[PATCH/V2] drm/i915/gvt: make dpcd_fix_data supports DP1.2

[Pei Zhang]

This patch is ported from staging branch. Origianl commit as below:

GVT-g will emulate a fixed DPCD data to VM for DP/eDP panel. Update
this data to latest DP1.2 with the maximum lane bandwidth of 5.4G/s
to support 4K resolution in VM.

V2: add inline comment to describe the dpcd_fix_data.

Signed-off-by: Pei Zhang <pei.zhang at intel.com>
Reviewd-by: Zhenyu Wang <zhenyuw at linux.intel.com>
---
 drivers/gpu/drm/i915/gvt/display.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
index 5419ae6..c60c370 100644
--- a/drivers/gpu/drm/i915/gvt/display.c
+++ b/drivers/gpu/drm/i915/gvt/display.c
@@ -161,8 +161,9 @@ static unsigned char virtual_dp_monitor_edid[GVT_EDID_NUM][EDID_SIZE] = {
 
 #define DPCD_HEADER_SIZE        0xb
 
+/* let the virtual display supports DP1.2 */
 static u8 dpcd_fix_data[DPCD_HEADER_SIZE] = {
-	0x11, 0x0a, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+	0x12, 0x014, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 };
 
 static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
-- 
2.7.4