The patch below does not apply to the 4.8-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 4ba9c1f7c7b8ca8c1d77f65d408e589dc87b9a2d Mon Sep 17 00:00:00 2001
From: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Date: Wed, 20 Jul 2016 14:26:12 +0300
Subject: [PATCH] drm/i915/gen9: Add WaInPlaceDecompressionHang
Add this workaround to prevent hang when in place compression
is used.
References: HSD#2135774
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Reviewed-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0f408ada1c65..c97724d380d3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2629,6 +2629,8 @@ 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 b844e6984ae7..502bd7c2c32b 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)
--
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