Re: [PATCH 3/3] drm/i915: Fix bigjoiner case for DP2.0

["Lisovskiy, Stanislav" <stanislav.lisovskiy@intel.com>]

On Mon, Feb 26, 2024 at 09:56:10PM +0200, Jani Nikula wrote:
> On Wed, 21 Feb 2024, Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> wrote:
> > Patch calculates bigjoiner pipes in mst compute.
> > Patch also passes bigjoiner bool to validate plane
> > max size.
> 
> Please use the imperative mood in commit messages, e.g. "calculate"
> intead of "calculates".
> 
> Please do not refer to "patch". We know it's a patch, until it isn't,
> and then it's a commit.
> 
> Please explain *why* the changes are being done, not just *what* is
> being done.
> 
> In the subject, what is "bigjoiner case for DP2.0"? DP 2.0 is a spec
> version, and as such irrelevant for the changes being done.
> 
> > Signed-off-by: vsrini4 <vidya.srinivas@intel.com>
> 
> ?

Hi Jani, I just added that patch from Vidya to my series, to be honest,
didn't have time at all to look much into it.
Looks like its me who is going to fix that.

> 
> > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_dp_mst.c | 19 ++++++++++++-------
> >  1 file changed, 12 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > index 5307ddd4edcf5..fd27d9976c050 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > @@ -523,6 +523,7 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
> >  				       struct drm_connector_state *conn_state)
> >  {
> >  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> > +	struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
> >  	struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
> >  	struct intel_dp *intel_dp = &intel_mst->primary->dp;
> >  	const struct intel_connector *connector =
> > @@ -540,6 +541,10 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
> >  	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> >  		return -EINVAL;
> >  
> > +	if (intel_dp_need_bigjoiner(intel_dp, adjusted_mode->crtc_hdisplay,
> > +				    adjusted_mode->crtc_clock))
> > +		pipe_config->bigjoiner_pipes = GENMASK(crtc->pipe + 1, crtc->pipe);
> > +
> >  	pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
> >  	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> >  	pipe_config->has_pch_encoder = false;
> > @@ -1318,12 +1323,6 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
> >  	 *   corresponding link capabilities of the sink) in case the
> >  	 *   stream is uncompressed for it by the last branch device.
> >  	 */
> > -	if (mode_rate > max_rate || mode->clock > max_dotclk ||
> > -	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
> > -		*status = MODE_CLOCK_HIGH;
> > -		return 0;
> > -	}
> > -
> >  	if (mode->clock < 10000) {
> >  		*status = MODE_CLOCK_LOW;
> >  		return 0;
> > @@ -1343,6 +1342,12 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
> >  		return 0;
> >  	}
> >  
> > +	if (mode_rate > max_rate || mode->clock > max_dotclk ||
> > +	    drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
> > +		*status = MODE_CLOCK_HIGH;
> > +		return 0;
> > +	}
> > +
> >  	if (DISPLAY_VER(dev_priv) >= 10 &&
> >  	    drm_dp_sink_supports_dsc(intel_connector->dp.dsc_dpcd)) {
> >  		/*
> > @@ -1385,7 +1390,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
> >  		return 0;
> >  	}
> >  
> > -	*status = intel_mode_valid_max_plane_size(dev_priv, mode, false);
> > +	*status = intel_mode_valid_max_plane_size(dev_priv, mode, bigjoiner);
> >  	return 0;
> >  }
> 
> -- 
> Jani Nikula, Intel