Re: [PATCH v7 07/19] drm/i915/dp: Do not enable PSR2 if DSC is enabled

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

On Fri, Nov 02, 2018 at 07:51:18PM +0200, Ville Syrjälä wrote:
> On Thu, Nov 01, 2018 at 11:46:47PM -0700, Manasi Navare wrote:
> > If a eDP panel supports both PSR2 and VDSC, our HW cannot
> > support both at a time. Give priority to PSR2 if a requested
> > resolution can be supported without compression else enable
> > VDSC and keep PSR2 disabled.
> > 
> > v3:
> > * Rebase
> > v2:
> > * Add warning for DSC and PSR2 enabled together (DK)
> > 
> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > Cc: Jani Nikula <jani.nikula@intel.com>
> > Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_psr.c | 16 +++++++++++++---
> >  1 file changed, 13 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> > index bc2d88313ed0..8f063e1e2fb2 100644
> > --- a/drivers/gpu/drm/i915/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > @@ -71,9 +71,9 @@ static bool psr_global_enabled(u32 debug)
> >  static bool intel_psr2_enabled(struct drm_i915_private *dev_priv,
> >  			       const struct intel_crtc_state *crtc_state)
> >  {
> > -	/* Disable PSR2 by default for all platforms */
> > -	if (i915_modparams.enable_psr == -1)
> > -		return false;
> 
> That seems unrelated to DSC?

Thats a good catch, i think thsi got removed due to a rebase by mistake.
I will add it back there.

Manasi

> 
> > +	/* Cannot enable DSC and PSR2 simultaneously */
> > +	WARN_ON(crtc_state->dsc_params.compression_enable &&
> > +		crtc_state->has_psr2);
> >  
> >  	switch (dev_priv->psr.debug & I915_PSR_DEBUG_MODE_MASK) {
> >  	case I915_PSR_DEBUG_FORCE_PSR1:
> > @@ -463,6 +463,16 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> >  	if (!dev_priv->psr.sink_psr2_support)
> >  		return false;
> >  
> > +	/*
> > +	 * DSC and PSR2 cannot be enabled simultaneously. If a requested
> > +	 * resolution requires DSC to be enabled, priority is given to DSC
> > +	 * over PSR2.
> > +	 */
> > +	if (crtc_state->dsc_params.compression_enable) {
> > +		DRM_DEBUG_KMS("PSR2 cannot be enabled since DSC is enabled\n");
> > +		return false;
> > +	}
> > +
> >  	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
> >  		psr_max_h = 4096;
> >  		psr_max_v = 2304;
> > -- 
> > 2.18.0
> 
> -- 
> Ville Syrjälä
> Intel
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