drm/i915/dsb: Define the contents of some intstructions bit better

Add some defines to specify what goes inside certain DSB
instructions.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606191504.18099-6-ville.syrjala@linux.intel.comReviewed-by: Uma Shankar <uma.shankar@intel.com>

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

@@ -70,17 +70,21 @@ struct intel_dsb {
 #define DSB_OPCODE_SHIFT		24
 #define DSB_OPCODE_NOOP			0x0
 #define DSB_OPCODE_MMIO_WRITE		0x1
+#define   DSB_BYTE_EN			0xf
+#define   DSB_BYTE_EN_SHIFT		20
+#define   DSB_REG_VALUE_MASK		0xfffff
 #define DSB_OPCODE_WAIT_USEC		0x2
-#define DSB_OPCODE_WAIT_LINES		0x3
+#define DSB_OPCODE_WAIT_SCANLINE	0x3
 #define DSB_OPCODE_WAIT_VBLANKS		0x4
 #define DSB_OPCODE_WAIT_DSL_IN		0x5
 #define DSB_OPCODE_WAIT_DSL_OUT		0x6
+#define   DSB_SCANLINE_UPPER_SHIFT	20
+#define   DSB_SCANLINE_LOWER_SHIFT	0
 #define DSB_OPCODE_INTERRUPT		0x7
 #define DSB_OPCODE_INDEXED_WRITE	0x9
+/* see DSB_REG_VALUE_MASK */
 #define DSB_OPCODE_POLL			0xA
-#define DSB_BYTE_EN			0xF
-#define DSB_BYTE_EN_SHIFT		20
-#define DSB_REG_VALUE_MASK		0xfffff
+/* see DSB_REG_VALUE_MASK */
 
 static bool assert_dsb_has_room(struct intel_dsb *dsb)
 {