linux-kernel - Re: [PATCH] ALSA: hda/realtek: Serialize setting GPIO LED

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Date:   Wed, 01 Jul 2020 08:46:26 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     tiwai@...e.com, anthony.won@...onical.com,
        Jaroslav Kysela <perex@...ex.cz>,
        Libin Yang <libin.yang@...el.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Kailang Yang <kailang@...ltek.com>,
        Hui Wang <hui.wang@...onical.com>,
        Jian-Hong Pan <jian-hong@...lessm.com>,
        Tomas Espeleta <tomas.espeleta@...il.com>,
        Thomas Hebb <tommyhebb@...il.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        alsa-devel@...a-project.org (moderated list:SOUND),
        linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH] ALSA: hda/realtek: Serialize setting GPIO LED

On Wed, 01 Jul 2020 07:21:35 +0200,
Kai-Heng Feng wrote:
> 
> If a system has two GPIO controlled LED, one for mute and another one
> for micmute, and both of them are on before system suspend, sometimes
> one of them won't be turned off by system suspend.
> 
> The codec doesn't seem to be able to control multiple GPIO LEDs at the
> same time, so introduce a new mutex to serialize setting the LED, to
> prevent the issue from happening.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  include/sound/hda_codec.h     | 1 +
>  sound/pci/hda/hda_codec.c     | 1 +
>  sound/pci/hda/patch_realtek.c | 3 +++
>  3 files changed, 5 insertions(+)
> 
> diff --git a/include/sound/hda_codec.h b/include/sound/hda_codec.h
> index d16a4229209b..3a1792bbb7ac 100644
> --- a/include/sound/hda_codec.h
> +++ b/include/sound/hda_codec.h
> @@ -206,6 +206,7 @@ struct hda_codec {
>  
>  	struct mutex spdif_mutex;
>  	struct mutex control_mutex;
> +	struct mutex led_mutex;

Since it's only for Realtek codec, can it be better in alc_spec
instead?


thanks,

Takashi