From db099c8f963fe656108e0a068274c5580a17f69b Mon Sep 17 00:00:00 2001
From: Eugeni Dodonov <eugeni.dodonov@intel.com>
Date: Wed, 8 Feb 2012 12:53:51 -0800
Subject: [PATCH] drm/i915: gen7: work around a system hang on IVB
This adds the workaround for WaCatErrorRejectionIssue which could result
in a system hang.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=41353
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44610
Tested-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
drivers/gpu/drm/i915/i915_reg.h | 4 ++++
drivers/gpu/drm/i915/intel_display.c | 5 +++++
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ca4737e5cdfde..4e1ee909a80bc 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3035,6 +3035,10 @@
#define GEN7_L3_CHICKEN_MODE_REGISTER 0xB030
#define GEN7_WA_L3_CHICKEN_MODE 0x20000000
+/* WaCatErrorRejectionIssue */
+#define GEN7_SQ_CHICKEN_MBCUNIT_CONFIG 0x9030
+#define GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB (1<<11)
+
/* PCH */
/* south display engine interrupt */
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 928840aaeb064..a5276150b8f8e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8478,6 +8478,11 @@ static void ivybridge_init_clock_gating(struct drm_device *dev)
I915_WRITE(GEN7_L3_CHICKEN_MODE_REGISTER,
GEN7_WA_L3_CHICKEN_MODE);
+ /* This is required by WaCatErrorRejectionIssue */
+ I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
+ I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) |
+ GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
+
for_each_pipe(pipe) {
I915_WRITE(DSPCNTR(pipe),
I915_READ(DSPCNTR(pipe)) |
--
2.30.2