[Intel-gfx] [PATCH 5/5] drm/i915: Setup static bias for GPU

[deepak . s]

From: Deepak S 

Based on the spec, Setting up static BIAS for GPU to improve the
rps performace.

Signed-off-by: Deepak S 
---
 drivers/gpu/drm/i915/i915_reg.h |  5 +
 drivers/gpu/drm/i915/intel_pm.c | 12 
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 55143cb..dd776df 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -662,6 +662,11 @@ enum skl_disp_power_wells {
 #define   FB_FMAX_VMIN_FREQ_LO_SHIFT   27
 #define   FB_FMAX_VMIN_FREQ_LO_MASK0xf800
 
+#define VLV_IOSFB_RPS_OVERRIDE 0x04
+#define VLV_OVERRIDE_RPS_MASK  1
+#define VLV_ENABLE_BIAS_SHARE  (1 << 1)
+#define VLV_BIAS_VAL   (6 << 2)
+
 #define VLV_CZ_CLOCK_TO_MILLI_SEC  10
 #define VLV_RP_UP_EI_THRESHOLD 90
 #define VLV_RP_DOWN_EI_THRESHOLD   70
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7716be9..5bbb047 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4841,6 +4841,12 @@ static void cherryview_enable_rps(struct drm_device *dev)
   GEN6_RP_UP_BUSY_AVG |
   GEN6_RP_DOWN_IDLE_AVG);
 
+   /* Setting Fixed Bias */
+   val = VLV_OVERRIDE_RPS_MASK |
+ VLV_ENABLE_BIAS_SHARE |
+ VLV_BIAS_VAL;
+   vlv_punit_write(dev_priv, VLV_IOSFB_RPS_OVERRIDE, val);
+
val = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
 
/* RPS code assumes GPLL is used */
@@ -4951,6 +4957,12 @@ static void valleyview_enable_rps(struct drm_device *dev)
 
I915_WRITE(GEN6_RC_CONTROL, rc6_mode);
 
+   /* Setting Fixed Bias */
+   val = VLV_OVERRIDE_RPS_MASK |
+ VLV_ENABLE_BIAS_SHARE |
+ VLV_BIAS_VAL;
+   vlv_punit_write(dev_priv, VLV_IOSFB_RPS_OVERRIDE, val);
+
val = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
 
/* RPS code assumes GPLL is used */
-- 
1.9.1

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Re: [Intel-gfx] [PATCH 5/5] drm/i915: Setup static bias for GPU

[shuang . he]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: 
shuang...@intel.com)
Task id: 5840
-Summary-
Platform  Delta  drm-intel-nightly  Series Applied
PNV  282/282  282/282
ILK  308/308  308/308
SNB  326/326  326/326
IVB  379/379  379/379
BYT  294/294  294/294
HSW -1  387/387  386/387
BDW -1  316/316  315/316
-Detailed-
Platform  Testdrm-intel-nightly  Series 
Applied
*HSW  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance  PASS(2) 
 DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog  PASS(15)  DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'
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