[alsa-devel] [PATCH v2] ALSA: hda - restore the gpio led after resume

[Takashi Iwai]

At Tue, 19 Aug 2014 12:07:03 +0800,
Hui Wang wrote:
> 
> On some HP laptops, the mute led is controlled by codec gpio.
> 
> When some machine resume from s3/s4, the codec gpio data will be
> cleared to 0 by BIOS:
> Before suspend:
>   IO[3]: enable=1, dir=1, wake=0, sticky=0, data=1, unsol=0
> After resume:
>   IO[3]: enable=1, dir=1, wake=0, sticky=0, data=0, unsol=0
> 
> To skip the AFG node to enter D3 can't fix this problem.
> 
> A workaround is to restore the gpio data when the system resume
> back from s3/s4. It is safe even on the machines without this
> problem.
> 
> BugLink: https://bugs.launchpad.net/bugs/1358116
> Tested-by: Franz Hsieh <franz.hsieh at canonical.com>
> Cc: stable at vger.kernel.org
> Signed-off-by: Hui Wang <hui.wang at canonical.com>
> ---
> V2: move the verb write from led_power_filter to alc269_resume

Applied, thanks.


Takashi


> 
>  sound/pci/hda/patch_realtek.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index b32ce08..d71270a 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -3268,6 +3268,15 @@ static int alc269_resume(struct hda_codec *codec)
>  	snd_hda_codec_resume_cache(codec);
>  	alc_inv_dmic_sync(codec, true);
>  	hda_call_check_power_status(codec, 0x01);
> +
> +	/* on some machine, the BIOS will clear the codec gpio data when enter
> +	 * suspend, and won't restore the data after resume, so we restore it
> +	 * in the driver.
> +	 */
> +	if (spec->gpio_led)
> +		snd_hda_codec_write(codec, codec->afg, 0, AC_VERB_SET_GPIO_DATA,
> +			    spec->gpio_led);
> +
>  	if (spec->has_alc5505_dsp)
>  		alc5505_dsp_resume(codec);
>  
> -- 
> 1.9.1
>