Re: [PATCH v4 17/17] drm/amd/display: Add handling for new "Broadcast RGB" property

[Pekka Paalanen <ppaalanen@gmail.com>]

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On Fri, 18 Jun 2021 11:11:16 +0200
Werner Sembach <wse@tuxedocomputers.com> wrote:

> This commit implements the "Broadcast RGB" drm property for the AMD GPU
> driver.
> 
> Signed-off-by: Werner Sembach <wse@tuxedocomputers.com>
> ---
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 22 ++++++++++++++-----
>  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  4 ++++
>  2 files changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 9ffd2f9d3d75..c5dbf948a47a 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -5252,7 +5252,8 @@ get_aspect_ratio(const struct drm_display_mode *mode_in)
>  }
>  
>  static enum dc_color_space
> -get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing)
> +get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing,
> +		       enum drm_mode_color_range preferred_color_range)
>  {
>  	enum dc_color_space color_space = COLOR_SPACE_SRGB;
>  
> @@ -5267,13 +5268,17 @@ get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing)
>  		 * respectively
>  		 */
>  		if (dc_crtc_timing->pix_clk_100hz > 270300) {
> -			if (dc_crtc_timing->flags.Y_ONLY)
> +			if (dc_crtc_timing->flags.Y_ONLY
> +					|| preferred_color_range ==
> +						DRM_MODE_COLOR_RANGE_LIMITED_16_235)
>  				color_space =
>  					COLOR_SPACE_YCBCR709_LIMITED;
>  			else
>  				color_space = COLOR_SPACE_YCBCR709;

Hi,

does this mean that amdgpu would be using a property named "Broadcast
RGB" to control the range of YCbCr too?

That is surprising. If this is truly wanted, then the documentation of
"Broadcast RGB" must say that it applies to YCbCr too.

Does amdgpu do the same as intel wrt. to the question about whose
responsibility it is to make the pixels at the connector to match the
set range?


Thanks,
pq

>  		} else {
> -			if (dc_crtc_timing->flags.Y_ONLY)
> +			if (dc_crtc_timing->flags.Y_ONLY
> +					|| preferred_color_range ==
> +						DRM_MODE_COLOR_RANGE_LIMITED_16_235)
>  				color_space =
>  					COLOR_SPACE_YCBCR601_LIMITED;
>  			else
> @@ -5283,7 +5288,10 @@ get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing)
>  	}
>  	break;
>  	case PIXEL_ENCODING_RGB:
> -		color_space = COLOR_SPACE_SRGB;
> +		if (preferred_color_range == DRM_MODE_COLOR_RANGE_LIMITED_16_235)
> +			color_space = COLOR_SPACE_SRGB_LIMITED;
> +		else
> +			color_space = COLOR_SPACE_SRGB;
>  		break;
>  
>  	default:
> @@ -5429,7 +5437,10 @@ static void fill_stream_properties_from_drm_display_mode(
>  
>  	timing_out->aspect_ratio = get_aspect_ratio(mode_in);
>  
> -	stream->output_color_space = get_output_color_space(timing_out);
> +	stream->output_color_space = get_output_color_space(timing_out,
> +							    connector_state ?
> +							    connector_state->preferred_color_range :
> +							    DRM_MODE_COLOR_RANGE_UNSET);
>  
>  	stream->out_transfer_func->type = TF_TYPE_PREDEFINED;
>  	stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
> @@ -7780,6 +7791,7 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
>  		drm_connector_attach_active_bpc_property(&aconnector->base, 8, 16);
>  		drm_connector_attach_preferred_color_format_property(&aconnector->base);
>  		drm_connector_attach_active_color_format_property(&aconnector->base);
> +		drm_connector_attach_preferred_color_range_property(&aconnector->base);
>  		drm_connector_attach_active_color_range_property(&aconnector->base);
>  	}
>  
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 2563788ba95a..80e1389fd0ec 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -421,6 +421,10 @@ dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
>  	if (connector->active_color_format_property)
>  		drm_connector_attach_active_color_format_property(&aconnector->base);
>  
> +	connector->preferred_color_range_property = master->base.preferred_color_range_property;
> +	if (connector->preferred_color_range_property)
> +		drm_connector_attach_preferred_color_range_property(&aconnector->base);
> +
>  	connector->active_color_range_property = master->base.active_color_range_property;
>  	if (connector->active_color_range_property)
>  		drm_connector_attach_active_color_range_property(&aconnector->base);


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