From: Mika Kuoppala Date: Tue, 7 Jun 2016 14:18:53 +0000 (+0300) Subject: drm/i915/skl: Add WaDisableGafsUnitClkGating X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=eee8efb02a0f9284d85e6b3688f944ca765d7ad3;p=linux-beck.git drm/i915/skl: Add WaDisableGafsUnitClkGating We need to disable clock gating in this unit to work around hardware issue causing possible corruption/hang. v2: name the bit (Ville) v3: leave the fix enabled for 2227050 and set correct bit (Matthew) References: HSD#2227156, HSD#2227050 Cc: Ville Syrjälä Cc: Matthew Auld Reviewed-by: Matthew Auld Signed-off-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-2-git-send-email-mika.kuoppala@intel.com --- diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 04a3fd277ab3..4ea2253423dc 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -6948,6 +6948,7 @@ enum skl_disp_power_wells { #define GEN7_UCGCTL4 _MMIO(0x940c) #define GEN7_L3BANK2X_CLOCK_GATE_DISABLE (1<<25) +#define GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE (1<<14) #define GEN6_RCGCTL1 _MMIO(0x9410) #define GEN6_RCGCTL2 _MMIO(0x9414) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index f6e6128b36ca..16e87a828643 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1118,6 +1118,9 @@ static int skl_init_workarounds(struct intel_engine_cs *engine) GEN7_HALF_SLICE_CHICKEN1, GEN7_SBE_SS_CACHE_DISPATCH_PORT_SHARING_DISABLE); + /* WaDisableGafsUnitClkGating:skl */ + WA_SET_BIT(GEN7_UCGCTL4, GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE); + /* WaDisableLSQCROPERFforOCL:skl */ ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4); if (ret)