From 61bf9719fa170cd73b1937770d08cb062e070958 Mon Sep 17 00:00:00 2001 From: Mika Kuoppala Date: Thu, 12 Apr 2018 17:58:02 +0300 Subject: 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 Cc: Rafael Antognolli Cc: Rodrigo Vivi Signed-off-by: Mika Kuoppala Acked-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20180412145802.23313-1-mika.kuoppala@linux.intel.com --- drivers/gpu/drm/i915/intel_engine_cs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index 68898d58dd1e..1a8370779bbb 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -475,6 +475,9 @@ static bool csb_force_mmio(struct drm_i915_private *i915) if (intel_vgpu_active(i915) && !intel_vgpu_has_hwsp_emulation(i915)) return true; + if (IS_CANNONLAKE(i915)) + return true; + return false; } -- cgit v1.2.3-59-g8ed1b