linux-kernel - Re: [PATCH] ALSA: hda: cs35l56: Enable low-power hibernation mode on SPI

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Message-ID: <1528da8b-4ca3-4f12-be17-a3222039fa20@opensource.cirrus.com>
Date:   Wed, 22 Nov 2023 11:04:27 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     <tiwai@...e.com>, <linux-sound@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>
Subject: Re: [PATCH] ALSA: hda: cs35l56: Enable low-power hibernation mode on
 SPI

On 21/11/23 20:36, Takashi Iwai wrote:
> On Tue, 21 Nov 2023 16:44:19 +0100,
> Richard Fitzgerald wrote:
>>
>> SPI hibernation is now supported with the latest hibernation/wake
>> sequences in the shared ASoC code.
>>
>> This has a functional dependency on two commits:
>>
>> commit 3df761bdbc8b ("ASoC: cs35l56: Wake transactions need to be issued
>> twice")
>>
>> commit a47cf4dac7dc ("ASoC: cs35l56: Change hibernate sequence to use
>> allow auto hibernate")
>>
>> To protect against this, enabling hibernation is conditional on
>> CS35L56_WAKE_HOLD_TIME_US being defined, which indicates that the new
>> hibernation sequences are available.
>>
>> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
> 
> Is this expected to be merged for 6.7?  Or it can be post 6.7?
> I guess the former, but just to make sure.
>

It would be good to get it into 6.7 because it reduces the power
consumption in runtime-suspend and suspend-to-RAM. But it's not
critical (it's not a bugfix).

> 
> thanks,
> 
> Takashi