1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
17  * msm_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 msm_dp_bridge_detect(struct drm_bridge *bridge)  in msm_dp_bridge_detect()  argument
25 	dp = to_dp_bridge(bridge)->msm_dp_display;  in msm_dp_bridge_detect()
27 	drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",  in msm_dp_bridge_detect()
28 		(dp->link_ready) ? "true" : "false");  in msm_dp_bridge_detect()
30 	return (dp->link_ready) ? connector_status_connected :  in msm_dp_bridge_detect()
34 static int msm_dp_bridge_atomic_check(struct drm_bridge *bridge,  in msm_dp_bridge_atomic_check()  argument
41 	dp = to_dp_bridge(bridge)->msm_dp_display;  in msm_dp_bridge_atomic_check()
43 	drm_dbg_dp(dp->drm_dev, "link_ready = %s\n",  in msm_dp_bridge_atomic_check()
44 		(dp->link_ready) ? "true" : "false");  in msm_dp_bridge_atomic_check()
47 	 * There is no protection in the DRM framework to check if the display  in msm_dp_bridge_atomic_check()
50 	 * crtc->active is still true. Any attempt to set the mode or manually  in msm_dp_bridge_atomic_check()
57 	if (bridge->ops & DRM_BRIDGE_OP_HPD)  in msm_dp_bridge_atomic_check()
58 		return (dp->link_ready) ? 0 : -ENOTCONN;  in msm_dp_bridge_atomic_check()
65  * msm_dp_bridge_get_modes - callback to add drm modes via drm_mode_probed_add()
66  * @bridge: Poiner to drm bridge
70 static int msm_dp_bridge_get_modes(struct drm_bridge *bridge, struct drm_connector *connector)  in msm_dp_bridge_get_modes()  argument
78 	dp = to_dp_bridge(bridge)->msm_dp_display;  in msm_dp_bridge_get_modes()
81 	if (dp->link_ready) {  in msm_dp_bridge_get_modes()
88 		drm_dbg_dp(connector->dev, "No sink connected\n");  in msm_dp_bridge_get_modes()
93 static void msm_dp_bridge_debugfs_init(struct drm_bridge *bridge, struct dentry *root)  in msm_dp_bridge_debugfs_init()  argument
95 	struct msm_dp *dp = to_dp_bridge(bridge)->msm_dp_display;  in msm_dp_bridge_debugfs_init()
123 	struct msm_dp *dp = to_dp_bridge(drm_bridge)->msm_dp_display;  in msm_edp_bridge_atomic_check()
126 		return -ENODEV;  in msm_edp_bridge_atomic_check()
128 	conn_state->self_refresh_aware = dp->psr_supported;  in msm_edp_bridge_atomic_check()
130 	if (!conn_state->crtc || !crtc_state)  in msm_edp_bridge_atomic_check()
133 	if (crtc_state->self_refresh_active && !dp->psr_supported)  in msm_edp_bridge_atomic_check()
134 		return -EINVAL;  in msm_edp_bridge_atomic_check()
142 	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;  in msm_edp_bridge_atomic_enable()
146 	struct msm_dp *dp = msm_dp_bridge->msm_dp_display;  in msm_edp_bridge_atomic_enable()
152 	 * bridge enable sequence.  in msm_edp_bridge_atomic_enable()
155 						   drm_bridge->encoder);  in msm_edp_bridge_atomic_enable()
161 	if (old_crtc_state && old_crtc_state->self_refresh_active) {  in msm_edp_bridge_atomic_enable()
172 	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;  in msm_edp_bridge_atomic_disable()
176 	struct msm_dp *dp = msm_dp_bridge->msm_dp_display;  in msm_edp_bridge_atomic_disable()
179 						   drm_bridge->encoder);  in msm_edp_bridge_atomic_disable()
194 	 * If old crtc state is active, then this is a display disable  in msm_edp_bridge_atomic_disable()
