[alsa-devel] [PATCH 2/2] ASoC: Intel: bytcr_rt5640: Add quirks for ASUS MeMO Pad 7 (ME176C)

[Hans de Goede]

H,

On 22-12-18 15:59, Stephan Gerhold wrote:
> On Sat, Dec 22, 2018 at 03:47:12PM +0100, Stephan Gerhold wrote:
>> Add quirks to select the correct input map, jack-detect options
>> and channel map to make sound work on the ASUS MeMO Pad 7 (ME176C).
> 
> Everything seems to work fine with the quirks below, although I have to
> say that the internal microphone quality is really bad. There are
> always high-pitched sounds in the background. Not sure if the hardware
> is just really bad or if there is any way to improve it.
> (I never use it so I have not investigated much further..)

One possible way of improving it which is worthwhile testing
is adding the BYT_RT5640_DIFF_MIC quirk.

Note almost all quirk table entries not using a DMIC mapping have this
set (it is also set in INPUT_DEFAULTS) because it does not really hurt
to enable it, while likely only a few models really have a diff mic.

>> Note: Although sound works out of the box, jack detection currently
>> requires overriding the ACPI DSDT table. This is necessary because
>> the rt5640 ACPI device (10EC5640) has the wrong GPIO listed as
>> interrupt (one of the Bluetooth GPIOs).
>> The correct GPIO is GPO2 0x0004 (listed as the first GPIO in the
>> Intel(R) Audio Machine Driver - AMCR0F28 device).
> 
> At some point it might be possible to add a workaround for this using
> that AMCR0F28 device which has the correct GPIO. However, at the moment
> I still need the DSDT override for Bluetooth to work (with no simple
> workaround), so it's probably easiest if we just document it here for
> now. Eventually I will investigate this later..

+1 for just documenting, as long as this device needs a DSDT override
anyways I don't think it is a good idea to add code to the bytcr_rt5640.c
machine driver just to avoid that. If the machine driver is the only
one needing the DSDT override and some code can avoid it then the
balance changes, but for now I believe that just documenting it is
best.

Regards,

Hans





> 
>>
>> Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
>> ---
>>   sound/soc/intel/boards/bytcr_rt5640.c | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/sound/soc/intel/boards/bytcr_rt5640.c b/sound/soc/intel/boards/bytcr_rt5640.c
>> index a22366ce33c4..ca8b4d5ff70f 100644
>> --- a/sound/soc/intel/boards/bytcr_rt5640.c
>> +++ b/sound/soc/intel/boards/bytcr_rt5640.c
>> @@ -428,6 +428,18 @@ static const struct dmi_system_id byt_rt5640_quirk_table[] = {
>>   					BYT_RT5640_SSP0_AIF1 |
>>   					BYT_RT5640_MCLK_EN),
>>   	},
>> +	{
>> +		.matches = {
>> +			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
>> +			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "ME176C"),
>> +		},
>> +		.driver_data = (void *)(BYT_RT5640_IN1_MAP |
>> +					BYT_RT5640_JD_SRC_JD2_IN4N |
>> +					BYT_RT5640_OVCD_TH_2000UA |
>> +					BYT_RT5640_OVCD_SF_0P75 |
>> +					BYT_RT5640_SSP0_AIF1 |
>> +					BYT_RT5640_MCLK_EN),
>> +	},
>>   	{
>>   		.matches = {
>>   			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
>> -- 
>> 2.20.1
>>