drm/i915/color: Add framework to program CSC

Add framework to program CSC. It enables copying of matrix from UAPI
to intel plane state. Also add helper functions which will eventually
program values to hardware.

Add a crtc state variable to track plane color change.

v2:
- Add crtc_state->plane_color_changed
- Improve comments (Suraj)
- s/intel_plane_*_color/intel_plane_color_* (Suraj)

v3:
- align parameters with open braces (Suraj)
- Improve commit message (Suraj)

v4:
- Re-arrange variable declaration (Suraj)

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patch.msgid.link/20251203085211.3663374-6-uma.shankar@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_plane.c b/drivers/gpu/drm/i915/display/intel_plane.c
index 5105e3278bc4..ad25af7394a6 100644
--- a/drivers/gpu/drm/i915/display/intel_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_plane.c
@@ -49,6 +49,7 @@
 #include "i9xx_plane_regs.h"
 #include "intel_cdclk.h"
 #include "intel_cursor.h"
+#include "intel_colorop.h"
 #include "intel_display_rps.h"
 #include "intel_display_trace.h"
 #include "intel_display_types.h"
@@ -336,6 +337,52 @@ intel_plane_copy_uapi_plane_damage(struct intel_plane_state *new_plane_state,
 		*damage = drm_plane_state_src(&new_uapi_plane_state->uapi);
 }
 
+static bool
+intel_plane_colorop_replace_blob(struct intel_plane_state *plane_state,
+				 struct intel_colorop *intel_colorop,
+				 struct drm_property_blob *blob)
+{
+	if (intel_colorop->id == INTEL_PLANE_CB_CSC)
+		return drm_property_replace_blob(&plane_state->hw.ctm, blob);
+
+	return false;
+}
+
+static void
+intel_plane_color_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
+					const struct intel_plane_state *from_plane_state,
+					struct intel_crtc *crtc)
+{
+	struct drm_colorop *iter_colorop, *colorop;
+	struct drm_colorop_state *new_colorop_state;
+	struct drm_atomic_state *state = plane_state->uapi.state;
+	struct intel_colorop *intel_colorop;
+	struct drm_property_blob *blob;
+	struct intel_atomic_state *intel_atomic_state = to_intel_atomic_state(state);
+	struct intel_crtc_state *new_crtc_state = intel_atomic_state ?
+		intel_atomic_get_new_crtc_state(intel_atomic_state, crtc) : NULL;
+	bool changed = false;
+	int i = 0;
+
+	iter_colorop = plane_state->uapi.color_pipeline;
+
+	while (iter_colorop) {
+		for_each_new_colorop_in_state(state, colorop, new_colorop_state, i) {
+			if (new_colorop_state->colorop == iter_colorop) {
+				blob = new_colorop_state->bypass ? NULL : new_colorop_state->data;
+				intel_colorop = to_intel_colorop(colorop);
+				changed |= intel_plane_colorop_replace_blob(plane_state,
+									    intel_colorop,
+									    blob);
+			}
+		}
+		iter_colorop = iter_colorop->next;
+	}
+
+	if (new_crtc_state && changed)
+		new_crtc_state->plane_color_changed = true;
+}
+
 void intel_plane_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
 				       const struct intel_plane_state *from_plane_state,
 				       struct intel_crtc *crtc)
@@ -364,6 +411,8 @@ void intel_plane_copy_uapi_to_hw_state(struct intel_plane_state *plane_state,
 
 	plane_state->uapi.src = drm_plane_state_src(&from_plane_state->uapi);
 	plane_state->uapi.dst = drm_plane_state_dest(&from_plane_state->uapi);
+
+	intel_plane_color_copy_uapi_to_hw_state(plane_state, from_plane_state, crtc);
 }
 
 void intel_plane_copy_hw_state(struct intel_plane_state *plane_state,