Re: drm: amdgpu: s0ix suspend stopped working #forregzbot

[Thorsten Leemhuis <regressions@leemhuis.info>]

Hi, this is your Linux kernel regression tracker speaking.

For the record:

#regzbot fixed-by: e8521d0cd984897

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=master&id=e8521d0cd984897b4fa58e7837afebd04e44f0b3

> drm/amd/display: Revert W/A for hard hangs on DCN20/DCN21
> The WA from commit 2a50edbf10c8 ("drm/amd/display: Apply w/a for hard hang
> on HPD") and commit 1bd3bc745e7f ("drm/amd/display: Extend w/a for hard
> hang on HPD to dcn20") causes a regression in s0ix where the system will
> fail to resume properly on many laptops.  Pull the workarounds out to
> avoid that s0ix regression in the common case.  This HPD hang happens with
> an external device in special circumstances and a new W/A will need to be
> developed for this in the future.
> 
> Cc: Qingqing Zhuo <qingqing.zhuo@amd.com>
> Reported-by: Scott Bruce <smbruce@gmail.com>
> Reported-by: Chris Hixon <linux-kernel-bugs@hixontech.com>
> Reported-by: spasswolf@web.de
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=215436
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1821
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1852
> Fixes: 2a50edbf10c8 ("drm/amd/display: Apply w/a for hard hang on HPD")
> Fixes: 1bd3bc745e7f ("drm/amd/display: Extend w/a for hard hang on HPD to dcn20")
> Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>


TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.

On 01.01.22 11:22, Thorsten Leemhuis wrote:
> Hi, this is your Linux kernel regression tracker speaking.
> 
> There are two reports about s2idle regression on AMD systems. They are
> already being worked on.
> 
> I'm writing this mail just for getting it tracked by regzbot and to make
> it easier for people to find the issue.
> 
> #regzbot ^introduced 2a50edbf10c8c56e930bfb53d8f9f00a33fd837e
> #regzbot title drm: amdgpu: s0ix suspend stopped working
> #regzbot Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1821
> #regzbot Link: https://bugzilla.kernel.org/show_bug.cgi?id=215436
> 
> Ciao, Thorsten
> 
> P.S.: As a Linux kernel regression tracker I'm getting a lot of reports
> on my table. I can only look briefly into most of them. Unfortunately
> therefore I sometimes will get things wrong or miss something important.
> I hope that's not the case here; if you think it is, don't hesitate to
> tell me about it in a public reply, that's in everyone's interest.
> 
> BTW, I have no personal interest in this issue, which is tracked using
> regzbot, my Linux kernel regression tracking bot
> (https://linux-regtracking.leemhuis.info/regzbot/). I'm only posting
> this mail to get things rolling again and hence don't need to be CC on
> all further activities wrt to this regression.
> 
> ---
> Additional information about regzbot:
> 
> If you want to know more about regzbot, check out its web-interface, the
> getting start guide, and/or the references documentation:
> 
> https://linux-regtracking.leemhuis.info/regzbot/
> https://gitlab.com/knurd42/regzbot/-/blob/main/docs/getting_started.md
> https://gitlab.com/knurd42/regzbot/-/blob/main/docs/reference.md
> 
> The last two documents will explain how you can interact with regzbot
> yourself if your want to.
> 
> Hint for reporters: when reporting a regression it's in your interest to
> tell #regzbot about it in the report, as that will ensure the regression
> gets on the radar of regzbot and the regression tracker. That's in your
> interest, as they will make sure the report won't fall through the
> cracks unnoticed.
> 
> Hint for developers: you normally don't need to care about regzbot once
> it's involved. Fix the issue as you normally would, just remember to
> include a 'Link:' tag to the report in the commit message, as explained
> in Documentation/process/submitting-patches.rst
> That aspect was recently was made more explicit in commit 1f57bd42b77c:
> https://git.kernel.org/linus/1f57bd42b77c
> 
> 
> 
>