drm: bridge: analogix/dp: remove duplicate configuration of link rate and link count

link_rate and lane_count already configured in analogix_dp_set_link_train(),
so we don't need to config those repeatly after training finished, just
remove them out.

Beside Display Port 1.2 already support 5.4Gbps link rate, the maximum sets
would change from {1.62Gbps, 2.7Gbps} to {1.62Gbps, 2.7Gbps, 5.4Gbps}.
Tested-by: Caesar Wang <wxt@rock-chips.com>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>

drivers/gpu/drm/bridge/analogix/analogix_dp_core.c

@@ -627,6 +627,8 @@ static void analogix_dp_get_max_rx_bandwidth(struct analogix_dp_device *dp,
 	/*
 	 * For DP rev.1.1, Maximum link rate of Main Link lanes
 	 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
+	 * For DP rev.1.2, Maximum link rate of Main Link lanes
+	 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps, 0x14 = 5.4Gbps
 	 */
 	analogix_dp_read_byte_from_dpcd(dp, DP_MAX_LINK_RATE, &data);
 	*bandwidth = data;
@@ -647,7 +649,7 @@ static void analogix_dp_get_max_rx_lane_count(struct analogix_dp_device *dp,
 
 static void analogix_dp_init_training(struct analogix_dp_device *dp,
 				      enum link_lane_count_type max_lane,
-				      enum link_rate_type max_rate)
+				      int max_rate)
 {
 	/*
 	 * MACRO_RST must be applied after the PLL_LOCK to avoid
@@ -659,11 +661,12 @@ static void analogix_dp_init_training(struct analogix_dp_device *dp,
 	analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
 	analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
 
-	if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
-	    (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
+	if ((dp->link_train.link_rate != DP_LINK_BW_1_62) &&
+	    (dp->link_train.link_rate != DP_LINK_BW_2_7) &&
+	    (dp->link_train.link_rate != DP_LINK_BW_5_4)) {
 		dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
 			dp->link_train.link_rate);
-		dp->link_train.link_rate = LINK_RATE_1_62GBPS;
+		dp->link_train.link_rate = DP_LINK_BW_1_62;
 	}
 
 	if (dp->link_train.lane_count == 0) {
@@ -901,9 +904,6 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
 	analogix_dp_enable_rx_to_enhanced_mode(dp, 1);
 	analogix_dp_enable_enhanced_mode(dp, 1);
 
-	analogix_dp_set_lane_count(dp, dp->video_info->lane_count);
-	analogix_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
-
 	analogix_dp_init_video(dp);
 	ret = analogix_dp_config_video(dp);
 	if (ret)

drivers/gpu/drm/bridge/analogix/analogix_dp_core.h

@@ -20,11 +20,6 @@
 #define MAX_CR_LOOP 5
 #define MAX_EQ_LOOP 5
 
-enum link_rate_type {
-	LINK_RATE_1_62GBPS = 0x06,
-	LINK_RATE_2_70GBPS = 0x0a
-};
-
 enum link_lane_count_type {
 	LANE_COUNT1 = 1,
 	LANE_COUNT2 = 2,
@@ -128,7 +123,7 @@ struct video_info {
 	enum color_coefficient ycbcr_coeff;
 	enum color_depth color_depth;
 
-	enum link_rate_type link_rate;
+	int link_rate;
 	enum link_lane_count_type lane_count;
 };
 

drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c

@@ -855,7 +855,7 @@ void analogix_dp_set_link_bandwidth(struct analogix_dp_device *dp, u32 bwtype)
 	u32 reg;
 
 	reg = bwtype;
-	if ((bwtype == LINK_RATE_2_70GBPS) || (bwtype == LINK_RATE_1_62GBPS))
+	if ((bwtype == DP_LINK_BW_2_7) || (bwtype == DP_LINK_BW_1_62))
 		writel(reg, dp->reg_base + ANALOGIX_DP_LINK_BW_SET);
 }