drm/rockchip: inno_hdmi: Correctly setup HDMI quantization range

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.
Signed-off-by: Alex Bee <knaerzche@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231222174220.55249-21-knaerzche@gmail.com

drivers/gpu/drm/rockchip/inno_hdmi.c

@@ -52,6 +52,7 @@ struct inno_hdmi_connector_state {
 	struct drm_connector_state	base;
 	unsigned int			enc_out_format;
 	unsigned int			colorimetry;
+	bool				rgb_limited_range;
 };
 
 static struct inno_hdmi *encoder_to_inno_hdmi(struct drm_encoder *encoder)
@@ -269,6 +270,18 @@ static int inno_hdmi_config_video_avi(struct inno_hdmi *hdmi,
 	else
 		frame.avi.colorspace = HDMI_COLORSPACE_RGB;
 
+	if (inno_conn_state->enc_out_format == HDMI_COLORSPACE_RGB) {
+		drm_hdmi_avi_infoframe_quant_range(&frame.avi,
+						   connector, mode,
+						   inno_conn_state->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, &frame, HDMI_INFOFRAME_TYPE_AVI);
 }
 
@@ -296,29 +309,37 @@ static int inno_hdmi_config_video_csc(struct inno_hdmi *hdmi)
 	hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL2, value);
 
 	if (inno_conn_state->enc_out_format == HDMI_COLORSPACE_RGB) {
-		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 (inno_conn_state->colorimetry == HDMI_COLORIMETRY_ITU_601) {
-		if (inno_conn_state->enc_out_format == HDMI_COLORSPACE_YUV444) {
-			csc_mode = CSC_RGB_0_255_TO_ITU601_16_235_8BIT;
+		if (inno_conn_state->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;
 		}
 	} else {
-		if (inno_conn_state->enc_out_format == HDMI_COLORSPACE_YUV444) {
-			csc_mode = CSC_RGB_0_255_TO_ITU709_16_235_8BIT;
-			auto_csc = AUTO_CSC_DISABLE;
-			c0_c2_change = C0_C2_CHANGE_DISABLE;
-			csc_enable = v_CSC_ENABLE;
+		if (inno_conn_state->colorimetry == HDMI_COLORIMETRY_ITU_601) {
+			if (inno_conn_state->enc_out_format == HDMI_COLORSPACE_YUV444) {
+				csc_mode = CSC_RGB_0_255_TO_ITU601_16_235_8BIT;
+				auto_csc = AUTO_CSC_DISABLE;
+				c0_c2_change = C0_C2_CHANGE_DISABLE;
+				csc_enable = v_CSC_ENABLE;
+			}
+		} else {
+			if (inno_conn_state->enc_out_format == HDMI_COLORSPACE_YUV444) {
+				csc_mode = CSC_RGB_0_255_TO_ITU709_16_235_8BIT;
+				auto_csc = AUTO_CSC_DISABLE;
+				c0_c2_change = C0_C2_CHANGE_DISABLE;
+				csc_enable = v_CSC_ENABLE;
+			}
 		}
 	}
 
@@ -472,6 +493,8 @@ inno_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
 		inno_conn_state->colorimetry = HDMI_COLORIMETRY_ITU_709;
 
 	inno_conn_state->enc_out_format = HDMI_COLORSPACE_RGB;
+	inno_conn_state->rgb_limited_range =
+		drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED;
 
 	return 0;
 }
@@ -558,6 +581,7 @@ static void inno_hdmi_connector_reset(struct drm_connector *connector)
 
 	inno_conn_state->colorimetry = HDMI_COLORIMETRY_ITU_709;
 	inno_conn_state->enc_out_format = HDMI_COLORSPACE_RGB;
+	inno_conn_state->rgb_limited_range = false;
 }
 
 static struct drm_connector_state *