diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index bc3487964fb5e..5feb2ad0209c3 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -929,6 +929,62 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_atomic_helper_check_planes);
 
+/**
+ * drm_atomic_helper_check_crtcs - validate state object for CRTC changes
+ * @state: the driver state object
+ *
+ * Check the CRTC state object such as the Gamma/Degamma LUT sizes if the new
+ * state holds them.
+ *
+ * RETURNS:
+ * Zero for success or -errno
+ */
+int drm_atomic_helper_check_crtcs(struct drm_atomic_state *state)
+{
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *new_crtc_state;
+	int i;
+
+	for_each_new_crtc_in_state (state, crtc, new_crtc_state, i) {
+		if (new_crtc_state->color_mgmt_changed &&
+		    new_crtc_state->gamma_lut) {
+			uint64_t supported_lut_size = crtc->gamma_lut_size;
+			uint32_t supported_legacy_lut_size = crtc->gamma_size;
+			uint32_t new_state_lut_size =
+				drm_color_lut_size(new_crtc_state->gamma_lut);
+
+			if (new_state_lut_size != supported_lut_size &&
+			    new_state_lut_size != supported_legacy_lut_size) {
+				drm_dbg_state(
+					state->dev,
+					"Invalid Gamma LUT size. Should be %u (or %u for legacy) but got %u.\n",
+					supported_lut_size,
+					supported_legacy_lut_size,
+					new_state_lut_size);
+				return -EINVAL;
+			}
+		}
+
+		if (new_crtc_state->color_mgmt_changed &&
+		    new_crtc_state->degamma_lut) {
+			uint32_t new_state_lut_size =
+				drm_color_lut_size(new_crtc_state->degamma_lut);
+			uint64_t supported_lut_size = crtc->degamma_lut_size;
+
+			if (new_state_lut_size != supported_lut_size) {
+				drm_dbg_state(
+					state->dev,
+					"Invalid Degamma LUT size. Should be %u but got %u.\n",
+					supported_lut_size, new_state_lut_size);
+				return -EINVAL;
+			}
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_atomic_helper_check_crtcs);
+
 /**
  * drm_atomic_helper_check - validate state object
  * @dev: DRM device
@@ -974,6 +1030,10 @@ int drm_atomic_helper_check(struct drm_device *dev,
 	if (ret)
 		return ret;
 
+	ret = drm_atomic_helper_check_crtcs(state);
+	if (ret)
+		return ret;
+
 	if (state->legacy_cursor_update)
 		state->async_update = !drm_atomic_helper_async_check(dev, state);
 
diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index bb14f488c8f6c..e5b820ce823bf 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -166,6 +166,7 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
 	struct drm_mode_config *config = &dev->mode_config;
 
 	if (degamma_lut_size) {
+		crtc->degamma_lut_size = degamma_lut_size;
 		drm_object_attach_property(&crtc->base,
 					   config->degamma_lut_property, 0);
 		drm_object_attach_property(&crtc->base,
@@ -178,6 +179,7 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
 					   config->ctm_property, 0);
 
 	if (gamma_lut_size) {
+		crtc->gamma_lut_size = gamma_lut_size;
 		drm_object_attach_property(&crtc->base,
 					   config->gamma_lut_property, 0);
 		drm_object_attach_property(&crtc->base,
@@ -585,17 +587,17 @@ int drm_plane_create_color_properties(struct drm_plane *plane,
 EXPORT_SYMBOL(drm_plane_create_color_properties);
 
 /**
- * drm_color_lut_check - check validity of lookup table
+ * drm_color_lut_channels_check - check validity of the channels in the lookup table
  * @lut: property blob containing LUT to check
  * @tests: bitmask of tests to run
  *
- * Helper to check whether a userspace-provided lookup table is valid and
- * satisfies hardware requirements.  Drivers pass a bitmask indicating which of
- * the tests in &drm_color_lut_tests should be performed.
+ * Helper to check whether each color channel of userspace-provided lookup table is valid and
+ * satisfies hardware requirements. Drivers pass a bitmask indicating which of in 
+ * &drm_color_lut_channels_tests should be performed.
  *
  * Returns 0 on success, -EINVAL on failure.
  */
-int drm_color_lut_check(const struct drm_property_blob *lut, u32 tests)
+int drm_color_lut_channels_check(const struct drm_property_blob *lut, u32 tests)
 {
 	const struct drm_color_lut *entry;
 	int i;
@@ -625,4 +627,4 @@ int drm_color_lut_check(const struct drm_property_blob *lut, u32 tests)
 
