From: Imre Deak <imre.deak@intel.com>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH 1/4] drm/i915/bdw: Add missing delay during L3 SQC credit programming
Date: Mon, 25 Apr 2016 15:38:05 +0300 [thread overview]
Message-ID: <1461587888-5047-1-git-send-email-imre.deak@intel.com> (raw)
BSpec requires us to wait ~100 clocks before re-enabling clock gating,
so make sure we do this.
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 702f683..a6fd4dd 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6711,6 +6711,12 @@ static void broadwell_init_clock_gating(struct drm_device *dev)
misccpctl = I915_READ(GEN7_MISCCPCTL);
I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
I915_WRITE(GEN8_L3SQCREG1, BDW_WA_L3SQCREG1_DEFAULT);
+ /*
+ * Wait at least 100 clocks before re-enabling clock gating. See
+ * the definition of L3SQCREG1 in BSpec.
+ */
+ POSTING_READ(GEN8_L3SQCREG1);
+ udelay(1);
I915_WRITE(GEN7_MISCCPCTL, misccpctl);
/*
--
2.5.0
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next reply other threads:[~2016-04-25 12:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-25 12:38 Imre Deak [this message]
2016-04-25 12:38 ` [PATCH 2/4] drm/i915: Clean up L3 SQC register field definitions Imre Deak
2016-04-26 8:11 ` Mika Kuoppala
2016-04-26 9:03 ` Imre Deak
2016-04-26 9:21 ` Imre Deak
2016-04-26 16:55 ` Ville Syrjälä
2016-04-25 12:38 ` [PATCH 3/4] drm/i915/chv: Tune L3 SQC credits based on actual latencies Imre Deak
2016-04-25 13:16 ` Ville Syrjälä
2016-04-26 16:19 ` Ville Syrjälä
2016-04-26 16:39 ` [PATCH v2 " Imre Deak
2016-04-26 16:51 ` Ville Syrjälä
2016-04-25 12:38 ` [PATCH 4/4] drm/i915/bxt: " Imre Deak
2016-04-26 16:41 ` [PATCH v2 " Imre Deak
2016-04-26 16:53 ` Ville Syrjälä
2016-04-25 14:03 ` ✗ Fi.CI.BAT: failure for series starting with [1/4] drm/i915/bdw: Add missing delay during L3 SQC credit programming Patchwork
2016-04-26 16:55 ` [PATCH 1/4] " Ville Syrjälä
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