[Intel-gfx] [PATCH v2 2/5] drm/edid: Introduce drm_default_rgb_quant_range()

[Ville Syrjälä]

On Thu, Jan 12, 2017 at 11:29:18AM +0200, Jani Nikula wrote:
> On Wed, 11 Jan 2017, ville.syrjala at linux.intel.com wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > Make the code selecting the RGB quantization range a little less magicy
> > by wrapping it up in a small helper.
> >
> > v2: s/adjusted_mode/mode in vc4 to make it actually compile
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/drm_edid.c        | 18 ++++++++++++++++++
> >  drivers/gpu/drm/i915/intel_dp.c   |  4 +++-
> >  drivers/gpu/drm/i915/intel_hdmi.c |  3 ++-
> >  drivers/gpu/drm/vc4/vc4_hdmi.c    |  4 +++-
> >  include/drm/drm_edid.h            |  2 ++
> >  5 files changed, 28 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> > index 4ff04aa84dd0..304c583b8000 100644
> > --- a/drivers/gpu/drm/drm_edid.c
> > +++ b/drivers/gpu/drm/drm_edid.c
> > @@ -3768,6 +3768,24 @@ bool drm_rgb_quant_range_selectable(struct edid *edid)
> >  }
> >  EXPORT_SYMBOL(drm_rgb_quant_range_selectable);
> >  
> > +/**
> > + * drm_default_rgb_quant_range - default RGB quantization range
> > + * @mode: display mode
> > + *
> > + * Determine the default RGB quantization range for the mode,
> > + * as specified in CEA-861.
> > + *
> > + * Return: The default RGB quantization range for the mode
> > + */
> > +enum hdmi_quantization_range
> > +drm_default_rgb_quant_range(const struct drm_display_mode *mode)
> > +{
> > +	return drm_match_cea_mode(mode) > 1 ?
> > +		HDMI_QUANTIZATION_RANGE_LIMITED :
> > +		HDMI_QUANTIZATION_RANGE_FULL;
> > +}
> > +EXPORT_SYMBOL(drm_default_rgb_quant_range);
> 
> Or just bool drm_default_to_limited_range() or similar?

That's what I had initially, but then I thought it might be better to
start moving towards something a bit more explicit everwhere. But I
stopped short of actually making the drivers store the enum in their
state. We might want to do that, I think.

> 
> *shrug*
> 
> Reviewed-by: Jani Nikula <jani.nikula at intel.com>
> 
> 
> 
> > +
> >  static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
> >  					   const u8 *hdmi)
> >  {
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 343e1d9fa761..d4befbbe834a 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -1713,7 +1713,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> >  		 * VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry
> >  		 */
> >  		pipe_config->limited_color_range =
> > -			bpp != 18 && drm_match_cea_mode(adjusted_mode) > 1;
> > +			bpp != 18 &&
> > +			drm_default_rgb_quant_range(adjusted_mode) ==
> > +			HDMI_QUANTIZATION_RANGE_LIMITED;
> >  	} else {
> >  		pipe_config->limited_color_range =
> >  			intel_dp->limited_color_range;
> > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> > index 0bcfead14571..19bd13f53729 100644
> > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > @@ -1330,7 +1330,8 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> >  		/* See CEA-861-E - 5.1 Default Encoding Parameters */
> >  		pipe_config->limited_color_range =
> >  			pipe_config->has_hdmi_sink &&
> > -			drm_match_cea_mode(adjusted_mode) > 1;
> > +			drm_default_rgb_quant_range(adjusted_mode) ==
> > +			HDMI_QUANTIZATION_RANGE_LIMITED;
> >  	} else {
> >  		pipe_config->limited_color_range =
> >  			intel_hdmi->limited_color_range;
> > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> > index c4cb2e26de32..5d49bf948162 100644
> > --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> > @@ -463,7 +463,9 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
> >  	csc_ctl = VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
> >  				VC4_HD_CSC_CTL_ORDER);
> >  
> > -	if (vc4_encoder->hdmi_monitor && drm_match_cea_mode(mode) > 1) {
> > +	if (vc4_encoder->hdmi_monitor &&
> > +	    drm_default_rgb_quant_range(mode) ==
> > +	    HDMI_QUANTIZATION_RANGE_LIMITED) {
> >  		/* CEA VICs other than #1 requre limited range RGB
> >  		 * output unless overridden by an AVI infoframe.
> >  		 * Apply a colorspace conversion to squash 0-255 down
> > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> > index 838eaf2b42e9..25cdf5f7a0d8 100644
> > --- a/include/drm/drm_edid.h
> > +++ b/include/drm/drm_edid.h
> > @@ -441,6 +441,8 @@ enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code);
> >  bool drm_detect_hdmi_monitor(struct edid *edid);
> >  bool drm_detect_monitor_audio(struct edid *edid);
> >  bool drm_rgb_quant_range_selectable(struct edid *edid);
> > +enum hdmi_quantization_range
> > +drm_default_rgb_quant_range(const struct drm_display_mode *mode);
> >  int drm_add_modes_noedid(struct drm_connector *connector,
> >  			 int hdisplay, int vdisplay);
> >  void drm_set_preferred_mode(struct drm_connector *connector,
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center

-- 
Ville Syrjälä
Intel OTC