linux-kernel - Re: [PATCH AUTOSEL 4.19 031/123] ASoC: Intel: Power down links before turning off display audio power

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Date:   Wed, 5 Dec 2018 07:34:18 -0800
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>, Sasha Levin <sashal@...nel.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sriram Periyasamy <sriramx.periyasamy@...el.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [PATCH AUTOSEL 4.19 031/123] ASoC: Intel: Power down links before
 turning off display audio power

On 12/5/18 3:48 AM, Mark Brown wrote:
> On Wed, Dec 05, 2018 at 04:34:23AM -0500, Sasha Levin wrote:
>> From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>>
>> [ Upstream commit 4c10473d6ddf12ec124c9ff71a5d23bb5388478b ]
>>
>> On certain platforms, Display HDMI HDA codec was not going to sleep state
>> after the use when links are powered down after turning off the display
>> power. As per the HW recommendation, links are powered down before turning
>> off the display power to ensure that the codec goes to sleep state.
> 
> Are we sure there's no dependencies here?

If you are referring to dependencies to other patches, not that I can 
think of. Based on timelines there isn't a strong link with 4.19: the 
patch was initially submitted in August (and missed), before v4.19 came 
out, and has also been used in 4.14 backports.