[PATCH 07/10] INTEL_DII: drm/i915/color: Add checks for extended luts

[Borah, Chaitanya Kumar]

Add functions to check extended LUTs with type struct drm_color_lut_ext

Signed-off-by: Borah, Chaitanya Kumar <chaitanya.kumar.borah at intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index bb45e6809bbf7d..016e67c2aa5343 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1434,6 +1434,46 @@ intel_color_add_affected_planes(struct intel_crtc_state *new_crtc_state)
 	return 0;
 }
 
+static int check_lut_ext_size(const struct drm_property_blob *lut, int expected)
+{
+	int len;
+
+	if (!lut)
+		return 0;
+
+	len = drm_color_lut_ext_size(lut);
+	if (len != expected) {
+		DRM_DEBUG_KMS("Invalid LUT size; got %d, expected %d\n",
+			      len, expected);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int check_ext_luts(const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	const struct drm_property_blob *degamma_lut = crtc_state->hw.degamma_lut;
+	int degamma_length;
+	u32 degamma_tests;
+
+	if (degamma_lut)
+		degamma_length = drm_color_lut_ext_size(degamma_lut);
+	else
+		degamma_length = INTEL_INFO(i915)->display.color.degamma_lut_size;
+
+	degamma_tests = INTEL_INFO(i915)->display.color.degamma_lut_tests;
+
+	if (check_lut_ext_size(degamma_lut, degamma_length))
+		return -EINVAL;
+
+	if (drm_color_lut_ext_check(degamma_lut, degamma_tests))
+		return -EINVAL;
+
+	return 0;
+}
+
 static int check_lut_size(const struct drm_property_blob *lut, int expected)
 {
 	int len;
@@ -1463,6 +1503,10 @@ static int check_luts(const struct intel_crtc_state *crtc_state)
 	if (crtc_state_is_legacy_gamma(crtc_state))
 		return 0;
 
+	/* If extended degamma property set*/
+	if (degamma_lut && crtc_state->uapi.advance_degamma_mode_active)
+		return check_ext_luts(crtc_state);
+
 	/* C8 relies on its palette being stored in the legacy LUT */
 	if (crtc_state->c8_planes) {
 		drm_dbg_kms(&dev_priv->drm,
-- 
2.25.1