[PATCH v4 08/15] drm: set output colorspace in AVI infoframe

[Shashank Sharma]

HDMI source must set output colorspace information in AVI
infoframes, so that the sink can decode upcoming frames
accordingly.

As this patch series is adding support for HDMI output modes
other than RGB, this patch adds a function in DRM layer, to
add the output colorspace information in the AVI infoframes.

V2: Rebase
V3: Rebase

Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Jose Abreu <Jose.Abreu at synopsys.com>
Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/drm_edid.c | 40 ++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_edid.h     |  5 +++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 42934b2..edba190 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4782,6 +4782,46 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
 EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode);
 
 /**
+ * drm_hdmi_avi_infoframe_set_colorspace - fill an HDMI AVI infoframe with
+ * colorspace data of the output type
+ *
+ * @frame: HDMI AVI infoframe
+ * @mode: DRM display mode
+ * @hdmi_output: HDMI output colorspace
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int
+drm_hdmi_avi_infoframe_set_colorspace(struct hdmi_avi_infoframe *frame,
+					 const struct drm_display_mode *mode,
+					 enum drm_hdmi_output_type hdmi_output)
+{
+	switch (hdmi_output) {
+	case DRM_HDMI_OUTPUT_YCBCR444:
+		frame->colorspace = HDMI_COLORSPACE_YUV444;
+		break;
+	case DRM_HDMI_OUTPUT_YCBCR422:
+		frame->colorspace = HDMI_COLORSPACE_YUV422;
+		break;
+	case DRM_HDMI_OUTPUT_YCBCR420:
+		frame->colorspace = HDMI_COLORSPACE_YUV420;
+		frame->pixel_repeat = 0;
+		break;
+	case DRM_HDMI_OUTPUT_DEFAULT_RGB:
+		frame->colorspace = HDMI_COLORSPACE_RGB;
+		break;
+	case DRM_HDMI_OUTPUT_YCBCR_HQ:
+	case DRM_HDMI_OUTPUT_YCBCR_LQ:
+	case DRM_HDMI_OUTPUT_INVALID:
+		DRM_ERROR("Invalid HDMI output type\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_hdmi_avi_infoframe_set_colorspace);
+
+/**
  * drm_hdmi_avi_infoframe_quant_range() - fill the HDMI AVI infoframe
  *                                        quantization range information
  * @frame: HDMI AVI infoframe
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index d4ff17c..3ea833f 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -329,6 +329,7 @@ struct cea_sad {
 struct drm_encoder;
 struct drm_connector;
 struct drm_display_mode;
+enum drm_hdmi_output_type;
 
 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
 int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads);
@@ -351,6 +352,10 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
 					 const struct drm_display_mode *mode,
 					 bool is_hdmi2_sink);
 int
+drm_hdmi_avi_infoframe_set_colorspace(struct hdmi_avi_infoframe *frame,
+					 const struct drm_display_mode *mode,
+					 enum drm_hdmi_output_type hdmi_output);
+int
 drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
 					    const struct drm_display_mode *mode);
 void
-- 
2.7.4