On Thu, Aug 20, 2015 at 05:55:41PM -0700, Rodrigo Vivi wrote:
> At the beginning it was masked to allow PSR at all.
> Than it got removed later by my
> commit 09108b90f040 ("drm/i915: PSR: Remove Low Power HW tracking mask.")
> in order to trying fixing one case reported at intel-gfx mailing list
> where we were missing screen updates when runtime_pm was enabled.
>
> However I verified that other patch that makes flush to force
> invalidate also fixes this issue by itself.
> commit 169de1316c1e ("drm/i915: PSR: Flush means invalidate + flush")
>
> Mainly now that we are relying more on frontbuffer tracking it is a
> good idea to mask this hw tracking again.
>
> But besides all this above it is important to hightligh that with LPSP
> unmasked we started seeing some screen freezings as reported at fd.o.
>
> This patch fixes the unrecoverable frozen screens reported:
>
> Reference: https://bugs.freedesktop.org/show_bug.cgi?id=91436
> Reference: https://bugs.freedesktop.org/show_bug.cgi?id=91437
>
> Cc: Ivan Mitev <ivan.mitev@xxxxxxxxx>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
FWIW:
Tested-by: Brian Norris <briannorris@xxxxxxxxxxxx>
After patching up another regression locally, I bisected down to commit
09108b90f040 ("drm/i915: PSR: Remove Low Power HW tracking mask.") when
searching for why I could rarely get into PSR. I guess that's intended
behavior from the commit message?
WARNING: With this patch if snd_intel_hda driver is
running and not releasing power well properly PSR will
constant Exit and Performance Counter will be 0.
Anyway, I guess I'm saying I'm interested in whether there is a sane
path to getting PSR going again (without disabling sound!).
Regards,
Brian
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