[Intel-gfx] [PATCH 3/3] drm/i915: Mark FBC B gone if pipe B is gone

[Ville Syrjälä]

On Thu, Sep 22, 2022 at 11:18:55AM +0300, Luca Coelho wrote:
> On Fri, 2022-09-16 at 19:52 +0300, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > 
> > If pipe B is fused off we also shouldn't have FBC B.
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_device_info.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
> > index 1434dc33cf49..fbefebc023f1 100644
> > --- a/drivers/gpu/drm/i915/intel_device_info.c
> > +++ b/drivers/gpu/drm/i915/intel_device_info.c
> > @@ -394,6 +394,7 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
> >  		if (dfsm & SKL_DFSM_PIPE_B_DISABLE) {
> >  			runtime->pipe_mask &= ~BIT(PIPE_B);
> >  			runtime->cpu_transcoder_mask &= ~BIT(TRANSCODER_B);
> > +			runtime->fbc_mask &= ~BIT(INTEL_FBC_B);
> >  		}
> >  		if (dfsm & SKL_DFSM_PIPE_C_DISABLE) {
> >  			runtime->pipe_mask &= ~BIT(PIPE_C);
> 
> I don't know (yet) what exactly this does, but it makes sense if you
> think of consistency: we already do that for PIPE_A.

It's basically saying the entire pipe is fused off, so anything
living inside that pipe should also be fused off.

> 
> But what about PIPE_C and PIPE_D? Wouldn't it make sense to do the same
> thing for them as well?

There is no FBC engine on those pipes (we don't even have
the INTEL_FBC_C+ enum values defined), at least for now.

-- 
Ville Syrjälä
Intel