drm/i915/gvt: Add GEN9_CLKGATE_DIS_4 to default BXT mmio handler

coxuintel · zhenyw · commit d817de3bc186 · 2018-09-18T10:37:44.000+08:00
Host prints lots of untracked MMIO at 0x4653c when creating linux guest.
"gvt: vgpu 2: untracked MMIO 0004653c len 4"

GEN9_CLKGATE_DIS_4 (0x4653c) is accessed by i915 for gmbus clockgating.
However vgpu doesn't support any clockgating powergating operations
on related mmio access trap so need add it to default handler.
GEN9_CLKGATE_DIS_4 is accessed in bxt_gmbus_clock_gating() which only
applies to GEN9_LP so doens't show the warning on other platforms.

The solution is to add it to default handler init_bxt_mmio_info().

Reviewed-by: He, Min &lt;min.he@intel.com&gt;
Signed-off-by: Colin Xu &lt;colin.xu@intel.com&gt;
Signed-off-by: Zhenyu Wang &lt;zhenyuw@linux.intel.com&gt;
diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -3210,6 +3210,7 @@ static int init_bxt_mmio_info(struct intel_gvt *gvt)
 	MMIO_D(BXT_DSI_PLL_ENABLE, D_BXT);
 
 	MMIO_D(GEN9_CLKGATE_DIS_0, D_BXT);
+	MMIO_D(GEN9_CLKGATE_DIS_4, D_BXT);
 
 	MMIO_D(HSW_TVIDEO_DIP_GCP(TRANSCODER_A), D_BXT);
 	MMIO_D(HSW_TVIDEO_DIP_GCP(TRANSCODER_B), D_BXT);
