drm: bridge: dw-hdmi: support workaround to clear the overflow condit…

…ion on rockchip platform

Under some circumstances the Frame Composer arithmetic unit can miss
an FC register write due to being busy processing the previous one.

The issue can be worked around by issuing a TMDS software reset and
then write one of the FC registers several times. After tested, the
number of iterations of RK3399/RK3328(v2.11a), RK3368(v2.01a),
RK3288(v2.00a) is one.

Change-Id: Iba209e25d56aff84a8cc90b4d8dcb87369c9ae52
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>

drivers/gpu/drm/bridge/dw-hdmi.c

@@ -1963,6 +1963,9 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 		count = 4;
 		break;
 	case 0x131a:
+	case 0x200a:
+	case 0x201a:
+	case 0x211a:
 		count = 1;
 		break;
 	default: