[Intel-gfx] [PATCH] drm/i915: Fix bigjoiner case for DP2.0

[Srinivas, Vidya]

> -----Original Message-----
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Sent: Friday, October 13, 2023 4:14 PM
> To: Srinivas, Vidya <vidya.srinivas at intel.com>
> Cc: intel-gfx at lists.freedesktop.org
> Subject: Re: [Intel-gfx] [PATCH] drm/i915: Fix bigjoiner case for DP2.0
> 
> On Fri, Oct 13, 2023 at 01:00:00AM +0530, vsrini4 wrote:
> > Patch calculates bigjoiner pipes in mst compute.
> > Patch also passes bigjoiner bool to validate plane max size.
> 
> I doubt this is sufficient. The modeset sequence is still all wrong for
> bigjoiner+mst.

Hello Ville, Many thanks for your reply.
Could you kindly help on this issue. Just floated this patch for reference only.
As you said, Monitor lights up but inconsistent also. I am not well-versed to
make a proper fix. Request your help please. Thanks a lot.

Regards
Vidya

> 
> >
> > Signed-off-by: vsrini4 <vidya.srinivas at 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 e3f176a093d2..f499ce39b2a8 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > @@ -308,6 +308,7 @@ 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 drm_display_mode *adjusted_mode = @@ -318,6
> +319,10 @@
> > 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; @@ -936,12 +941,6 @@
> > intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
> >  	if (ret)
> >  		return ret;
> >
> > -	if (mode_rate > max_rate || mode->clock > max_dotclk ||
> > -	    drm_dp_calc_pbn_mode(mode->clock, min_bpp, false) > port-
> >full_pbn) {
> > -		*status = MODE_CLOCK_HIGH;
> > -		return 0;
> > -	}
> > -
> >  	if (mode->clock < 10000) {
> >  		*status = MODE_CLOCK_LOW;
> >  		return 0;
> > @@ -957,6 +956,12 @@ intel_dp_mst_mode_valid_ctx(struct
> drm_connector *connector,
> >  		max_dotclk *= 2;
> >  	}
> >
> > +	if (mode_rate > max_rate || mode->clock > max_dotclk ||
> > +	    drm_dp_calc_pbn_mode(mode->clock, min_bpp, false) > port-
> >full_pbn) {
> > +		*status = MODE_CLOCK_HIGH;
> > +		return 0;
> > +	}
> > +
> >  	if (DISPLAY_VER(dev_priv) >= 10 &&
> >  	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
> >  		/*
> > @@ -994,7 +999,7 @@ intel_dp_mst_mode_valid_ctx(struct
> drm_connector *connector,
> >  	if (mode_rate > max_rate && !dsc)
> >  		return MODE_CLOCK_HIGH;
> >
> > -	*status = intel_mode_valid_max_plane_size(dev_priv, mode, false);
> > +	*status = intel_mode_valid_max_plane_size(dev_priv, mode,
> > +bigjoiner);
> >  	return 0;
> >  }
> >
> > --
> > 2.33.0
> 
> --
> Ville Syrjälä
> Intel