drm/rockchip: inno_hdmi: fix phy pre-emphasis and driver setting

Accdording to CTS test result, for tmds clk rate above 140M,
RK3036 pre-emphasis should be 6 and driver is 0xb.

Change-Id: I7d4fed308a200eb4da4af1514c34c0501f551126
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>

Author: Zheng Yang

drivers/gpu/drm/rockchip/inno_hdmi.c

@@ -211,11 +211,16 @@ static void inno_hdmi_sys_power(struct inno_hdmi *hdmi, bool enable)
 
 static void inno_hdmi_set_pwr_mode(struct inno_hdmi *hdmi, int mode)
 {
+	u8 value;
+
 	switch (mode) {
 	case NORMAL:
 		inno_hdmi_sys_power(hdmi, false);
-
-		hdmi_writeb(hdmi, HDMI_PHY_PRE_EMPHASIS, 0x6f);
+		if (hdmi->tmds_rate > 140000000)
+			value = 0x6f;
+		else
+			value = 0x3f;
+		hdmi_writeb(hdmi, HDMI_PHY_PRE_EMPHASIS, value);
 		hdmi_writeb(hdmi, HDMI_PHY_DRIVER, 0xbb);
 
 		hdmi_writeb(hdmi, HDMI_PHY_SYS_CTL, 0x15);