[Intel-gfx] [PATCH v5 5/6] drm/i915/psr: Check that vblank is long enough for psr2

[Hogander, Jouni]

On Tue, 2023-03-28 at 14:24 +0300, Ville Syrjälä wrote:
> On Wed, Mar 22, 2023 at 12:34:11PM +0200, Jouni Högander wrote:
> > Ensure vblank >= psr2 vblank
> > where
> > Psr2 vblank = PSR2_CTL Block Count Number maximum line count.
> > 
> > Bspec: 71580, 49274
> > 
> > v2: Use calculated block count number maximum line count
> > 
> > Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
> 
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> We seem to be also missing the "PSR2 line time" check?

That is taken care in intel_psr.c:_compute_psr2_wake_times.

> 
> > ---
> >  drivers/gpu/drm/i915/display/intel_psr.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> > b/drivers/gpu/drm/i915/display/intel_psr.c
> > index 4b7c946a9a25..b53c71c06105 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -968,6 +968,15 @@ static bool intel_psr2_config_valid(struct
> > intel_dp *intel_dp,
> >                 return false;
> >         }
> >  
> > +       /* Vblank >= PSR2_CTL Block Count Number maximum line count
> > */
> > +       if (crtc_state->hw.adjusted_mode.crtc_vblank_end -
> > +           crtc_state->hw.adjusted_mode.crtc_vblank_start <
> > +           psr2_block_count_lines(intel_dp)) {
> > +               drm_dbg_kms(&dev_priv->drm,
> > +                           "PSR2 not enabled, too short vblank
> > time\n");
> > +               return false;
> > +       }
> > +
> >         if (HAS_PSR2_SEL_FETCH(dev_priv)) {
> >                 if (!intel_psr2_sel_fetch_config_valid(intel_dp,
> > crtc_state) &&
> >                     !HAS_PSR_HW_TRACKING(dev_priv)) {
> > -- 
> > 2.34.1
>