Re: [PATCH v2 08/25] drm/i915/tgl: use TRANSCODER_EDP_VDSC on transcoder A

[Manasi Navare <manasi.d.navare@intel.com>]

On Tue, Jul 09, 2019 at 01:07:17AM +0000, Souza, Jose wrote:
> On Mon, 2019-07-08 at 16:16 -0700, Lucas De Marchi wrote:
> > From: José Roberto de Souza <jose.souza@intel.com>
> > 
> > On TGL the special EDP transcoder is gone and it should be handled by
> > transcoder A.
> > 
> > v2 (Lucas):
> >   - Reuse POWER_DOMAIN_TRANSCODER_EDP_VDSC (suggested by Ville)
> >   - Use crtc->dev since new_crtc_state->state may be NULL on atomic
> >     commit (suggested by Maarten)
> 
> As we are reusing would be nice also rename it to something like:
> POWER_DOMAIN_TRANSCODER_VDSC_PW2
> POWER_DOMAIN_LOW_POWER_TRANSCODER_VDSC /
> POWER_DOMAIN_LP_TRANSCODER_VDSC

We did struggle initially as well to find an appropriate name and settled for
POWER_DOMAIN_TRANSCODER_EDP_VDSC but I agree that now since it is not just for EDP
but for Transcoder A which could be any connector, its better to rename the power well

POWER_DOMAIN_TRANSCODER_VDSC_PW2 or 
POWER_DOMAIN_TRANSCODER_EDP_A_VDSC and then in the comment clearly mention that
for Gen 11 it is for Transcoder EDP VDSC and then Gen 12 + it is for Transcoder A VDSC

Manasi

> 
> > 
> > Cc: Imre Deak <imre.deak@intel.com>
> > Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
> > Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_vdsc.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c
> > b/drivers/gpu/drm/i915/display/intel_vdsc.c
> > index ffec807b8960..c27912f552f0 100644
> > --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> > +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> > @@ -459,16 +459,19 @@ int intel_dp_compute_dsc_params(struct intel_dp
> > *intel_dp,
> >  enum intel_display_power_domain
> >  intel_dsc_power_domain(const struct intel_crtc_state *crtc_state)
> >  {
> > +	struct drm_i915_private *i915 = to_i915(crtc_state->base.crtc-
> > >dev);
> >  	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> >  
> >  	/*
> > -	 * On ICL VDSC/joining for eDP transcoder uses a separate power
> > well PW2
> > -	 * This requires POWER_DOMAIN_TRANSCODER_EDP_VDSC power domain.
> > +	 * On ICL+ VDSC/joining for eDP/A transcoder uses a separate
> > power well
> > +	 * PW2. This requires POWER_DOMAIN_TRANSCODER_EDP_VDSC power
> > domain.
> >  	 * For any other transcoder, VDSC/joining uses the power well
> > associated
> >  	 * with the pipe/transcoder in use. Hence another reference on
> > the
> >  	 * transcoder power domain will suffice.
> >  	 */
> > -	if (cpu_transcoder == TRANSCODER_EDP)
> > +	if (INTEL_GEN(i915) >= 12 && cpu_transcoder == TRANSCODER_A)
> > +		return POWER_DOMAIN_TRANSCODER_EDP_VDSC;
> > +	else if (cpu_transcoder == TRANSCODER_EDP)
> >  		return POWER_DOMAIN_TRANSCODER_EDP_VDSC;
> >  	else
> >  		return POWER_DOMAIN_TRANSCODER(cpu_transcoder);
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