[PATCH 22/22] drm/i915/icl: WaAllowUMDToModifySamplerMode

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Required for Bindless samplers.

Do Linux UMDs make use of this? This change has been security
reviewed and the whitelisting approved. Virtualization of other
OSes could certainly use it.

v2: Rebased on top of the WA refactoring (Michel)
v3: Added References (Mika)

References: HSDES#1404695891
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_reg.h          | 2 ++
 drivers/gpu/drm/i915/intel_workarounds.c | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e41076f..c3e464c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8293,6 +8293,8 @@ enum {
 #define TR_VA_TTL3_PTR_DW0		_MMIO(0x4DE0)
 #define TR_VA_TTL3_PTR_DW1		_MMIO(0x4DE4)
 
+#define GEN10_SAMPLER_MODE		_MMIO(0xE18C)
+
 /* IVYBRIDGE DPF */
 #define GEN7_L3CDERRST1(slice)		_MMIO(0xB008 + (slice) * 0x200) /* L3CD Error Status 1 */
 #define   GEN7_L3CDERRST1_ROW_MASK	(0x7ff<<14)
diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 571b87a..f76ab3c 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -903,6 +903,9 @@ static void icl_whitelist_build(struct whitelist *w)
 	/* WaAllowUmdWriteTRTTRootTable:icl */
 	whitelist_reg(w, TR_VA_TTL3_PTR_DW0);
 	whitelist_reg(w, TR_VA_TTL3_PTR_DW1);
+
+	/* WaAllowUMDToModifySamplerMode:icl */
+	whitelist_reg(w, GEN10_SAMPLER_MODE);
 }
 
 static struct whitelist *whitelist_build(struct intel_engine_cs *engine,
-- 
1.9.1

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