drm/i915/gvt: update misc ctl regs base on stepping info

Misc ctl related registers are for WA purpose, should detect the
stepping info first before updating HW value.

Signed-off-by: Ping Gao <ping.a.gao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 2d97fb7..bb45d5d 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -1278,19 +1278,20 @@ static int skl_misc_ctl_write(struct intel_vgpu *vgpu, unsigned int offset,
        switch (offset) {
        case 0x4ddc:
                vgpu_vreg(vgpu, offset) = 0x8000003c;
+               /* WaCompressedResourceSamplerPbeMediaNewHashMode:skl */
+               if (IS_SKL_REVID(dev_priv, SKL_REVID_C0, REVID_FOREVER))
+                       I915_WRITE(reg, vgpu_vreg(vgpu, offset));
                break;
        case 0x42080:
                vgpu_vreg(vgpu, offset) = 0x8000;
+               /* WaCompressedResourceDisplayNewHashMode:skl */
+               if (IS_SKL_REVID(dev_priv, SKL_REVID_E0, REVID_FOREVER))
+                       I915_WRITE(reg, vgpu_vreg(vgpu, offset));
                break;
        default:
                return -EINVAL;
        }
 
-       /**
-        * TODO: need detect stepping info after gvt contain such information
-        * 0x4ddc enabled after C0, 0x42080 enabled after E0.
-        */
-       I915_WRITE(reg, vgpu_vreg(vgpu, offset));
        return 0;
 }