[PATCH v2 1/2] drm/xe: Set mask bits for CCS_MODE register

[Balasubramani Vivekanandan]

CCS_MODE register requires setting mask bits from Xe2+ platforms. Set
the mask bits unconditionally, as those bits are unused for older
platforms.

Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan at intel.com>
---
 drivers/gpu/drm/xe/regs/xe_gt_regs.h | 2 +-
 drivers/gpu/drm/xe/xe_gt_ccs_mode.c  | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
index 9dd70934ca15..e136b663af98 100644
--- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
@@ -562,7 +562,7 @@
  *   [4-6]     RSVD
  *   [7]       Disabled
  */
-#define CCS_MODE				XE_REG(0x14804)
+#define CCS_MODE				XE_REG(0x14804, XE_REG_OPTION_MASKED)
 #define   CCS_MODE_CSLICE_0_3_MASK		REG_GENMASK(11, 0) /* 3 bits per cslice */
 #define   CCS_MODE_CSLICE_MASK			0x7 /* CCS0-3 + rsvd */
 #define   CCS_MODE_CSLICE_WIDTH			ilog2(CCS_MODE_CSLICE_MASK + 1)
diff --git a/drivers/gpu/drm/xe/xe_gt_ccs_mode.c b/drivers/gpu/drm/xe/xe_gt_ccs_mode.c
index 9360ac4de489..246190b3e2bb 100644
--- a/drivers/gpu/drm/xe/xe_gt_ccs_mode.c
+++ b/drivers/gpu/drm/xe/xe_gt_ccs_mode.c
@@ -68,6 +68,12 @@ static void __xe_gt_apply_ccs_mode(struct xe_gt *gt, u32 num_engines)
 		}
 	}
 
+	/*
+	 * Mask bits need to be set for the register. Though only Xe2+
+	 * platforms require setting of mask bits, it won't harm for older
+	 * platforms as these bits are unused there.
+	 */
+	mode |= CCS_MODE_CSLICE_0_3_MASK << 16;
 	xe_mmio_write32(&gt->mmio, CCS_MODE, mode);
 
 	xe_gt_dbg(gt, "CCS_MODE=%x config:%08x, num_engines:%d, num_slices:%d\n",
-- 
2.34.1