Watermark calculations depend on the intel_crtc->active flag to be set
properly. Suspend/resume is broken on SKL and we also get DDB mismatches
without this patch.
The regression was introduced in:
commit eddfcbcdc27fbecb33bff098967bbdd7ca75bfa6
Author: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Date: Mon Jun 15 12:33:53 2015 +0200
drm/i915: Update less state during modeset.
No need to repeatedly call update_watermarks, or update_fbc.
Down to a single call to update_watermarks in .crtc_enable
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
Tested-by(IVB): Matt Roper <matthew.d.roper@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Patrik Jakobsson <patrik.jakobsson@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 99bf147..ffd2c96 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5046,6 +5046,10 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
ironlake_fdi_pll_disable(intel_crtc);
}
+
+ intel_crtc->active = false;
+ intel_update_watermarks(crtc);
+ intel_disable_shared_dpll(intel_crtc);
}
static void haswell_crtc_disable(struct drm_crtc *crtc)
@@ -5091,6 +5095,10 @@ static void haswell_crtc_disable(struct drm_crtc *crtc)
for_each_encoder_on_crtc(dev, crtc, encoder)
if (encoder->post_disable)
encoder->post_disable(encoder);
+
+ intel_crtc->active = false;
+ intel_update_watermarks(crtc);
+ intel_disable_shared_dpll(intel_crtc);
}
static void i9xx_pfit_enable(struct intel_crtc *crtc)
@@ -6155,6 +6163,9 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
if (!IS_GEN2(dev))
intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
+
+ intel_crtc->active = false;
+ intel_update_watermarks(crtc);
}
static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
--
2.1.4
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