[Intel-gfx] [PATCH 1/2] drm/i915/gen9: Add WaInPlaceDecompressionHang

[Mika Kuoppala]

From: Mika Kuoppala <mika.kuoppala at linux.intel.com>

Add this workaround to prevent hang when in place compression
is used.

References: HSD#2135774
Cc: stable at vger.kernel.org
Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
Reviewed-by: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |  2 ++
 drivers/gpu/drm/i915/i915_reg.h         |  3 +++
 drivers/gpu/drm/i915/intel_ringbuffer.c | 14 ++++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e163a9487750..7f1003046caa 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2580,6 +2580,8 @@ struct drm_i915_cmd_table {
 #define SKL_REVID_D0		0x3
 #define SKL_REVID_E0		0x4
 #define SKL_REVID_F0		0x5
+#define SKL_REVID_G0		0x6
+#define SKL_REVID_H0		0x7
 
 #define IS_SKL_REVID(p, since, until) (IS_SKYLAKE(p) && IS_REVID(p, since, until))
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8bfde75789f6..ce14fe09d962 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1686,6 +1686,9 @@ enum skl_disp_power_wells {
 
 #define GEN7_TLB_RD_ADDR	_MMIO(0x4700)
 
+#define GEN9_GAMT_ECO_REG_RW_IA _MMIO(0x4ab0)
+#define   GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS	(1<<18)
+
 #define GAMT_CHKN_BIT_REG	_MMIO(0x4ab8)
 #define   GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING	(1<<28)
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index af0bd71e3a36..75cede0147f7 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1104,6 +1104,11 @@ static int skl_init_workarounds(struct intel_engine_cs *engine)
 	/* WaDisableGafsUnitClkGating:skl */
 	WA_SET_BIT(GEN7_UCGCTL4, GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE);
 
+	/* WaInPlaceDecompressionHang:skl */
+	if (IS_SKL_REVID(dev_priv, SKL_REVID_H0, REVID_FOREVER))
+		WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
+			   GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
+
 	/* WaDisableLSQCROPERFforOCL:skl */
 	ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
 	if (ret)
@@ -1173,6 +1178,11 @@ static int bxt_init_workarounds(struct intel_engine_cs *engine)
 		WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
 				  GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
 
+	/* WaInPlaceDecompressionHang:bxt */
+	if (IS_BXT_REVID(dev_priv, BXT_REVID_C0, REVID_FOREVER))
+		WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
+			   GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
+
 	return 0;
 }
 
@@ -1220,6 +1230,10 @@ static int kbl_init_workarounds(struct intel_engine_cs *engine)
 		GEN7_HALF_SLICE_CHICKEN1,
 		GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE);
 
+	/* WaInPlaceDecompressionHang:kbl */
+	WA_SET_BIT(GEN9_GAMT_ECO_REG_RW_IA,
+		   GAMT_ECO_ENABLE_IN_PLACE_DECOMPRESS);
+
 	/* WaDisableLSQCROPERFforOCL:kbl */
 	ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
 	if (ret)
-- 
2.7.4