drm/rockchip: Avoid drm_dp_link helpers

During the discussion of patches that enhance the drm_dp_link helpers it
was concluded that these helpers aren't very useful to begin with. Start
pushing the equivalent code into individual drivers to ultimately remove
them.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191021143437.1477719-13-thierry.reding@gmail.com

drivers/gpu/drm/rockchip/cdn-dp-core.c

@@ -477,8 +477,8 @@ static int cdn_dp_disable(struct cdn_dp_device *dp)
 	cdn_dp_set_firmware_active(dp, false);
 	cdn_dp_clk_disable(dp);
 	dp->active = false;
-	dp->link.rate = 0;
-	dp->link.num_lanes = 0;
+	dp->max_lanes = 0;
+	dp->max_rate = 0;
 	if (!dp->connected) {
 		kfree(dp->edid);
 		dp->edid = NULL;
@@ -570,7 +570,7 @@ static bool cdn_dp_check_link_status(struct cdn_dp_device *dp)
 	struct cdn_dp_port *port = cdn_dp_connected_port(dp);
 	u8 sink_lanes = drm_dp_max_lane_count(dp->dpcd);
 
-	if (!port || !dp->link.rate || !dp->link.num_lanes)
+	if (!port || !dp->max_rate || !dp->max_lanes)
 		return false;
 
 	if (cdn_dp_dpcd_read(dp, DP_LANE0_1_STATUS, link_status,
@@ -952,8 +952,8 @@ static void cdn_dp_pd_event_work(struct work_struct *work)
 
 	/* Enabled and connected with a sink, re-train if requested */
 	} else if (!cdn_dp_check_link_status(dp)) {
-		unsigned int rate = dp->link.rate;
-		unsigned int lanes = dp->link.num_lanes;
+		unsigned int rate = dp->max_rate;
+		unsigned int lanes = dp->max_lanes;
 		struct drm_display_mode *mode = &dp->mode;
 
 		DRM_DEV_INFO(dp->dev, "Connected with sink. Re-train link\n");
@@ -966,7 +966,7 @@ static void cdn_dp_pd_event_work(struct work_struct *work)
 
 		/* If training result is changed, update the video config */
 		if (mode->clock &&
-		    (rate != dp->link.rate || lanes != dp->link.num_lanes)) {
+		    (rate != dp->max_rate || lanes != dp->max_lanes)) {
 			ret = cdn_dp_config_video(dp);
 			if (ret) {
 				dp->connected = false;

drivers/gpu/drm/rockchip/cdn-dp-core.h

@@ -92,9 +92,10 @@ struct cdn_dp_device {
 	struct reset_control *core_rst;
 	struct audio_info audio_info;
 	struct video_info video_info;
-	struct drm_dp_link link;
 	struct cdn_dp_port *port[MAX_PHY];
 	u8 ports;
+	u8 max_lanes;
+	u8 max_rate;
 	u8 lanes;
 	int active_port;
 

drivers/gpu/drm/rockchip/cdn-dp-reg.c

@@ -535,8 +535,8 @@ static int cdn_dp_get_training_status(struct cdn_dp_device *dp)
 	if (ret)
 		goto err_get_training_status;
 
-	dp->link.rate = drm_dp_bw_code_to_link_rate(status[0]);
-	dp->link.num_lanes = status[1];
+	dp->max_rate = drm_dp_bw_code_to_link_rate(status[0]);
+	dp->max_lanes = status[1];
 
 err_get_training_status:
 	if (ret)
@@ -560,8 +560,8 @@ int cdn_dp_train_link(struct cdn_dp_device *dp)
 		return ret;
 	}
 
-	DRM_DEV_DEBUG_KMS(dp->dev, "rate:0x%x, lanes:%d\n", dp->link.rate,
-			  dp->link.num_lanes);
+	DRM_DEV_DEBUG_KMS(dp->dev, "rate:0x%x, lanes:%d\n", dp->max_rate,
+			  dp->max_lanes);
 	return ret;
 }
 
@@ -639,7 +639,7 @@ int cdn_dp_config_video(struct cdn_dp_device *dp)
 	bit_per_pix = (video->color_fmt == YCBCR_4_2_2) ?
 		      (video->color_depth * 2) : (video->color_depth * 3);
 
-	link_rate = dp->link.rate / 1000;
+	link_rate = dp->max_rate / 1000;
 
 	ret = cdn_dp_reg_write(dp, BND_HSYNC2VSYNC, VIF_BYPASS_INTERLACE);
 	if (ret)
@@ -659,14 +659,13 @@ int cdn_dp_config_video(struct cdn_dp_device *dp)
 	do {
 		tu_size_reg += 2;
 		symbol = tu_size_reg * mode->clock * bit_per_pix;
-		do_div(symbol, dp->link.num_lanes * link_rate * 8);
+		do_div(symbol, dp->max_lanes * link_rate * 8);
 		rem = do_div(symbol, 1000);
 		if (tu_size_reg > 64) {
 			ret = -EINVAL;
 			DRM_DEV_ERROR(dp->dev,
 				      "tu error, clk:%d, lanes:%d, rate:%d\n",
-				      mode->clock, dp->link.num_lanes,
-				      link_rate);
+				      mode->clock, dp->max_lanes, link_rate);
 			goto err_config_video;
 		}
 	} while ((symbol <= 1) || (tu_size_reg - symbol < 4) ||
@@ -680,7 +679,7 @@ int cdn_dp_config_video(struct cdn_dp_device *dp)
 
 	/* set the FIFO Buffer size */
 	val = div_u64(mode->clock * (symbol + 1), 1000) + link_rate;
-	val /= (dp->link.num_lanes * link_rate);
+	val /= (dp->max_lanes * link_rate);
 	val = div_u64(8 * (symbol + 1), bit_per_pix) - val;
 	val += 2;
 	ret = cdn_dp_reg_write(dp, DP_VC_TABLE(15), val);
@@ -833,7 +832,7 @@ static void cdn_dp_audio_config_i2s(struct cdn_dp_device *dp,
 	u32 val;
 
 	if (audio->channels == 2) {
-		if (dp->link.num_lanes == 1)
+		if (dp->max_lanes == 1)
 			sub_pckt_num = 2;
 		else
 			sub_pckt_num = 4;