Set bit 8 in 0x43224 to prevent screen corruption and system
hangs on high memory bandwidth conditions. The same wa also suggest
setting bit 31 on ARB_CTL. According to another workaround we gain
better idle power savings when FBC is enabled.
References: HSD#2137218, HSD#2227171, HSD#2136579
Cc: Paulo Zanoni <paulo.r.zan...@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuopp...@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 2 ++
drivers/gpu/drm/i915/intel_pm.c | 8 ++++++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 280d2137f90f..2f3a3960f5f7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2208,6 +2208,7 @@ enum skl_disp_power_wells {
#define ILK_DPFC_STATUS _MMIO(0x43210)
#define ILK_DPFC_FENCE_YOFF _MMIO(0x43218)
#define ILK_DPFC_CHICKEN _MMIO(0x43224)
+#define ILK_DPFC_DISABLE_DUMMY0 (1<<8)
#define ILK_FBC_RT_BASE _MMIO(0x2128)
#define ILK_FBC_RT_VALID (1<<0)
#define SNB_FBC_FRONT_BUFFER (1<<1)
@@ -6053,6 +6054,7 @@ enum skl_disp_power_wells {
#define CHICKEN_PIPESL_1(pipe) _MMIO_PIPE(pipe, _CHICKEN_PIPESL_1_A,
_CHICKEN_PIPESL_1_B)
#define DISP_ARB_CTL _MMIO(0x45000)
+#define DISP_FBC_MEMORY_WAKE (1<<31)
#define DISP_TILE_SURFACE_SWIZZLING (1<<13)
#define DISP_FBC_WM_DIS (1<<15)
#define DISP_ARB_CTL2 _MMIO(0x45004)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 62734a16e873..6bd73fb5c4bb 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -68,8 +68,12 @@ static void gen9_init_clock_gating(struct drm_device *dev)
I915_WRITE(GEN8_CHICKEN_DCPR_1,
I915_READ(GEN8_CHICKEN_DCPR_1) | MASK_WAKEMEM);
- I915_WRITE(DISP_ARB_CTL,
- I915_READ(DISP_ARB_CTL) | DISP_FBC_WM_DIS);
+ I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
+ DISP_FBC_WM_DIS |
+ DISP_FBC_MEMORY_WAKE);
+
+ I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) |
+ ILK_DPFC_DISABLE_DUMMY0);
}
static void bxt_init_clock_gating(struct drm_device *dev)
--
2.5.0
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