->lrclk;
>>   +    max98090_shdn_save(max98090);
>>       /* Update filter mode */
>>       if (max98090->lrclk < 24000)
>>           snd_soc_component_update_bits(component, 
>> M98090_REG_FILTER_CONFIG,
>> @@ -1965,6 +2152,7 @@ static int max98090_dai_hw_params(struct 
>> snd_pcm_substream *substream,
>>       else
>>           snd_soc_component_update_bits(component, 
>> M98090_REG_FILTER_CONFIG,
>>               M98090_DHF_MASK, M98090_DHF_MASK);
>> +    max98090_shdn_restore(max98090);
>>         max98090_configure_dmic(max98090, max98090->dmic_freq, 
>> max98090->pclk,
>>                   max98090->lrclk);
>> @@ -1995,6 +2183,7 @@ static int max98090_dai_set_sysclk(struct 
>> snd_soc_dai *dai,
>>        *         0x02 (when master clk is 20MHz to 40MHz)..
>>        *         0x03 (when master clk is 40MHz to 60MHz)..
>>        */
>> +    max98090_shdn_save(max98090);
>>       if ((freq >= 10000000) && (freq <= 20000000)) {
>>           snd_soc_component_write(component, M98090_REG_SYSTEM_CLOCK,
>>               M98090_PSCLK_DIV1);
>> @@ -2009,8 +2198,10 @@ static int max98090_dai_set_sysclk(struct 
>> snd_soc_dai *dai,
>>           max98090->pclk = freq >> 2;
>>       } else {
>>           dev_err(component->dev, "Invalid master clock frequency\n");
>> +        max98090_shdn_restore(max98090);
>>           return -EINVAL;
>>       }
>> +    max98090_shdn_restore(max98090);
>>         max98090->sysclk = freq;
>>   @@ -2122,10 +2313,12 @@ static void max98090_pll_work(struct 
>> max98090_priv *max98090)
>>        */
>>         /* Toggle shutdown OFF then ON */
>> +    mutex_lock(&component->card->dapm_mutex);
>>       snd_soc_component_update_bits(component, 
>> M98090_REG_DEVICE_SHUTDOWN,
>>                   M98090_SHDNN_MASK, 0);
>>       snd_soc_component_update_bits(component, 
>> M98090_REG_DEVICE_SHUTDOWN,
>>                   M98090_SHDNN_MASK, M98090_SHDNN_MASK);
>> +    mutex_unlock(&component->card->dapm_mutex);
>>         for (i = 0; i < 10; ++i) {
>>           /* Give PLL time to lock */
>> @@ -2448,7 +2641,12 @@ static int max98090_probe(struct 
>> snd_soc_component *component)
>>        */
>>       snd_soc_component_read32(component, M98090_REG_DEVICE_STATUS);
>>   -    /* High Performance is default */
>> +    /*
>> +     * SHDN should be 0 at the point, no need to save/restore for the
>> +     * following registers.
>> +     *
>> +     * High Performance is default
>> +     */
>>       snd_soc_component_update_bits(component, M98090_REG_DAC_CONTROL,
>>           M98090_DACHP_MASK,
>>           1 << M98090_DACHP_SHIFT);
>> @@ -2459,7 +2657,12 @@ static int max98090_probe(struct 
>> snd_soc_component *component)
>>           M98090_ADCHP_MASK,
>>           1 << M98090_ADCHP_SHIFT);
>>   -    /* Turn on VCM bandgap reference */
>> +    /*
>> +     * SHDN should be 0 at the point, no need to save/restore for the
>> +     * following registers.
>> +     *
>> +     * Turn on VCM bandgap reference
>> +     */
>>       snd_soc_component_write(component, M98090_REG_BIAS_CONTROL,
>>           M98090_VCM_MODE_MASK);
>>   @@ -2491,25 +2694,9 @@ static void max98090_remove(struct 
>> snd_soc_component *component)
>>       max98090->component = NULL;
>>   }
>>   -static void max98090_seq_notifier(struct snd_soc_component 
>> *component,
>> -    enum snd_soc_dapm_type event, int subseq)
>> -{
>> -    struct max98090_priv *max98090 = 
>> snd_soc_component_get_drvdata(component);
>> -
>> -    if (max98090->shdn_pending) {
>> -        snd_soc_component_update_bits(component, 
>> M98090_REG_DEVICE_SHUTDOWN,
>> -                M98090_SHDNN_MASK, 0);
>> -        msleep(40);
>> -        snd_soc_component_update_bits(component, 
>> M98090_REG_DEVICE_SHUTDOWN,
>> -                M98090_SHDNN_MASK, M98090_SHDNN_MASK);
>> -        max98090->shdn_pending = false;
>> -    }
>> -}
>> -
>>   static const struct snd_soc_component_driver 
>> soc_component_dev_max98090 = {
>>       .probe            = max98090_probe,
>>       .remove            = max98090_remove,
>> -    .seq_notifier        = max98090_seq_notifier,
>>       .set_bias_level        = max98090_set_bias_level,
>>       .idle_bias_on        = 1,
>>       .use_pmdown_time    = 1,
>> diff --git a/sound/soc/codecs/max98090.h b/sound/soc/codecs/max98090.h
>> index a197114b0dad..0a31708b7df7 100644
>> --- a/sound/soc/codecs/max98090.h
>> +++ b/sound/soc/codecs/max98090.h
>> @@ -1539,7 +1539,8 @@ struct max98090_priv {
>>       unsigned int pa2en;
>>       unsigned int sidetone;
>>       bool master;
>> -    bool shdn_pending;
>> +    int saved_count;
>> +    int saved_shdn;
>>   };
>>     int max98090_mic_detect(struct snd_soc_component *component,
>
> Best regards

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland




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