[Intel-gfx] [RFC v2 1/6] drm/i915/dp: Add a config function for YCBCR420 outputs

[Mun, Gwan-gyeong]

On Thu, 2019-02-21 at 21:37 +0200, Ville Syrjälä wrote:
> On Thu, Feb 21, 2019 at 09:27:26PM +0200, Gwan-gyeong Mun wrote:
> > This patch checks a support of YCBCR420 outputs on an encoder
> > level.
> > If the input mode is YCBCR420-only mode then it prepares DP as an
> > YCBCR420
> > output, else it continues with RGB output mode.
> > It set output_format to INTEL_OUTPUT_FORMAT_YCBCR420 in order to
> > using
> > a pipe scaler as RGB to YCbCr 4:4:4.
> > 
> > Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> > Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_dp.c | 33
> > +++++++++++++++++++++++++++++++++
> >  1 file changed, 33 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > b/drivers/gpu/drm/i915/intel_dp.c
> > index e1a051c0fbfe..d0bf2102dfc2 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -2104,6 +2104,31 @@ intel_dp_compute_link_config(struct
> > intel_encoder *encoder,
> >  	return 0;
> >  }
> >  
> > +static bool
> > +intel_dp_ycbcr420_config(struct drm_connector *connector,
> > +			 struct intel_crtc_state *config)
> 
> s/config/crtc_state/
> 
> Let's try to avoid spreading the naming mess any further.
> 
I'll fix the naming mess.
> > +{
> > +	struct intel_crtc *intel_crtc = to_intel_crtc(config-
> > >base.crtc);
> 
> s/intel_crtc/crtc/ for the same reason.
> 
I'll fix the naming.
> > +
> > +	if (!connector->ycbcr_420_allowed) {
> > +		DRM_ERROR("Platform doesn't support YCBCR420
> > output\n");
> > +		return false;
> > +	}
> > +
> > +	config->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
> > +
> > +	/* YCBCR 420 output conversion needs a scaler */
> > +	if (skl_update_scaler_crtc(config)) {
> > +		DRM_DEBUG_KMS("Scaler allocation for output failed\n");
> > +		return false;
> > +	}
> > +
> > +	intel_pch_panel_fitting(intel_crtc, config,
> > +				DRM_MODE_SCALE_FULLSCREEN);
> > +
> > +	return true;
> > +}
> > +
> >  int
> >  intel_dp_compute_config(struct intel_encoder *encoder,
> >  			struct intel_crtc_state *pipe_config,
> > @@ -2121,6 +2146,7 @@ intel_dp_compute_config(struct intel_encoder
> > *encoder,
> >  	bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
> >  					   DP_DPCD_QUIRK_CONSTANT_N);
> >  	int ret;
> > +	struct drm_connector *connector = conn_state->connector;
> >  
> >  	if (HAS_PCH_SPLIT(dev_priv) && !HAS_DDI(dev_priv) && port !=
> > PORT_A)
> >  		pipe_config->has_pch_encoder = true;
> > @@ -2129,6 +2155,13 @@ intel_dp_compute_config(struct intel_encoder
> > *encoder,
> >  	if (lspcon->active)
> >  		lspcon_ycbcr420_config(&intel_connector->base,
> > pipe_config);
> >  
> > +	if (drm_mode_is_420_only(&connector->display_info,
> > adjusted_mode)) {
> > +		if (!intel_dp_ycbcr420_config(connector, pipe_config))
> > {
> > +			DRM_ERROR("Can't support YCBCR420 output\n");
> > +			return false;
> > +		}
> > +	}
> 
> This will clobber what lspcon_ycbcr420_config() did. So I suggest 
> 
> if (lspcon)
> 	lspcon_ycbcr420_config()
> else
> 	intel_dp_ycbcr420_config()
> 
> ie. also move the 420_only check into the function itself.
> 
I'll fix them as you guide.
> > +
> >  	pipe_config->has_drrs = false;
> >  	if (IS_G4X(dev_priv) || port == PORT_A)
> >  		pipe_config->has_audio = false;
> > -- 
> > 2.20.1
> > 
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