[PATCH 4/5] drm/i915/gvt: Fix port number for BDW on EDID region setup

[Colin Xu]

From: Zhenyu Wang <zhenyuw at linux.intel.com>

commit 28284943ac94014767ecc2f7b3c5747c4a5617a0 upstream

Current BDW virtual display port is initialized as PORT_B, so need
to use same port for VFIO EDID region, otherwise invalid EDID blob
pointer is assigned which caused kernel null pointer reference. We
might evaluate actual display hotplug for BDW to make this function
work as expected, anyway this is always required to be fixed first.

Reported-by: Alejandro Sior <aho at sior.be>
Cc: Alejandro Sior <aho at sior.be>
Fixes: 0178f4ce3c3b ("drm/i915/gvt: Enable vfio edid for all GVT supported platform")
Reviewed-by: Hang Yuan <hang.yuan at intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200914030302.2775505-1-zhenyuw@linux.intel.com
(cherry picked from commit 28284943ac94014767ecc2f7b3c5747c4a5617a0)
Signed-off-by: Colin Xu <colin.xu at intel.com>
Cc: <stable at vger.kernel.org> # 5.4.y
---
 drivers/gpu/drm/i915/gvt/vgpu.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index 32e57635709a..4daaf302f429 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -432,8 +432,9 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
 	if (ret)
 		goto out_clean_sched_policy;
 
-	/*TODO: add more platforms support */
-	if (IS_SKYLAKE(gvt->dev_priv) || IS_KABYLAKE(gvt->dev_priv))
+	if (IS_BROADWELL(gvt->dev_priv))
+		ret = intel_gvt_hypervisor_set_edid(vgpu, PORT_B);
+	else
 		ret = intel_gvt_hypervisor_set_edid(vgpu, PORT_D);
 	if (ret)
 		goto out_clean_sched_policy;
-- 
2.30.2