Re: [Intel-gfx] [v9 06/12] drm/i915/display: Enable BT2020 for HDR on LSPCON devices

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Nov 03, 2020 at 08:58:28PM +0530, Uma Shankar wrote:
> Enable Colorspace as BT2020 if driving HDR content.Sending Colorimetry
> data for HDR using AVI infoframe. LSPCON firmware expects this and though
> SOC drives DP, for HDMI panel AVI infoframe is sent to the LSPCON device
> which transfers the same to HDMI sink.
> 
> v2: Dropped state managed in drm core as per Jani Nikula's suggestion.
> 
> v3: Aligned colorimetry handling for lspcon as per compute_avi_infoframes,
> as suggested by Ville.
> 
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_lspcon.c | 31 +++++++++++++++++----
>  1 file changed, 25 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
> index 336494b60d11..19831f5e51bf 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
> @@ -524,12 +524,31 @@ void lspcon_set_infoframes(struct intel_encoder *encoder,
>  	else
>  		frame.avi.colorspace = HDMI_COLORSPACE_RGB;
>  
> -	drm_hdmi_avi_infoframe_quant_range(&frame.avi,
> -					   conn_state->connector,
> -					   adjusted_mode,
> -					   crtc_state->limited_color_range ?
> -					   HDMI_QUANTIZATION_RANGE_LIMITED :
> -					   HDMI_QUANTIZATION_RANGE_FULL);
> +	/*
> +	 * Set the HDMI Colorspace which are supported by DP as well.
> +	 * For all others (3 combinations which are exclusive for DP),
> +	 * Let the colorspace be set to default i.e No Data.
> +	 * Fixme: Expose HDMI colorspaces for instead of DP counterparts
> +	 */
> +	drm_hdmi_avi_infoframe_colorspace(&frame.avi, conn_state);

I would suggest taking care of that FIXME + adding this in the same
patch.

> +
> +	/* nonsense combination */
> +	drm_WARN_ON(encoder->base.dev, crtc_state->limited_color_range &&
> +		    crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB);
> +
> +	if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_RGB) {
> +		drm_hdmi_avi_infoframe_quant_range(&frame.avi,
> +						   conn_state->connector,
> +						   adjusted_mode,
> +						   crtc_state->limited_color_range ?
> +						   HDMI_QUANTIZATION_RANGE_LIMITED :
> +						   HDMI_QUANTIZATION_RANGE_FULL);
> +	} else {
> +		frame.avi.quantization_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
> +		frame.avi.ycc_quantization_range = HDMI_YCC_QUANTIZATION_RANGE_LIMITED;
> +	}

This part looks like it should be a separate patch.

> +
> +	drm_hdmi_avi_infoframe_content_type(&frame.avi, conn_state);

And that one looks like it should be part of the patch that adds the
corresponding property.

>  
>  	ret = hdmi_infoframe_pack(&frame, buf, sizeof(buf));
>  	if (ret < 0) {
> -- 
> 2.26.2

-- 
Ville Syrjälä
Intel
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