[Intel-gfx] [v7 07/10] 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.

v2: Added proper bitmask of enabled infoframes as per Ville's
recommendation.

v3: Dropped a redundant wrapper as per Ville's comment.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdmi.c   | 7 +++----
 drivers/gpu/drm/i915/display/intel_lspcon.c | 7 ++++++-
 drivers/gpu/drm/i915/display/intel_lspcon.h | 4 ++++
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index cc0eb585c654..50bbe3bdb4c7 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -555,10 +555,9 @@ void hsw_write_infoframe(struct intel_encoder *encoder,
 	intel_de_posting_read(dev_priv, ctl_reg);
 }
 
-static void hsw_read_infoframe(struct intel_encoder *encoder,
-			       const struct intel_crtc_state *crtc_state,
-			       unsigned int type,
-			       void *frame, ssize_t len)
+void hsw_read_infoframe(struct intel_encoder *encoder,
+			const struct intel_crtc_state *crtc_state,
+			unsigned int type, void *frame, ssize_t len)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
index 70f4ae6bbda9..357b54a501e8 100644
--- a/drivers/gpu/drm/i915/display/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
@@ -502,7 +502,12 @@ 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) {
+		drm_dbg_kms(encoder->base.dev, "Read HDR metadata for lspcon\n");
+		hsw_read_infoframe(encoder, crtc_state, type,
+				   frame, len);
+	}
 }
 
 void lspcon_set_infoframes(struct intel_encoder *encoder,
diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.h b/drivers/gpu/drm/i915/display/intel_lspcon.h
index 9505e234e2fd..b1f45bd14409 100644
--- a/drivers/gpu/drm/i915/display/intel_lspcon.h
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.h
@@ -38,5 +38,9 @@ void hsw_write_infoframe(struct intel_encoder *encoder,
 			 const struct intel_crtc_state *crtc_state,
 			 unsigned int type,
 			const void *frame, ssize_t len);
+void hsw_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__ */
-- 
2.26.2