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drm/i915/cnl: Use mmio access to context status buffer
Evidence indicates that Cannonlake HWSP is not coherent as it should. Revert to using mmio access for now. Testcase: igt/gem_ctx_switch References: https://bugs.freedesktop.org/show_bug.cgi?id=105888 Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Rafael Antognolli <rafael.antognolli@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20180412145802.23313-1-mika.kuoppala@linux.intel.com
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@ -475,6 +475,9 @@ static bool csb_force_mmio(struct drm_i915_private *i915)
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if (intel_vgpu_active(i915) && !intel_vgpu_has_hwsp_emulation(i915))
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return true;
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if (IS_CANNONLAKE(i915))
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return true;
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return false;
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}
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