200 	 * when display disable occurs while the sink is in psr state.  in msm_edp_bridge_atomic_disable()
202 	if (new_crtc_state->self_refresh_active) {  in msm_edp_bridge_atomic_disable()
205 	} else if (old_crtc_state->self_refresh_active) {  in msm_edp_bridge_atomic_disable()
217 	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;  in msm_edp_bridge_atomic_post_disable()
222 						   drm_bridge->encoder);  in msm_edp_bridge_atomic_post_disable()
233 	if (new_crtc_state->self_refresh_active)  in msm_edp_bridge_atomic_post_disable()
240  * msm_edp_bridge_mode_valid - callback to determine if specified mode is valid
241  * @bridge: Pointer to drm bridge structure
242  * @info: display info
246 static enum drm_mode_status msm_edp_bridge_mode_valid(struct drm_bridge *bridge,  in msm_edp_bridge_mode_valid()  argument
251 	int mode_pclk_khz = mode->clock;  in msm_edp_bridge_mode_valid()
253 	dp = to_dp_bridge(bridge)->msm_dp_display;  in msm_edp_bridge_mode_valid()
255 	if (!dp || !mode_pclk_khz || !dp->connector) {  in msm_edp_bridge_mode_valid()
257 		return -EINVAL;  in msm_edp_bridge_mode_valid()
274 static void msm_edp_bridge_debugfs_init(struct drm_bridge *bridge, struct dentry *root)  in msm_edp_bridge_debugfs_init()  argument
276 	struct msm_dp *dp = to_dp_bridge(bridge)->msm_dp_display;  in msm_edp_bridge_debugfs_init()
299 	struct drm_bridge *bridge;  in msm_dp_bridge_init()  local
301 	msm_dp_bridge = devm_kzalloc(dev->dev, sizeof(*msm_dp_bridge), GFP_KERNEL);  in msm_dp_bridge_init()
303 		return -ENOMEM;  in msm_dp_bridge_init()
305 	msm_dp_bridge->msm_dp_display = msm_dp_display;  in msm_dp_bridge_init()
307 	bridge = &msm_dp_bridge->bridge;  in msm_dp_bridge_init()
308 	bridge->funcs = msm_dp_display->is_edp ? &msm_edp_bridge_ops : &msm_dp_bridge_ops;  in msm_dp_bridge_init()
309 	bridge->type = msm_dp_display->connector_type;  in msm_dp_bridge_init()
310 	bridge->ycbcr_420_allowed = yuv_supported;  in msm_dp_bridge_init()
314 	 * - Detect/HPD are used by DRM to know if a display is _physically_  in msm_dp_bridge_init()
315 	 *   there, not whether the display is powered on / finished initting.  in msm_dp_bridge_init()
316 	 *   On eDP we assume the display is always there because you can't  in msm_dp_bridge_init()
318 	 *   assume our display is always there.  in msm_dp_bridge_init()
319 	 * - Currently eDP mode reading is driven by the panel driver. This  in msm_dp_bridge_init()
323 	if (!msm_dp_display->is_edp) {  in msm_dp_bridge_init()
324 		bridge->ops =  in msm_dp_bridge_init()
330 	rc = devm_drm_bridge_add(dev->dev, bridge);  in msm_dp_bridge_init()
332 		DRM_ERROR("failed to add bridge, rc=%d\n", rc);  in msm_dp_bridge_init()
337 	rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);  in msm_dp_bridge_init()
339 		DRM_ERROR("failed to attach bridge, rc=%d\n", rc);  in msm_dp_bridge_init()
344 	if (msm_dp_display->next_bridge) {  in msm_dp_bridge_init()
346 					msm_dp_display->next_bridge, bridge,  in msm_dp_bridge_init()
349 			DRM_ERROR("failed to attach panel bridge: %d\n", rc);  in msm_dp_bridge_init()
363 	connector = drm_bridge_connector_init(msm_dp_display->drm_dev, encoder);  in msm_dp_drm_connector_init()
367 	if (!msm_dp_display->is_edp)  in msm_dp_drm_connector_init()