 	return 0;
 }
-EXPORT_SYMBOL(drm_color_lut_check);
+EXPORT_SYMBOL(drm_color_lut_channels_check);
diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index dab892d2251ba..a308fe52746ac 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1285,7 +1285,7 @@ static int check_luts(const struct intel_crtc_state *crtc_state)
 	const struct drm_property_blob *gamma_lut = crtc_state->hw.gamma_lut;
 	const struct drm_property_blob *degamma_lut = crtc_state->hw.degamma_lut;
 	int gamma_length, degamma_length;
-	u32 gamma_tests, degamma_tests;
+	u32 gamma_channels_tests, degamma_channels_tests;
 
 	/* Always allow legacy gamma LUT with no further checking. */
 	if (crtc_state_is_legacy_gamma(crtc_state))
@@ -1300,15 +1300,11 @@ static int check_luts(const struct intel_crtc_state *crtc_state)
 
 	degamma_length = INTEL_INFO(dev_priv)->color.degamma_lut_size;
 	gamma_length = INTEL_INFO(dev_priv)->color.gamma_lut_size;
-	degamma_tests = INTEL_INFO(dev_priv)->color.degamma_lut_tests;
-	gamma_tests = INTEL_INFO(dev_priv)->color.gamma_lut_tests;
+	degamma_channels_tests = INTEL_INFO(dev_priv)->color.degamma_lut_tests;
+	gamma_channels_tests = INTEL_INFO(dev_priv)->color.gamma_lut_tests;
 
-	if (check_lut_size(degamma_lut, degamma_length) ||
-	    check_lut_size(gamma_lut, gamma_length))
-		return -EINVAL;
-
-	if (drm_color_lut_check(degamma_lut, degamma_tests) ||
-	    drm_color_lut_check(gamma_lut, gamma_tests))
+	if (drm_color_lut_channels_check(degamma_lut, degamma_channels_tests) ||
+	    drm_color_lut_channels_check(gamma_lut, gamma_channels_tests))
 		return -EINVAL;
 
 	return 0;
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 4045e2507e11c..a22d32a7a8719 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -38,6 +38,7 @@ struct drm_atomic_state;
 struct drm_private_obj;
 struct drm_private_state;
 
+int drm_atomic_helper_check_crtcs(struct drm_atomic_state *state);
 int drm_atomic_helper_check_modeset(struct drm_device *dev,
 				struct drm_atomic_state *state);
 int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 81c298488b0c8..cb1bf361ad3e3 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -94,12 +94,12 @@ int drm_plane_create_color_properties(struct drm_plane *plane,
 				      enum drm_color_range default_range);
 
 /**
- * enum drm_color_lut_tests - hw-specific LUT tests to perform
+ * enum drm_color_lut_channels_tests - hw-specific LUT tests to perform
  *
  * The drm_color_lut_check() function takes a bitmask of the values here to
  * determine which tests to apply to a userspace-provided LUT.
  */
-enum drm_color_lut_tests {
+enum drm_color_lut_channels_tests {
 	/**
 	 * @DRM_COLOR_LUT_EQUAL_CHANNELS:
 	 *
@@ -119,5 +119,6 @@ enum drm_color_lut_tests {
 	DRM_COLOR_LUT_NON_DECREASING = BIT(1),
 };
 
-int drm_color_lut_check(const struct drm_property_blob *lut, u32 tests);
+int drm_color_lut_channels_check(const struct drm_property_blob *lut,
+				 u32 tests);
 #endif
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 2deb15d7e1610..cabd3ef1a6e32 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1072,6 +1072,17 @@ struct drm_crtc {
 	/** @funcs: CRTC control functions */
 	const struct drm_crtc_funcs *funcs;
 
+	/**
+	 * @degamma_lut_size: Size of degamma LUT.
+	 */
+	uint32_t degamma_lut_size;
+
+	/**
+	 * @gamma_lut_size: Size of Gamma LUT. Not used by legacy userspace such as
+	 * X, which doesn't support large lut sizes.
+	 */
+	uint32_t gamma_lut_size;
+
 	/**
 	 * @gamma_size: Size of legacy gamma ramp reported to userspace. Set up
 	 * by calling drm_mode_crtc_set_gamma_size().
