15e20bdf3SLaurent Pinchart // SPDX-License-Identifier: GPL-2.0+
25e20bdf3SLaurent Pinchart /*
35e20bdf3SLaurent Pinchart * Copyright (C) 2019 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
45e20bdf3SLaurent Pinchart */
55e20bdf3SLaurent Pinchart
65e20bdf3SLaurent Pinchart #include <linux/kernel.h>
75e20bdf3SLaurent Pinchart #include <linux/module.h>
85e20bdf3SLaurent Pinchart #include <linux/slab.h>
95e20bdf3SLaurent Pinchart
105e20bdf3SLaurent Pinchart #include <drm/drm_atomic_state_helper.h>
115e20bdf3SLaurent Pinchart #include <drm/drm_bridge.h>
125e20bdf3SLaurent Pinchart #include <drm/drm_bridge_connector.h>
135e20bdf3SLaurent Pinchart #include <drm/drm_connector.h>
145e20bdf3SLaurent Pinchart #include <drm/drm_device.h>
155e20bdf3SLaurent Pinchart #include <drm/drm_edid.h>
165e20bdf3SLaurent Pinchart #include <drm/drm_modeset_helper_vtables.h>
175e20bdf3SLaurent Pinchart #include <drm/drm_probe_helper.h>
185e20bdf3SLaurent Pinchart
195e20bdf3SLaurent Pinchart /**
205e20bdf3SLaurent Pinchart * DOC: overview
215e20bdf3SLaurent Pinchart *
225e20bdf3SLaurent Pinchart * The DRM bridge connector helper object provides a DRM connector
235e20bdf3SLaurent Pinchart * implementation that wraps a chain of &struct drm_bridge. The connector
245e20bdf3SLaurent Pinchart * operations are fully implemented based on the operations of the bridges in
255e20bdf3SLaurent Pinchart * the chain, and don't require any intervention from the display controller
265e20bdf3SLaurent Pinchart * driver at runtime.
275e20bdf3SLaurent Pinchart *
285e20bdf3SLaurent Pinchart * To use the helper, display controller drivers create a bridge connector with
295e20bdf3SLaurent Pinchart * a call to drm_bridge_connector_init(). This associates the newly created
305e20bdf3SLaurent Pinchart * connector with the chain of bridges passed to the function and registers it
315e20bdf3SLaurent Pinchart * with the DRM device. At that point the connector becomes fully usable, no
325e20bdf3SLaurent Pinchart * further operation is needed.
335e20bdf3SLaurent Pinchart *
345e20bdf3SLaurent Pinchart * The DRM bridge connector operations are implemented based on the operations
355e20bdf3SLaurent Pinchart * provided by the bridges in the chain. Each connector operation is delegated
365e20bdf3SLaurent Pinchart * to the bridge closest to the connector (at the end of the chain) that
375e20bdf3SLaurent Pinchart * provides the relevant functionality.
385e20bdf3SLaurent Pinchart *
395e20bdf3SLaurent Pinchart * To make use of this helper, all bridges in the chain shall report bridge
405e20bdf3SLaurent Pinchart * operation flags (&drm_bridge->ops) and bridge output type
415e20bdf3SLaurent Pinchart * (&drm_bridge->type), as well as the DRM_BRIDGE_ATTACH_NO_CONNECTOR attach
425e20bdf3SLaurent Pinchart * flag (none of the bridges shall create a DRM connector directly).
435e20bdf3SLaurent Pinchart */
445e20bdf3SLaurent Pinchart
455e20bdf3SLaurent Pinchart /**
465e20bdf3SLaurent Pinchart * struct drm_bridge_connector - A connector backed by a chain of bridges
475e20bdf3SLaurent Pinchart */
485e20bdf3SLaurent Pinchart struct drm_bridge_connector {
495e20bdf3SLaurent Pinchart /**
505e20bdf3SLaurent Pinchart * @base: The base DRM connector
515e20bdf3SLaurent Pinchart */
525e20bdf3SLaurent Pinchart struct drm_connector base;
535e20bdf3SLaurent Pinchart /**
545e20bdf3SLaurent Pinchart * @encoder:
555e20bdf3SLaurent Pinchart *
565e20bdf3SLaurent Pinchart * The encoder at the start of the bridges chain.
