[alsa-devel] [PATCH] ASoC: rt5670: Fix GPIO headset detection regression

[Takashi Iwai]

On Tue, 22 Aug 2017 10:33:22 +0200,
Andy Shevchenko wrote:
> 
> On Tue, 2017-08-22 at 07:44 +0200, Takashi Iwai wrote:
> > RT5670 codec driver and its machine driver for Intel CHT assume the
> > implicit GPIO mapping on the index 0 while BIOS on most devices don't
> > provide it.  The recent commit f10e4bf6632b ("gpio: acpi: Even more
> > tighten up ACPI GPIO lookups") restricts such cases and it resulted in
> > a regression where the headset jack setup fails like:
> > 
> >   rt5670 i2c-10EC5672:00: ASoC: Cannot get gpio at index 0: -2
> >   rt5670 i2c-10EC5672:00: Adding jack GPIO failed
> > 
> > For fixing this, we need to provide the GPIO mapping explicitly in the
> > machine driver.  Also this patch corrects the string to be passed to
> > gpiolib to match with the pre-given mapping, too.
> > 
> 
> > Fixes: f10e4bf6632b ("gpio: acpi: Even more tighten up ACPI GPIO
> > lookups")
> 
> I don't think it fixes that exact commit. with this mapping the driver
> will work pretty much well for previous versions of kernel (that do not
> have mentioned commit).
> 
> So, for my opinion it should have referred to the initial commit of that
> board file which brings GPIO request in the first place.

Yeah, it's a bit unclear which commit should be pointed as "fixes" in
such a case.  Clearly, the regression came by the mentioned commit, so
I picked it up for fixes-tag as the indicator to which kernel it
should be backported -- in the case when it slipped from 4.13 cycle.
We don't have to apply the fix for patches older than 4.12, it just
works.  The original GPIO code had some implicit assumption and it
worked somehow -- no matter whether it's the right thing or not.

So, while I'm fine to change the fixes tag to point another commit,
it becomes slightly apart from the "regression fix" that the commit
was intended for.

That said, this comes from the multiple usages of fixes tag: it can
point to a regression point that the patch fixes, and it can point to
the original commit the (potential) issue was introduced.


thanks,

Takashi

> After addressing that,
> Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> 
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=115531
> > Reported-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.co
> > m>
> > Tested-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> > Signed-off-by: Takashi Iwai <tiwai at suse.de>
> > ---
> >  sound/soc/codecs/rt5670.c               |  2 +-
> >  sound/soc/intel/boards/cht_bsw_rt5672.c | 10 ++++++++++
> >  2 files changed, 11 insertions(+), 1 deletion(-)
> > 
> > diff --git a/sound/soc/codecs/rt5670.c b/sound/soc/codecs/rt5670.c
> > index 0ec7985ed306..054b613cb0d0 100644
> > --- a/sound/soc/codecs/rt5670.c
> > +++ b/sound/soc/codecs/rt5670.c
> > @@ -567,7 +567,7 @@ int rt5670_set_jack_detect(struct snd_soc_codec
> > *codec,
> >  
> >  	rt5670->jack = jack;
> >  	rt5670->hp_gpio.gpiod_dev = codec->dev;
> > -	rt5670->hp_gpio.name = "headphone detect";
> > +	rt5670->hp_gpio.name = "headset";
> >  	rt5670->hp_gpio.report = SND_JACK_HEADSET |
> >  		SND_JACK_BTN_0 | SND_JACK_BTN_1 | SND_JACK_BTN_2;
> >  	rt5670->hp_gpio.debounce_time = 150;
> > diff --git a/sound/soc/intel/boards/cht_bsw_rt5672.c
> > b/sound/soc/intel/boards/cht_bsw_rt5672.c
> > index bc2a52de06a3..f597d5582223 100644
> > --- a/sound/soc/intel/boards/cht_bsw_rt5672.c
> > +++ b/sound/soc/intel/boards/cht_bsw_rt5672.c
> > @@ -184,6 +184,13 @@ static int cht_aif1_hw_params(struct
> > snd_pcm_substream *substream,
> >  	return 0;
> >  }
> >  
> > +static const struct acpi_gpio_params headset_gpios = { 0, 0, false };
> > +
> > +static const struct acpi_gpio_mapping cht_rt5672_gpios[] = {
> > +	{ "headset-gpios", &headset_gpios, 1 },
> > +	{},
> > +};
> > +
> >  static int cht_codec_init(struct snd_soc_pcm_runtime *runtime)
> >  {
> >  	int ret;
> > @@ -191,6 +198,9 @@ static int cht_codec_init(struct
> > snd_soc_pcm_runtime *runtime)
> >  	struct snd_soc_codec *codec = codec_dai->codec;
> >  	struct cht_mc_private *ctx =
> > snd_soc_card_get_drvdata(runtime->card);
> >  
> > +	if (devm_acpi_dev_add_driver_gpios(codec->dev,
> > cht_rt5672_gpios))
> > +		dev_warn(runtime->dev, "Unable to add GPIO mapping
> > table\n");
> > +
> >  	/* TDM 4 slots 24 bit, set Rx & Tx bitmask to 4 active slots
> > */
> >  	ret = snd_soc_dai_set_tdm_slot(codec_dai, 0xF, 0xF, 4, 24);
> >  	if (ret < 0) {
> 
> -- 
> Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> Intel Finland Oy
>