From f98edb2b6f6baffe0d2be66ebe761b51486c6a40 Mon Sep 17 00:00:00 2001 From: "arun.siluvery@linux.intel.com" Date: Mon, 6 Jun 2016 09:52:49 +0100 Subject: [PATCH] drm/i915/gen9: Add WaVFEStateAfterPipeControlwithMediaStateClear Kernel only need to add a register to HW whitelist, required for a preemption related issue. Reference: HSD#2131039 Reviewed-by: Jeff McGee Signed-off-by: Arun Siluvery Signed-off-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/1465203169-16591-1-git-send-email-arun.siluvery@linux.intel.com (cherry picked from commit 6bb6285582e0cf9b3a8440e0e714aae5f66d9ce2) Signed-off-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index bb43bb1..7b47504 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -6070,6 +6070,7 @@ enum skl_disp_power_wells { #define GEN9_TSG_BARRIER_ACK_DISABLE (1<<8) #define GEN9_CS_DEBUG_MODE1 _MMIO(0x20ec) +#define GEN9_CTX_PREEMPT_REG _MMIO(0x2248) #define GEN8_CS_CHICKEN1 _MMIO(0x2580) /* GEN7 chicken */ diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 04402bb..d812501 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -992,6 +992,11 @@ static int gen9_init_workarounds(struct intel_engine_cs *engine) I915_WRITE(GEN8_L3SQCREG4, (I915_READ(GEN8_L3SQCREG4) | GEN8_LQSC_FLUSH_COHERENT_LINES)); + /* WaVFEStateAfterPipeControlwithMediaStateClear:skl,bxt */ + ret = wa_ring_whitelist_reg(engine, GEN9_CTX_PREEMPT_REG); + if (ret) + return ret; + /* WaEnablePreemptionGranularityControlByUMD:skl,bxt */ ret= wa_ring_whitelist_reg(engine, GEN8_CS_CHICKEN1); if (ret) -- 2.7.4