On 4/21/2016 12:23 PM, tim.gore@xxxxxxxxx wrote:
From: Tim Gore <tim.gore@xxxxxxxxx>
This patch applies a performance enhancement workaround
based on analysis of DX and OCL S-Curve workloads. We
increase the General Priority Credits for L3SQ from the
hardware default of 56 to the max value 62, and decrease
the High Priority credits from 8 to 2.
v2: Only apply to B0 onwards
v3: Move w/a to per engine init, ie bxt_init_workarounds
Signed-off-by: Tim Gore <tim.gore@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_ringbuffer.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c21b71c..efd36c3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6074,6 +6074,7 @@ enum skl_disp_power_wells {
#define GEN8_L3SQCREG1 _MMIO(0xB100)
#define BDW_WA_L3SQCREG1_DEFAULT 0x784000
+#define BXT_WA_L3SQCREG1_DEFAULT 0xF84000
#define GEN7_L3CNTLREG1 _MMIO(0xB01C)
#define GEN7_WA_FOR_GEN7_L3_CONTROL 0x3C47FF8C
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 245386e..f6e8e7e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1180,6 +1180,10 @@ static int bxt_init_workarounds(struct intel_engine_cs *engine)
return ret;
}
+ /* WaProgramL3SqcReg1DefaultForPerf:bxt */
+ if (IS_BXT_REVID(dev, BXT_REVID_B0, REVID_FOREVER))
+ I915_WRITE(GEN8_L3SQCREG1, BXT_WA_L3SQCREG1_DEFAULT);
+
return 0;
}
lgtm,
Reviewed-by: Michel Thierry <michel.thierry@xxxxxxxxx>
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