Re: [PATCH 10/14] drm/i915: Populate possible_crtcs correctly

Dhinakaran Pandiyan
2018-06-25T18:37:27Z

On Mon, 2018-06-25 at 14:10 +0300, Ville Syrjälä wrote:
> On Thu, Jun 21, 2018 at 06:26:04PM -0700, Dhinakaran Pandiyan wrote:
> >
> > On Fri, 2018-06-15 at 19:49 +0300, Ville Syrjala wrote:
> > >
> > > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > >
> > > Don't advertize non-exisiting crtcs in the encoder possible_crtcs
> > > bitmask.
> > >
> > How do we end up advertising non-existing CRTCs? encoder->crtc_mask
> > seems to be populated in the encoder init functions based on
> > possible
> > pipes. Do you mean pipe and crtc->index can potentially differ?
> No. Just that we may sometimes set BIT(PIPE_C) in crtc_mask when
> there are only two pipes on the device.
>
Got it, thanks.
Since crtc_mask seems to be initialized based on the platform, we
should probably warn if we find out a bit is set incorrectly.

With or without that, this patch is
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

> >
> >
> >
> > >
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/intel_display.c | 17 ++++++++++++++++-
> > >  1 file changed, 16 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c
> > > b/drivers/gpu/drm/i915/intel_display.c
> > > index b095899d68a9..3fa9da714403 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -13959,6 +13959,20 @@ static int intel_encoder_clones(struct
> > > intel_encoder *encoder)
> > >   return index_mask;
> > >  }
> > >
> > > +static int intel_encoder_crtcs(struct intel_encoder *encoder)
> > > +{
> > > + struct drm_device *dev = encoder->base.dev;
> > > + struct intel_crtc *crtc;
> > > + int index_mask = 0;
> > > +
> > > + for_each_intel_crtc(dev, crtc) {
> > > + if (encoder->crtc_mask & BIT(crtc->pipe))
> > > + index_mask |= drm_crtc_mask(&crtc-
> > > >base);
> > > + }
> > > +
> > > + return index_mask;
> > > +}
> > > +
> > >  static bool has_edp_a(struct drm_i915_private *dev_priv)
> > >  {
> > >   if (!IS_MOBILE(dev_priv))
> > > @@ -14211,7 +14225,8 @@ static void intel_setup_outputs(struct
> > > drm_i915_private *dev_priv)
> > >   intel_psr_init(dev_priv);
> > >
> > >   for_each_intel_encoder(&dev_priv->drm, encoder) {
> > > - encoder->base.possible_crtcs = encoder-
> > > >crtc_mask;
> > > + encoder->base.possible_crtcs =
> > > + intel_encoder_crtcs(encoder);
> > >   encoder->base.possible_clones =
> > >   intel_encoder_clones(encoder);
> > >   }