linux-kernel - Re: [PATCH v2 00/11] Fix support for System Suspend for CS35L41 HDA

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Date:   Mon, 24 Jul 2023 11:00:38 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Stefan Binding <sbinding@...nsource.cirrus.com>
Cc:     Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>
Subject: Re: [PATCH v2 00/11] Fix support for System Suspend for CS35L41 HDA

On Fri, 21 Jul 2023 17:18:05 +0200,
Stefan Binding wrote:
> 
> There have been a couple of customer reports of intermittant issues after
> system resume, where sometimes the DSP firmware stops responding.
> Investigations into this issue show that there is a race between receiving
> a prepare from the HDA core, and the firmware reload which is started by
> the system resume. This can causes the Global Enable on the CS35L41 to be
> enabled during the firmware load, which can sometimes cause issues in the
> DSP.
> 
> The existing system resume behaviour also did not resume the audio, if
> audio was previously playing when it was suspended.
> In addition, during investigation, it was found there were additional
> problems in the System Resume sequence, as well as the Playback sequence
> with External Boost, where the driver does not correctly follow its
> enable sequence for this mode. This can cause additional issues such as
> pops and clicks.
> 
> This chain intends to correct the sequences for playback and system
> suspend/resume so that the driver: obeys the external boost enable sequence;
> resumes audio on system resume; and avoids the race condition on firmware
> load and playback during system resume.
> 
> Changes since v1:
> - Split patch 1 into 2 separate patches
> - Combine Patches 6 and 9
> 
> Stefan Binding (11):
>   ALSA: cs35l41: Use mbox command to enable speaker output for external
>     boost
>   ALSA: cs35l41: Poll for Power Up/Down rather than waiting a fixed
>     delay
>   ALSA: hda: cs35l41: Check mailbox status of pause command after
>     firmware load
>   ALSA: hda: cs35l41: Ensure we correctly re-sync regmap before system
>     suspending.
>   ALSA: hda: cs35l41: Ensure we pass up any errors during system
>     suspend.
>   ALSA: hda: cs35l41: Move Play and Pause into separate functions
>   ALSA: hda: hda_component: Add pre and post playback hooks to
>     hda_component
>   ALSA: hda: cs35l41: Use pre and post playback hooks
>   ALSA: hda: cs35l41: Rework System Suspend to ensure correct call
>     separation
>   ALSA: hda: cs35l41: Add device_link between HDA and cs35l41_hda
>   ALSA: hda: cs35l41: Ensure amp is only unmuted during playback

Applied all patches now to for-next branch.


thanks,

Takashi