Re: [PATCH 07/19] drm/i915/display: Use joined pipes in intel_dp_joiner_needs_dsc

["Nautiyal, Ankit K" <ankit.k.nautiyal@xxxxxxxxx>]

On 9/12/2024 1:47 AM, Ville Syrjälä wrote:
> On Wed, Sep 11, 2024 at 06:43:37PM +0530, Ankit Nautiyal wrote:
> > In preparation of ultrajoiner, use number of joined pipes in the
> > intel_dp_joiner_needs_dsc helper, instead of joiner flag.
> >
> > Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
> > ---
> >   drivers/gpu/drm/i915/display/intel_dp.c     | 9 +++++----
> >   drivers/gpu/drm/i915/display/intel_dp.h     | 3 ++-
> >   drivers/gpu/drm/i915/display/intel_dp_mst.c | 5 +++--
> >   3 files changed, 10 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 65044f63d1f5..6c503b5968d2 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -1412,7 +1412,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
> >   		dsc = dsc_max_compressed_bpp && dsc_slice_count;
> >   	}
> >   
> > -	if (intel_dp_joiner_needs_dsc(dev_priv, joiner) && !dsc)
> > +	if (intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes) && !dsc)
> >   		return MODE_CLOCK_HIGH;
> >   
> >   	if (mode_rate > max_rate && !dsc)
> > @@ -2520,14 +2520,15 @@ int intel_dp_config_required_rate(const struct intel_crtc_state *crtc_state)
> >   	return intel_dp_link_required(adjusted_mode->crtc_clock, bpp);
> >   }
> >   
> > -bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915, bool use_joiner)
> > +bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915,
> > +			       int num_joined_pipes)
> >   {
> >   	/*
> >   	 * Pipe joiner needs compression up to display 12 due to bandwidth
> >   	 * limitation. DG2 onwards pipe joiner can be enabled without
> >   	 * compression.
> >   	 */
> > -	return DISPLAY_VER(i915) < 13 && use_joiner;
> > +	return DISPLAY_VER(i915) < 13 && (num_joined_pipes == 2);
> Pointless parens.

Noted. Will remove these.

Besides this, I am wondering if I should change the variable 
num_joined_pipes to num_pipes or num_pipes_used? So its values 1, 2, 4 
make more sense?


Regards,

Ankit

> >   }
> >   
> >   static int
> > @@ -2558,7 +2559,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> >   	if (num_joined_pipes == 2)
> >   		pipe_config->joiner_pipes = GENMASK(crtc->pipe + 1, crtc->pipe);
> >   
> > -	joiner_needs_dsc = intel_dp_joiner_needs_dsc(i915, pipe_config->joiner_pipes);
> > +	joiner_needs_dsc = intel_dp_joiner_needs_dsc(i915, num_joined_pipes);
> >   
> >   	dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
> >   		     !intel_dp_compute_config_limits(intel_dp, pipe_config,
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
> > index bc9a82d82df2..cc08a309eb78 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.h
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> > @@ -123,7 +123,8 @@ int intel_dp_effective_data_rate(int pixel_clock, int bpp_x16,
> >   				 int bw_overhead);
> >   int intel_dp_max_link_data_rate(struct intel_dp *intel_dp,
> >   				int max_dprx_rate, int max_dprx_lanes);
> > -bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915, bool use_joiner);
> > +bool intel_dp_joiner_needs_dsc(struct drm_i915_private *i915,
> > +			       int num_joined_pipes);
> >   bool intel_dp_has_joiner(struct intel_dp *intel_dp);
> >   bool intel_dp_needs_vsc_sdp(const struct intel_crtc_state *crtc_state,
> >   			    const struct drm_connector_state *conn_state);
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > index 383b3e38df52..fb067749f3a0 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > @@ -588,7 +588,7 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
> >   	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> >   	pipe_config->has_pch_encoder = false;
> >   
> > -	joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, pipe_config->joiner_pipes);
> > +	joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes);
> >   
> >   	dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
> >   		     !intel_dp_mst_compute_config_limits(intel_dp,
> > @@ -1472,6 +1472,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
> >   							 mode->hdisplay, target_clock);
> >   	if (num_joined_pipes == 2) {
> >   		joiner = true;
> > +		num_joined_pipes = 2;
> >   		max_dotclk *= 2;
> >   	}
> >   
> > @@ -1512,7 +1513,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
> >   		dsc = dsc_max_compressed_bpp && dsc_slice_count;
> >   	}
> >   
> > -	if (intel_dp_joiner_needs_dsc(dev_priv, joiner) && !dsc) {
> > +	if (intel_dp_joiner_needs_dsc(dev_priv, num_joined_pipes) && !dsc) {
> >   		*status = MODE_CLOCK_HIGH;
> >   		return 0;
> >   	}
> > --
> > 2.45.2