[Intel-gfx] [v3 7/8] drm/i915/display: Implement DRM infoframe read for LSPCON

[Uma Shankar]

Implement Read back of HDR metadata infoframes i.e Dynamic Range
and Mastering Infoframe for LSPCON devices.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdmi.c   | 10 ++++++++++
 drivers/gpu/drm/i915/display/intel_lspcon.c |  6 +++++-
 drivers/gpu/drm/i915/display/intel_lspcon.h |  4 ++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 53103ef72a58..786378442dd2 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -600,6 +600,16 @@ void lspcon_drm_write_infoframe(struct intel_encoder *encoder,
 	hsw_write_infoframe(encoder, crtc_state, type, frame, len);
 }
 
+void lspcon_drm_read_infoframe(struct intel_encoder *encoder,
+			       const struct intel_crtc_state *crtc_state,
+			       unsigned int type,
+			       void *frame, ssize_t len)
+{
+	drm_dbg_kms(encoder->base.dev, "Read HDR metadata for lspcon\n");
+	/* It uses the legacy hsw implementation for the same */
+	hsw_read_infoframe(encoder, crtc_state, type, frame, len);
+}
+
 static const u8 infoframe_type_to_idx[] = {
 	HDMI_PACKET_TYPE_GENERAL_CONTROL,
 	HDMI_PACKET_TYPE_GAMUT_METADATA,
diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
index 0ebe9a700291..8d1bd2da1e73 100644
--- a/drivers/gpu/drm/i915/display/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
@@ -501,7 +501,11 @@ void lspcon_read_infoframe(struct intel_encoder *encoder,
 			   unsigned int type,
 			   void *frame, ssize_t len)
 {
-	/* FIXME implement this */
+	/* FIXME implement for AVI Infoframe as well */
+	if (type == HDMI_PACKET_TYPE_GAMUT_METADATA)
+		lspcon_drm_read_infoframe(encoder, crtc_state,
+					  HDMI_PACKET_TYPE_GAMUT_METADATA,
+					  frame, VIDEO_DIP_DATA_SIZE);
 }
 
 /* HDMI HDR Colorspace Spec Definitions */
diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.h b/drivers/gpu/drm/i915/display/intel_lspcon.h
index b2051f236223..68d2d835bd86 100644
--- a/drivers/gpu/drm/i915/display/intel_lspcon.h
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.h
@@ -38,4 +38,8 @@ void lspcon_drm_write_infoframe(struct intel_encoder *encoder,
 				const struct intel_crtc_state *crtc_state,
 				unsigned int type,
 				const void *frame, ssize_t len);
+void lspcon_drm_read_infoframe(struct intel_encoder *encoder,
+			       const struct intel_crtc_state *crtc_state,
+			       unsigned int type,
+			       void *frame, ssize_t len);
 #endif /* __INTEL_LSPCON_H__ */
-- 
2.22.0