drm/i915: Add PLANE_CHICKEN registers

Define the PLANE_CHICKEN register offsets.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230320090522.9909-5-ville.syrjala@linux.intel.comReviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>

drivers/gpu/drm/i915/i915_reg.h

@@ -4644,6 +4644,8 @@
 #define   PLANE_COLOR_ALPHA_DISABLE			REG_FIELD_PREP(PLANE_COLOR_ALPHA_MASK, 0)
 #define   PLANE_COLOR_ALPHA_SW_PREMULTIPLY		REG_FIELD_PREP(PLANE_COLOR_ALPHA_MASK, 2)
 #define   PLANE_COLOR_ALPHA_HW_PREMULTIPLY		REG_FIELD_PREP(PLANE_COLOR_ALPHA_MASK, 3)
+#define _PLANE_CHICKEN_1_A			0x7026C
+#define _PLANE_CHICKEN_2_A			0x7036C
 #define _PLANE_BUF_CFG_1_A			0x7027c
 #define _PLANE_BUF_CFG_2_A			0x7037c
 #define _PLANE_NV12_BUF_CFG_1_A		0x70278
@@ -4789,6 +4791,13 @@
 #define PLANE_SURFLIVE(pipe, plane)	\
 	_MMIO_PLANE(plane, _PLANE_SURFLIVE_1(pipe), _PLANE_SURFLIVE_2(pipe))
 
+#define _PLANE_CHICKEN_1_B			0x7126c
+#define _PLANE_CHICKEN_2_B			0x7136c
+#define _PLANE_CHICKEN_1(pipe)	_PIPE(pipe, _PLANE_CHICKEN_1_A, _PLANE_CHICKEN_1_B)
+#define _PLANE_CHICKEN_2(pipe)	_PIPE(pipe, _PLANE_CHICKEN_2_A, _PLANE_CHICKEN_2_B)
+#define PLANE_CHICKEN(pipe, plane) \
+	_MMIO_PLANE(plane, _PLANE_CHICKEN_1(pipe), _PLANE_CHICKEN_2(pipe))
+
 #define _PLANE_BUF_CFG_1_B			0x7127c
 #define _PLANE_BUF_CFG_2_B			0x7137c
 /* skl+: 10 bits, icl+ 11 bits, adlp+ 12 bits */