drm/rockchip: add hdmi 4k@50hz/60hz mode rate

add 594Mhz hdmi rate to enable 4k@50hz/60hz

Change-Id: I08374e54f7a016385d753dc4e6586b189371ce70
Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>

Author: yueshu

drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c

@@ -88,6 +88,7 @@ static const int dw_hdmi_rates[] = {
 	154000000,
 	162000000,
 	297000000,
+	594000000,
 };
 
 /*
@@ -216,7 +217,8 @@ static const struct dw_hdmi_phy_config rockchip_phy_config[] = {
 	/*pixelclk   symbol   term   vlev*/
 	{ 74250000,  0x8009, 0x0004, 0x0272},
 	{ 165000000, 0x802b, 0x0004, 0x0209},
-	{ 297000000, 0x802d, 0x0001, 0x0149},
+	{ 297000000, 0x8039, 0x0000, 0x0149},
+	{ 594000000, 0x8039, 0x0000, 0x019d},
 	{ ~0UL,	     0x0000, 0x0000, 0x0000}
 };