From 245d96670d2655f70f4445d5247f26afbe705c84 Mon Sep 17 00:00:00 2001
From: Arun Siluvery <arun.siluvery@linux.intel.com>
Date: Mon, 3 Aug 2015 20:24:56 +0100
Subject: [PATCH] drm/i915:skl: Add WaEnableGapsTsvCreditFix
Cc: Ben Widawsky <benjamin.widawsky@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Tested-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90854
Tested-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8cf77568f7e14..0f67f3da0762a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6851,6 +6851,9 @@ enum skl_disp_power_wells {
#define GEN7_MISCCPCTL (0x9424)
#define GEN7_DOP_CLOCK_GATE_ENABLE (1<<0)
+#define GEN8_GARBCNTL 0xB004
+#define GEN9_GAPS_TSV_CREDIT_DISABLE (1<<7)
+
/* IVYBRIDGE DPF */
#define GEN7_L3CDERRST1 0xB008 /* L3CD Error Status 1 */
#define HSW_L3CDERRST11 0xB208 /* L3CD Error Status register 1 slice 1 */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a1d92b7f3e356..f7f01dc05c4e6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -102,6 +102,12 @@ static void skl_init_clock_gating(struct drm_device *dev)
/* WaDisableLSQCROPERFforOCL:skl */
I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
GEN8_LQSC_RO_PERF_DIS);
+
+ /* WaEnableGapsTsvCreditFix:skl */
+ if (IS_SKYLAKE(dev) && (INTEL_REVID(dev) >= SKL_REVID_C0)) {
+ I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
+ GEN9_GAPS_TSV_CREDIT_DISABLE));
+ }
}
static void bxt_init_clock_gating(struct drm_device *dev)
--
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