From a786d53a2cf14f2c7abb6731f530aef1a8a1086a Mon Sep 17 00:00:00 2001 From: Arun Siluvery Date: Thu, 21 Jan 2016 21:43:51 +0000 Subject: [PATCH] drm/i915/bxt: Add GEN8_L3SQCREG4 to HW whitelist Required for WaDisableLSQCROPERFforOCL:bxt According to WA database these are only applicable for BXT:A0 but since A0 and A1 shares the same GT these are extended for A1 as well. This register is added to HW whitelist to support WA required for future enabling of pre-emptive command execution, WA implementation will be in userspace and it cannot program this register if it is not on HW whitelist. v2: explain purpose of changes (Chris) Reviewed-by: Nick Hoath Signed-off-by: Arun Siluvery Link: http://patchwork.freedesktop.org/patch/msgid/1453412634-29238-6-git-send-email-arun.siluvery@linux.intel.com Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index a99f8340fb47..12eb1e0f786b 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1136,10 +1136,15 @@ static int bxt_init_workarounds(struct intel_engine_cs *ring) /* WaDisableObjectLevelPreemptionForTrifanOrPolygon:bxt */ /* WaDisableObjectLevelPreemptionForInstancedDraw:bxt */ /* WaDisableObjectLevelPreemtionForInstanceId:bxt */ + /* WaDisableLSQCROPERFforOCL:bxt */ if (IS_BXT_REVID(dev, 0, BXT_REVID_A1)) { ret = wa_ring_whitelist_reg(ring, GEN9_CS_DEBUG_MODE1); if (ret) return ret; + + ret = wa_ring_whitelist_reg(ring, GEN8_L3SQCREG4); + if (ret) + return ret; } return 0; -- 2.39.5