[PATCH 9/9] drm: Set the relevant infoframe field when scanning out a 3D mode

[Damien Lespiau <damien.lespiau@xxxxxxxxx>]

When scanning out a 3D mode on HDMI, we need to send an HDMI infoframe
with the corresponding layout to the sink.

Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 9d9881b..8a1ae56 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3325,6 +3325,18 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
 }
 EXPORT_SYMBOL(drm_hdmi_avi_infoframe_from_display_mode);
 
+static enum hdmi_3d_structure
+s3d_structure_from_display_mode(const struct drm_display_mode *mode)
+{
+	u32 s3d_mode = (mode->flags & DRM_MODE_FLAG_3D_MASK) >> 14;
+	int set = ffs(s3d_mode) - 1;
+
+	if (set == 7)
+		return HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF;
+
+	return set;
+}
+
 /**
  * drm_hdmi_vendor_infoframe_from_display_mode() - fill an HDMI infoframe with
  * data from a DRM display mode
@@ -3342,20 +3354,29 @@ drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
 					    const struct drm_display_mode *mode)
 {
 	int err;
+	u32 s3d_flags;
 	u8 vic;
 
 	if (!frame || !mode)
 		return -EINVAL;
 
 	vic = drm_match_hdmi_mode(mode);
-	if (!vic)
+	s3d_flags = mode->flags & DRM_MODE_FLAG_3D_MASK;
+
+	if (!vic && !s3d_flags)
+		return -EINVAL;
+
+	if (vic && s3d_flags)
 		return -EINVAL;
 
 	err = hdmi_vendor_infoframe_init(frame);
 	if (err < 0)
 		return err;
 
-	frame->vic = vic;
+	if (vic)
+		frame->vic = vic;
+	else
+		frame->s3d_struct = s3d_structure_from_display_mode(mode);
 
 	return 0;
 }
-- 
1.8.3.1

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