[PATCH 1/1] drm/i915/xehp: add wait on depth stall done bit handling

[Juha-Pekka Heikkila]

Add writing of WAIT_ON_DEPTH_STALL_DONE_DISABLE for gen12. This
is performance optimization, writing this bit disables the wait.

Bspec: 46132

Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12411
Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 3 +++
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 6dba65e54cdb..7423fdd5dcaf 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1010,6 +1010,9 @@
 #define XEHP_L3SCQREG7				MCR_REG(0xb188)
 #define   BLEND_FILL_CACHING_OPT_DIS		REG_BIT(3)
 
+#define XEHP_WM_CHICKEN2			MCR_REG(0x5584)
+#define   WAIT_ON_DEPTH_STALL_DONE_DISABLE	REG_BIT(5)
+
 #define GEN11_GLBLINVL				_MMIO(0xb404)
 #define   GEN11_BANK_HASH_ADDR_EXCL_MASK	(0x7f << 5)
 #define   GEN11_BANK_HASH_ADDR_EXCL_BIT0	(1 << 5)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index db04c3ee02e2..affee4d4cee2 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1640,6 +1640,11 @@ static void gt_tuning_settings(struct intel_gt *gt, struct i915_wa_list *wal)
 		wa_mcr_write_or(wal, XEHP_L3SCQREG7, BLEND_FILL_CACHING_OPT_DIS);
 		wa_mcr_write_or(wal, XEHP_SQCM, EN_32B_ACCESS);
 	}
+
+	if (IS_GFX_GT_IP_RANGE(gt, IP_VER(12, 0), IP_VER(12, 70))) {
+		wa_mcr_write_or(wal, XEHP_WM_CHICKEN2,
+				WAIT_ON_DEPTH_STALL_DONE_DISABLE);
+	}
 }
 
 static void
-- 
2.45.2