On 4/20/2016 3:23 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.
v2: Only apply to B0 onwards
Signed-off-by: Tim Gore <tim.gore@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_pm.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 f0a6d85..13e154a 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_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b7c2186..eecdc3a6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -76,6 +76,10 @@ static void bxt_init_clock_gating(struct drm_device *dev)
if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER))
I915_WRITE(GEN9_CLKGATE_DIS_0, I915_READ(GEN9_CLKGATE_DIS_0) |
PWM1_GATING_DIS | PWM2_GATING_DIS);
+
+ /* WaProgramL3SqcReg1DefaultForPerf:bxt */
+ if (IS_BXT_REVID(dev, BXT_REVID_B0, REVID_FOREVER))
+ I915_WRITE(GEN8_L3SQCREG1, BXT_WA_L3SQCREG1_DEFAULT);
}
static void i915_pineview_get_mem_freq(struct drm_device *dev)
Isnt it better to add this to bxt_init_workarounds() instead of
bxt_init_clock_gating()?
And It doesnt hurt to put what it is doing in the commit msg, i.e.:
"Increasing GP credits to 62 (from default 56), and reducing HP credits
to 2 (from default 8)"
-Michel
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