1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
17  * dp_bridge_detect - callback to determine if connector is connected
18  * @bridge: Pointer to drm bridge structure
19  * Returns: Bridge's 'is connected' status
21 static enum drm_connector_status dp_bridge_detect(struct drm_bridge *bridge)  in dp_bridge_detect()  argument
23 	struct msm_dp *dp;  in dp_bridge_detect()  local
25 	dp = to_dp_bridge(bridge)->dp_display;  in dp_bridge_detect()
27 	drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",  in dp_bridge_detect()
28 		(dp->is_connected) ? "true" : "false");  in dp_bridge_detect()
30 	return (dp->is_connected) ? connector_status_connected :  in dp_bridge_detect()
34 static int dp_bridge_atomic_check(struct drm_bridge *bridge,  in dp_bridge_atomic_check()  argument
39 	struct msm_dp *dp;  in dp_bridge_atomic_check()  local
41 	dp = to_dp_bridge(bridge)->dp_display;  in dp_bridge_atomic_check()
43 	drm_dbg_dp(dp->drm_dev, "is_connected = %s\n",  in dp_bridge_atomic_check()
44 		(dp->is_connected) ? "true" : "false");  in dp_bridge_atomic_check()
50 	 * crtc->active is still true. Any attempt to set the mode or manually  in dp_bridge_atomic_check()
57 	if (bridge->ops & DRM_BRIDGE_OP_HPD)  in dp_bridge_atomic_check()
58 		return (dp->is_connected) ? 0 : -ENOTCONN;  in dp_bridge_atomic_check()
65  * dp_bridge_get_modes - callback to add drm modes via drm_mode_probed_add()
66  * @bridge: Poiner to drm bridge
70 static int dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *connector)  in dp_bridge_get_modes()  argument
73 	struct msm_dp *dp;  in dp_bridge_get_modes()  local
78 	dp = to_dp_bridge(bridge)->dp_display;  in dp_bridge_get_modes()
81 	if (dp->is_connected) {  in dp_bridge_get_modes()
82 		rc = dp_display_get_modes(dp);  in dp_bridge_get_modes()
84 			DRM_ERROR("failed to get DP sink modes, rc=%d\n", rc);  in dp_bridge_get_modes()
88 		drm_dbg_dp(connector->dev, "No sink connected\n");  in dp_bridge_get_modes()
112 	struct drm_bridge *bridge;  in dp_bridge_init()  local
114 	dp_bridge = devm_kzalloc(dev->dev, sizeof(*dp_bridge), GFP_KERNEL);  in dp_bridge_init()
116 		return ERR_PTR(-ENOMEM);  in dp_bridge_init()
118 	dp_bridge->dp_display = dp_display;  in dp_bridge_init()
120 	bridge = &dp_bridge->bridge;  in dp_bridge_init()
121 	bridge->funcs = &dp_bridge_ops;  in dp_bridge_init()
122 	bridge->type = dp_display->connector_type;  in dp_bridge_init()
125 	 * Many ops only make sense for DP. Why?  in dp_bridge_init()
126 	 * - Detect/HPD are used by DRM to know if a display is _physically_  in dp_bridge_init()
131 	 * - Currently eDP mode reading is driven by the panel driver. This  in dp_bridge_init()
135 	if (!dp_display->is_edp) {  in dp_bridge_init()
136 		bridge->ops =  in dp_bridge_init()
142 	drm_bridge_add(bridge);  in dp_bridge_init()
144 	rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);  in dp_bridge_init()
146 		DRM_ERROR("failed to attach bridge, rc=%d\n", rc);  in dp_bridge_init()
147 		drm_bridge_remove(bridge);  in dp_bridge_init()
152 	if (dp_display->next_bridge) {  in dp_bridge_init()
154 					dp_display->next_bridge, bridge,  in dp_bridge_init()
157 			DRM_ERROR("failed to attach panel bridge: %d\n", rc);  in dp_bridge_init()
158 			drm_bridge_remove(bridge);  in dp_bridge_init()
163 	return bridge;  in dp_bridge_init()
171 	connector = drm_bridge_connector_init(dp_display->drm_dev, encoder);  in dp_drm_connector_init()