linux-kernel - Re: [PATCH v1 0/8] System Suspend fixes and improvements for CS35L41 HDA

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Date:   Thu, 26 Oct 2023 18:02:21 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Stefan Binding <sbinding@...nsource.cirrus.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        "Mark Brown" <broonie@...nel.org>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <linux-sound@...r.kernel.org>,
        <patches@...nsource.cirrus.com>
Subject: Re: [PATCH v1 0/8] System Suspend fixes and improvements for CS35L41 HDA

On Thu, 26 Oct 2023 17:05:50 +0200,
Stefan Binding wrote:
> 
> There is a report of a single laptop which uses CS35L41 HDA having an
> issue with System Suspend. This particular laptop uses S3 (Deep) Sleep.
> The reported issue states that when the laptop resumes from a system
> suspend, audio no longer works.
> 
> The root cause of this issue is due to the CS35L41 being returned to us
> in an unexpected state after a suspend/resume cycle.
> When the driver resumes, it expects the parts to have been reset, which
> leads to issues with audio and firmware loading.
> 
> To prevent this issue, and the possibility of similar issues, patches
> 2-5 force the driver to reset during probe, system suspend, and system
> resume, which ensures that the part is always in the correct state.
> Patches 6-8 are improvements in the suspend and firmware loading code,
> which makes it easier to detect issues in the future, as well as
> simplifiying the suspend code.
> 
> Patch 1 is a fix for an incorrect configuration for the HP Zbook Fury
> 17, which is the laptop which had the original issue.
> 
> Stefan Binding (8):
>   ALSA: hda: cs35l41: Use reset label to get GPIO for HP Zbook Fury 17
>     G9
>   ALSA: hda: cs35l41: Assert reset before system suspend
>   ALSA: hda: cs35l41: Assert Reset prior to de-asserting in probe and
>     system resume
>   ALSA: hda: cs35l41: Run boot process during resume callbacks
>   ALSA: hda: cs35l41: Force a software reset after hardware reset
>   ALSA: hda: cs35l41: Do not unload firmware before reset in system
>     suspend
>   ALSA: hda: cs35l41: Check CSPL state after loading firmware
>   ASoC: cs35l41: Detect CSPL errors when sending CSPL commands

Applied to for-next branch now.  Thanks.


Takashi