drm/i915/display: Implement DRM infoframe read for LSPCON

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.

v4: Dropped a redundant print, added Ville's RB.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201130204738.2443-14-uma.shankar@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 88c1534..e10fdb3 100644 (file)
--- 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 7768cf3..e4ff533 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
@@ -484,7 +484,10 @@ 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)
+               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 44aa6bc..e19e104 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_lspcon.h
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.h
@@ -39,5 +39,9 @@ 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__ */