drm/xe: Move Wa_15015404425 to use the new XE_DEVICE_WA macro

Move Wa_15015404425 to use the new implemented OOB macro XE_DEVICE_WA()

v2: rename from SoC to Device
v5: move workaround call back into the flush call
v6: remove redundant commenting

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://lore.kernel.org/r/20250709221605.172516-6-matthew.s.atwood@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

Author: msatwood

drivers/gpu/drm/xe/xe_device_wa_oob.rules

@@ -0,0 +1 @@
+15015404425     PLATFORM(LUNARLAKE)

drivers/gpu/drm/xe/xe_mmio.c

@@ -22,6 +22,9 @@
 #include "xe_macros.h"
 #include "xe_sriov.h"
 #include "xe_trace.h"
+#include "xe_wa.h"
+
+#include "generated/xe_device_wa_oob.h"
 
 static void tiles_fini(void *arg)
 {
@@ -167,7 +170,7 @@ static void mmio_flush_pending_writes(struct xe_mmio *mmio)
 #define DUMMY_REG_OFFSET	0x130030
 	int i;
 
-	if (mmio->tile->xe->info.platform != XE_LUNARLAKE)
+	if (!XE_DEVICE_WA(mmio->tile->xe, 15015404425))
 		return;
 
 	/* 4 dummy writes */
@@ -180,7 +183,6 @@ u8 xe_mmio_read8(struct xe_mmio *mmio, struct xe_reg reg)
 	u32 addr = xe_mmio_adjusted_addr(mmio, reg.addr);
 	u8 val;
 
-	/* Wa_15015404425 */
 	mmio_flush_pending_writes(mmio);
 
 	val = readb(mmio->regs + addr);
@@ -194,7 +196,6 @@ u16 xe_mmio_read16(struct xe_mmio *mmio, struct xe_reg reg)
 	u32 addr = xe_mmio_adjusted_addr(mmio, reg.addr);
 	u16 val;
 
-	/* Wa_15015404425 */
 	mmio_flush_pending_writes(mmio);
 
 	val = readw(mmio->regs + addr);
@@ -221,7 +222,6 @@ u32 xe_mmio_read32(struct xe_mmio *mmio, struct xe_reg reg)
 	u32 addr = xe_mmio_adjusted_addr(mmio, reg.addr);
 	u32 val;
 
-	/* Wa_15015404425 */
 	mmio_flush_pending_writes(mmio);
 
 	if (!reg.vf && IS_SRIOV_VF(mmio->tile->xe))