drm/i915/kbl: 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) v4: Split out the skl part in separate commit for easier backport References: HSD#2227156, HSD#2227050 Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Matthew Auld <matthew.william.auld@gmail.com> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-20-git-send-email-mika.kuoppala@intel.com
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@ -1227,6 +1227,9 @@ static int kbl_init_workarounds(struct intel_engine_cs *engine)
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WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
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GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
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/* WaDisableGafsUnitClkGating:kbl */
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WA_SET_BIT(GEN7_UCGCTL4, GEN8_EU_GAUNIT_CLOCK_GATE_DISABLE);
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/* WaDisableLSQCROPERFforOCL:kbl */
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ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
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if (ret)
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