drm/i915: Rename intel_load_plane_csc_black()

intel_load_plane_csc_black() is specific to icl+ so deserves
a name reflecting that fact. Also rename the variables to
standard form so I won't get confused reading the code.

v2: icl+ not glk+

Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Juston Li <juston.li@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211006235704.28894-5-ville.syrjala@linux.intel.comReviewed-by: Juston Li <juston.li@intel.com>

drivers/gpu/drm/i915/display/skl_universal_plane.c

@@ -1011,29 +1011,28 @@ static u32 skl_surf_address(const struct intel_plane_state *plane_state,
 	}
 }
 
-static void intel_load_plane_csc_black(struct intel_plane *intel_plane)
+static void icl_plane_csc_load_black(struct intel_plane *plane)
 {
-	struct drm_i915_private *dev_priv = to_i915(intel_plane->base.dev);
-	enum pipe pipe = intel_plane->pipe;
-	enum plane_id plane = intel_plane->id;
-	u16 postoff = 0;
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	enum plane_id plane_id = plane->id;
+	enum pipe pipe = plane->pipe;
 
-	intel_de_write_fw(dev_priv, PLANE_CSC_COEFF(pipe, plane, 0), 0);
-	intel_de_write_fw(dev_priv, PLANE_CSC_COEFF(pipe, plane, 1), 0);
+	intel_de_write_fw(i915, PLANE_CSC_COEFF(pipe, plane_id, 0), 0);
+	intel_de_write_fw(i915, PLANE_CSC_COEFF(pipe, plane_id, 1), 0);
 
-	intel_de_write_fw(dev_priv, PLANE_CSC_COEFF(pipe, plane, 2), 0);
-	intel_de_write_fw(dev_priv, PLANE_CSC_COEFF(pipe, plane, 3), 0);
+	intel_de_write_fw(i915, PLANE_CSC_COEFF(pipe, plane_id, 2), 0);
+	intel_de_write_fw(i915, PLANE_CSC_COEFF(pipe, plane_id, 3), 0);
 
-	intel_de_write_fw(dev_priv, PLANE_CSC_COEFF(pipe, plane, 4), 0);
-	intel_de_write_fw(dev_priv, PLANE_CSC_COEFF(pipe, plane, 5), 0);
+	intel_de_write_fw(i915, PLANE_CSC_COEFF(pipe, plane_id, 4), 0);
+	intel_de_write_fw(i915, PLANE_CSC_COEFF(pipe, plane_id, 5), 0);
 
-	intel_de_write_fw(dev_priv, PLANE_CSC_PREOFF(pipe, plane, 0), 0);
-	intel_de_write_fw(dev_priv, PLANE_CSC_PREOFF(pipe, plane, 1), 0);
-	intel_de_write_fw(dev_priv, PLANE_CSC_PREOFF(pipe, plane, 2), 0);
+	intel_de_write_fw(i915, PLANE_CSC_PREOFF(pipe, plane_id, 0), 0);
+	intel_de_write_fw(i915, PLANE_CSC_PREOFF(pipe, plane_id, 1), 0);
+	intel_de_write_fw(i915, PLANE_CSC_PREOFF(pipe, plane_id, 2), 0);
 
-	intel_de_write_fw(dev_priv, PLANE_CSC_POSTOFF(pipe, plane, 0), postoff);
-	intel_de_write_fw(dev_priv, PLANE_CSC_POSTOFF(pipe, plane, 1), postoff);
-	intel_de_write_fw(dev_priv, PLANE_CSC_POSTOFF(pipe, plane, 2), postoff);
+	intel_de_write_fw(i915, PLANE_CSC_POSTOFF(pipe, plane_id, 0), 0);
+	intel_de_write_fw(i915, PLANE_CSC_POSTOFF(pipe, plane_id, 1), 0);
+	intel_de_write_fw(i915, PLANE_CSC_POSTOFF(pipe, plane_id, 2), 0);
 }
 
 static void
@@ -1102,7 +1101,7 @@ skl_program_plane(struct intel_plane *plane,
 	 * or after the commit, display content will be garbage.
 	 */
 	if (plane_state->force_black)
-		intel_load_plane_csc_black(plane);
+		icl_plane_csc_load_black(plane);
 
 	intel_de_write_fw(dev_priv, PLANE_STRIDE(pipe, plane_id), stride);
 	intel_de_write_fw(dev_priv, PLANE_POS(pipe, plane_id),