[Intel-gfx] [PATCH 2/2] drm/i915/display: Do not re-enable PSR after it was marked as not reliable

[Souza, Jose]

On Wed, 2022-03-09 at 13:51 +0000, Hogander, Jouni wrote:
> Hello Jose,
> 
> See my question/comment below.
> 
> On Tue, 2022-03-08 at 07:41 -0800, José Roberto de Souza wrote:
> > If a error happens and sink_not_reliable is set, PSR should be
> > disabled
> > for good but that is not happening.
> > It would be disabled by the function handling the PSR error but then
> > on the next fastset it would be enabled again in
> > _intel_psr_post_plane_update().
> > It would only be disabled for good in the next modeset where has_psr
> > will be set false.
> 
> How about invalidate/flush? If you get error between
> intel_psr_invalidate and intel_psr_flush psr is activated
> even sink_not_reliable is true?

enabled != activated.

flush and invalidate functions checks if PSR is enabled, if not it returns and do a thing.

> 
> > 
> > Fixes: 9ce5884e5139 ("drm/i915/display: Only keep PSR enabled if
> > there is active planes")
> > Reported-by: Khaled Almahallawy <khaled.almahallawy at intel.com>
> > Reported-by: Charlton Lin <charlton.lin at intel.com>
> > Cc: Jouni Högander <jouni.hogander at intel.com>
> > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_psr.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> > b/drivers/gpu/drm/i915/display/intel_psr.c
> > index bbd581ed08159..cd05e5fdc8ca9 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -1853,6 +1853,9 @@ static void _intel_psr_post_plane_update(const
> > struct intel_atomic_state *state,
> > 
> >               mutex_lock(&psr->lock);
> > 
> > +             if (psr->sink_not_reliable)
> > +                     continue;
> > +
> >               drm_WARN_ON(&dev_priv->drm, psr->enabled &&
> > !crtc_state->active_planes);
> > 
> >               /* Only enable if there is active planes */
> 
> BR,
> 
> Jouni Högander