drm: Enable HDR infoframe support

Enable Dynamic Range and Mastering Infoframe for HDR
content, which is defined in CEA 861.3 spec.

The metadata will be computed based on blending
policy in userspace compositors and passed as a connector
property blob to driver. The same will be sent as infoframe
to panel which support HDR.

Added the const version of infoframe for DRM metadata
for HDR.

v2: Rebase and added Ville's POC changes.

v3: No Change

v4: Addressed Shashank's review comments and merged the
patch making drm infoframe function arguments as constant.

v5: Rebase

v6: Fixed checkpatch warnings with --strict option. Addressed
Shashank's review comments and added his RB.

v7: Addressed Brian Starkey's review comments. Merged 2 patches
into one.

v8: Addressed Jonas Karlman review comments.

v9: Addressed Jonas Karlman review comments.

v10: Addressed Ville's review comments.

v11: Added BUILD_BUG_ON and sizeof instead of magic numbers as
per Ville's comments.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1558015817-12025-5-git-send-email-uma.shankar@intel.com

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index a5ef9f45fee0..73560c9437cd 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4904,6 +4904,78 @@ static bool is_hdmi2_sink(struct drm_connector *connector)
                 connector->display_info.color_formats & DRM_COLOR_FORMAT_YCRCB420;
 }
 
+static inline bool is_eotf_supported(u8 output_eotf, u8 sink_eotf)
+{
+        return sink_eotf & BIT(output_eotf);
+}
+
+/**
+ * drm_hdmi_infoframe_set_hdr_metadata() - fill an HDMI DRM infoframe with
+ *                                         HDR metadata from userspace
+ * @frame: HDMI DRM infoframe
+ * @hdr_metadata: hdr_source_metadata info from userspace
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int
+drm_hdmi_infoframe_set_hdr_metadata(struct hdmi_drm_infoframe *frame,
+                                    const struct drm_connector_state *conn_state)
+{
+        struct drm_connector *connector;
+        struct hdr_output_metadata *hdr_metadata;
+        int err;
+
+        if (!frame || !conn_state)
+                return -EINVAL;
+
+        connector = conn_state->connector;
+
+        if (!conn_state->hdr_output_metadata)
+                return -EINVAL;
+
+        hdr_metadata = conn_state->hdr_output_metadata->data;
+
+        if (!hdr_metadata || !connector)
+                return -EINVAL;
+
+        /* Sink EOTF is Bit map while infoframe is absolute values */
+        if (!is_eotf_supported(hdr_metadata->hdmi_metadata_type1.eotf,
+            connector->hdr_sink_metadata.hdmi_type1.eotf)) {
+                DRM_DEBUG_KMS("EOTF Not Supported\n");
+                return -EINVAL;
+        }
+
+        err = hdmi_drm_infoframe_init(frame);
+        if (err < 0)
+                return err;
+
+        frame->eotf = hdr_metadata->hdmi_metadata_type1.eotf;
+        frame->metadata_type = hdr_metadata->hdmi_metadata_type1.metadata_type;
+
+        BUILD_BUG_ON(sizeof(frame->display_primaries) !=
+                     sizeof(hdr_metadata->hdmi_metadata_type1.display_primaries));
+        BUILD_BUG_ON(sizeof(frame->white_point) !=
+                     sizeof(hdr_metadata->hdmi_metadata_type1.white_point));
+
+        memcpy(&frame->display_primaries,
+               &hdr_metadata->hdmi_metadata_type1.display_primaries,
+               sizeof(frame->display_primaries));
+
+        memcpy(&frame->white_point,
+               &hdr_metadata->hdmi_metadata_type1.white_point,
+               sizeof(frame->white_point));
+
+        frame->max_display_mastering_luminance =
+                hdr_metadata->hdmi_metadata_type1.max_display_mastering_luminance;
+        frame->min_display_mastering_luminance =
+                hdr_metadata->hdmi_metadata_type1.min_display_mastering_luminance;
+        frame->max_fall = hdr_metadata->hdmi_metadata_type1.max_fall;
+        frame->max_cll = hdr_metadata->hdmi_metadata_type1.max_cll;
+
+        return 0;
+}
+EXPORT_SYMBOL(drm_hdmi_infoframe_set_hdr_metadata);
+
 /**
  * drm_hdmi_avi_infoframe_from_display_mode() - fill an HDMI AVI infoframe with
  *                                              data from a DRM display mode