Re: [PATCH 04/11] drm/rockchip: inno_hdmi: Correctly setup HDMI quantization range

[Maxime Ripard]

Hi Alex,

Thanks for working on this!

On Wed, Dec 13, 2023 at 08:51:18PM +0100, Alex Bee wrote:
> The display controller will always give full range RGB regardless of the
> mode set, but HDMI requires certain modes to be transmitted in limited
> range RGB. This is especially required for HDMI sinks which do not support
> non-standard quantization ranges.
> 
> This enables color space conversion for those modes and sets the
> quantization range accordingly in the AVI infoframe.
> 
> Fixes: 412d4ae6b7a5 ("drm/rockchip: hdmi: add Innosilicon HDMI support")
> Signed-off-by: Alex Bee <knaerzche@xxxxxxxxx>
> ---
>  drivers/gpu/drm/rockchip/inno_hdmi.c | 40 ++++++++++++++++++++++------
>  1 file changed, 32 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/inno_hdmi.c b/drivers/gpu/drm/rockchip/inno_hdmi.c
> index 345253e033c5..32626a75723c 100644
> --- a/drivers/gpu/drm/rockchip/inno_hdmi.c
> +++ b/drivers/gpu/drm/rockchip/inno_hdmi.c
> @@ -33,6 +33,7 @@ struct hdmi_data_info {
>  	unsigned int enc_in_format;
>  	unsigned int enc_out_format;
>  	unsigned int colorimetry;
> +	bool rgb_limited_range;
>  };
>  
>  struct inno_hdmi_i2c {
> @@ -308,6 +309,18 @@ static int inno_hdmi_config_video_avi(struct inno_hdmi *hdmi,
>  	else
>  		frame.avi.colorspace = HDMI_COLORSPACE_RGB;
>  
> +	if (hdmi->hdmi_data.enc_out_format == HDMI_COLORSPACE_RGB) {
> +		drm_hdmi_avi_infoframe_quant_range(&frame.avi,
> +						   &hdmi->connector, mode,
> +						   hdmi->hdmi_data.rgb_limited_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;
> +	}
> +
>  	return inno_hdmi_upload_frame(hdmi, rc, &frame, INFOFRAME_AVI, 0, 0, 0);
>  }
>  
> @@ -334,14 +347,22 @@ static int inno_hdmi_config_video_csc(struct inno_hdmi *hdmi)
>  	if (data->enc_in_format == data->enc_out_format) {
>  		if ((data->enc_in_format == HDMI_COLORSPACE_RGB) ||
>  		    (data->enc_in_format >= HDMI_COLORSPACE_YUV444)) {
> -			value = v_SOF_DISABLE | v_COLOR_DEPTH_NOT_INDICATED(1);
> -			hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL3, value);
> -
> -			hdmi_modb(hdmi, HDMI_VIDEO_CONTRL,
> -				  m_VIDEO_AUTO_CSC | m_VIDEO_C0_C2_SWAP,
> -				  v_VIDEO_AUTO_CSC(AUTO_CSC_DISABLE) |
> -				  v_VIDEO_C0_C2_SWAP(C0_C2_CHANGE_DISABLE));
> -			return 0;
> +			if (data->enc_in_format == HDMI_COLORSPACE_RGB &&
> +			    data->enc_out_format == HDMI_COLORSPACE_RGB &&
> +			    hdmi->hdmi_data.rgb_limited_range) {
> +				csc_mode = CSC_RGB_0_255_TO_RGB_16_235_8BIT;
> +				auto_csc = AUTO_CSC_DISABLE;
> +				c0_c2_change = C0_C2_CHANGE_DISABLE;
> +				csc_enable = v_CSC_ENABLE;
> +			} else {
> +				value = v_SOF_DISABLE | v_COLOR_DEPTH_NOT_INDICATED(1);
> +				hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL3, value);
> +				hdmi_modb(hdmi, HDMI_VIDEO_CONTRL,
> +					  m_VIDEO_AUTO_CSC | m_VIDEO_C0_C2_SWAP,
> +					  v_VIDEO_AUTO_CSC(AUTO_CSC_DISABLE) |
> +					  v_VIDEO_C0_C2_SWAP(C0_C2_CHANGE_DISABLE));
> +				return 0;
> +			}
>  		}
>  	}
>  
> @@ -458,6 +479,9 @@ static int inno_hdmi_setup(struct inno_hdmi *hdmi,
>  	else
>  		hdmi->hdmi_data.colorimetry = HDMI_COLORIMETRY_ITU_709;
>  
> +	hdmi->hdmi_data.rgb_limited_range =
> +		drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED;
> +

This patch conflicts heavily with my inno_hdmi patches here (patches 22 to 38):
https://lore.kernel.org/dri-devel/20231207-kms-hdmi-connector-state-v5-0-6538e19d634d@xxxxxxxxxx/

I would appreciate if you could test and merge them into your series.

In particular, there's no need to store the range here: enc_out_format
is always RGB, so you'll always end up calling
drm_hdmi_avi_infoframe_quant_range(), and you'll always have the same csc values.

Maxime

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