drm/xe: Add Wa_14015150844 for DG2 and Xe_LPG

The workaround database tells us to set this bit, even though the bspec
indicates the bit doesn't exist on these platforms.  Since this is a
write-only register, we also can't read back its value to verify whether
it's actually working or not.  For now we'll trust that the workaround
database knows what it's talking about; if not, the hardware will just
ignore the attempt to write to a non-existent bit and it shouldn't cause
any problems.

Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://lore.kernel.org/r/20230727220920.2291913-2-matthew.d.roper@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -328,6 +328,7 @@
 
 #define XEHP_HDC_CHICKEN0					XE_REG_MCR(0xe5f0, XE_REG_OPTION_MASKED)
 #define   LSC_L1_FLUSH_CTL_3D_DATAPORT_FLUSH_EVENTS_MASK	REG_GENMASK(13, 11)
+#define   DIS_ATOMIC_CHAINING_TYPED_WRITES	REG_BIT(3)
 
 #define RT_CTRL					XE_REG_MCR(0xe530)
 #define   DIS_NULL_QUERY			REG_BIT(10)

drivers/gpu/drm/xe/xe_wa.c

@@ -490,6 +490,11 @@ static const struct xe_rtp_entry_sr engine_was[] = {
 			      */
 			     .read_mask = 0))
 	},
+	{ XE_RTP_NAME("14015150844"),
+	  XE_RTP_RULES(PLATFORM(DG2), FUNC(xe_rtp_match_first_render_or_compute)),
+	  XE_RTP_ACTIONS(SET(XEHP_HDC_CHICKEN0, DIS_ATOMIC_CHAINING_TYPED_WRITES,
+			     XE_RTP_NOCHECK))
+	},
 
 	/* PVC */
 
@@ -517,6 +522,12 @@ static const struct xe_rtp_entry_sr engine_was[] = {
 		       FUNC(xe_rtp_match_first_render_or_compute)),
 	  XE_RTP_ACTIONS(SET(ROW_CHICKEN3, DIS_FIX_EOT1_FLUSH))
 	},
+	{ XE_RTP_NAME("14015150844"),
+	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1270, 1271),
+		       FUNC(xe_rtp_match_first_render_or_compute)),
+	  XE_RTP_ACTIONS(SET(XEHP_HDC_CHICKEN0, DIS_ATOMIC_CHAINING_TYPED_WRITES,
+			     XE_RTP_NOCHECK))
+	},
 
 	{}
 };