From: Chandra Konduru <chandra.kond...@intel.com>
Display WA #0827:
Switching the plane format from NV12 to RGB and leaving system idle results
in display underrun and corruption. WA: Set the bit 15 & bit 19 to 1b
in the CLKGATE_DIS_PSL register for the pipe in which NV12 plane is enabled.
Signed-off-by: Chandra Konduru <chandra.kond...@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srini...@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_display.c | 16 ++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8f36023..c4af05e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3822,6 +3822,9 @@ enum {
#define _CLKGATE_DIS_PSL_A 0x46520
#define _CLKGATE_DIS_PSL_B 0x46524
#define _CLKGATE_DIS_PSL_C 0x46528
+#define DUPS1_GATING_DIS (1 << 15)
+#define DUPS2_GATING_DIS (1 << 19)
+#define DUPS3_GATING_DIS (1 << 23)
#define DPF_GATING_DIS (1 << 10)
#define DPF_RAM_GATING_DIS (1 << 9)
#define DPFR_GATING_DIS (1 << 8)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 551c970..94faf3e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5495,6 +5495,20 @@ static void glk_pipe_scaler_clock_gating_wa(struct
drm_i915_private *dev_priv,
I915_WRITE(CLKGATE_DIS_PSL(pipe), val);
}
+static void skl_wa_clkgate(struct drm_i915_private *dev_priv,
+ int pipe, int enable)
+{
+ if (pipe == PIPE_A || pipe == PIPE_B) {
+ if (enable)
+ I915_WRITE(CLKGATE_DIS_PSL(pipe),
+ DUPS1_GATING_DIS | DUPS2_GATING_DIS);
+ else
+ I915_WRITE(CLKGATE_DIS_PSL(pipe),
+ I915_READ(CLKGATE_DIS_PSL(pipe)) &
+ ~(DUPS1_GATING_DIS|DUPS2_GATING_DIS));
+ }
+}
+
static void haswell_crtc_enable(struct intel_crtc_state *pipe_config,
struct drm_atomic_state *old_state)
{
@@ -5599,6 +5613,7 @@ static void haswell_crtc_enable(struct intel_crtc_state
*pipe_config,
intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
intel_wait_for_vblank(dev_priv, hsw_workaround_pipe);
}
+ skl_wa_clkgate(dev_priv, pipe, 1);
}
static void ironlake_pfit_disable(struct intel_crtc *crtc, bool force)
@@ -5709,6 +5724,7 @@ static void haswell_crtc_disable(struct intel_crtc_state
*old_crtc_state,
intel_ddi_disable_pipe_clock(intel_crtc->config);
intel_encoders_post_disable(crtc, old_crtc_state, old_state);
+ skl_wa_clkgate(dev_priv, intel_crtc->pipe, 0);
}
static void i9xx_pfit_enable(struct intel_crtc *crtc)
--
1.9.1
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