575e20bdf3SLaurent Pinchart */
585e20bdf3SLaurent Pinchart struct drm_encoder *encoder;
595e20bdf3SLaurent Pinchart /**
605e20bdf3SLaurent Pinchart * @bridge_edid:
615e20bdf3SLaurent Pinchart *
625e20bdf3SLaurent Pinchart * The last bridge in the chain (closest to the connector) that provides
635e20bdf3SLaurent Pinchart * EDID read support, if any (see &DRM_BRIDGE_OP_EDID).
645e20bdf3SLaurent Pinchart */
655e20bdf3SLaurent Pinchart struct drm_bridge *bridge_edid;
665e20bdf3SLaurent Pinchart /**
675e20bdf3SLaurent Pinchart * @bridge_hpd:
685e20bdf3SLaurent Pinchart *
695e20bdf3SLaurent Pinchart * The last bridge in the chain (closest to the connector) that provides
705e20bdf3SLaurent Pinchart * hot-plug detection notification, if any (see &DRM_BRIDGE_OP_HPD).
715e20bdf3SLaurent Pinchart */
725e20bdf3SLaurent Pinchart struct drm_bridge *bridge_hpd;
735e20bdf3SLaurent Pinchart /**
745e20bdf3SLaurent Pinchart * @bridge_detect:
755e20bdf3SLaurent Pinchart *
765e20bdf3SLaurent Pinchart * The last bridge in the chain (closest to the connector) that provides
775e20bdf3SLaurent Pinchart * connector detection, if any (see &DRM_BRIDGE_OP_DETECT).
785e20bdf3SLaurent Pinchart */
795e20bdf3SLaurent Pinchart struct drm_bridge *bridge_detect;
805e20bdf3SLaurent Pinchart /**
815e20bdf3SLaurent Pinchart * @bridge_modes:
825e20bdf3SLaurent Pinchart *
835e20bdf3SLaurent Pinchart * The last bridge in the chain (closest to the connector) that provides
845e20bdf3SLaurent Pinchart * connector modes detection, if any (see &DRM_BRIDGE_OP_MODES).
855e20bdf3SLaurent Pinchart */
865e20bdf3SLaurent Pinchart struct drm_bridge *bridge_modes;
875e20bdf3SLaurent Pinchart };
885e20bdf3SLaurent Pinchart
895e20bdf3SLaurent Pinchart #define to_drm_bridge_connector(x) \
905e20bdf3SLaurent Pinchart container_of(x, struct drm_bridge_connector, base)
915e20bdf3SLaurent Pinchart
925e20bdf3SLaurent Pinchart /* -----------------------------------------------------------------------------
935e20bdf3SLaurent Pinchart * Bridge Connector Hot-Plug Handling
945e20bdf3SLaurent Pinchart */
955e20bdf3SLaurent Pinchart
drm_bridge_connector_hpd_notify(struct drm_connector * connector,enum drm_connector_status status)965e20bdf3SLaurent Pinchart static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,
975e20bdf3SLaurent Pinchart enum drm_connector_status status)
985e20bdf3SLaurent Pinchart {
995e20bdf3SLaurent Pinchart struct drm_bridge_connector *bridge_connector =
1005e20bdf3SLaurent Pinchart to_drm_bridge_connector(connector);
1015e20bdf3SLaurent Pinchart struct drm_bridge *bridge;
1025e20bdf3SLaurent Pinchart
1035e20bdf3SLaurent Pinchart /* Notify all bridges in the pipeline of hotplug events. */
1045e20bdf3SLaurent Pinchart drm_for_each_bridge_in_chain(bridge_connector->encoder, bridge) {
1055e20bdf3SLaurent Pinchart if (bridge->funcs->hpd_notify)
1065e20bdf3SLaurent Pinchart bridge->funcs->hpd_notify(bridge, status);
1075e20bdf3SLaurent Pinchart }
1085e20bdf3SLaurent Pinchart }
1095e20bdf3SLaurent Pinchart
drm_bridge_connector_hpd_cb(void * cb_data,enum drm_connector_status status)1105e20bdf3SLaurent Pinchart static void drm_bridge_connector_hpd_cb(void *cb_data,
1115e20bdf3SLaurent Pinchart enum drm_connector_status status)
1125e20bdf3SLaurent Pinchart {
1135e20bdf3SLaurent Pinchart struct drm_bridge_connector *drm_bridge_connector = cb_data;
1145e20bdf3SLaurent Pinchart struct drm_connector *connector = &drm_bridge_connector->base;
1155e20bdf3SLaurent Pinchart struct drm_device *dev = connector->dev;
1165e20bdf3SLaurent Pinchart enum drm_connector_status old_status;
1175e20bdf3SLaurent Pinchart
1185e20bdf3SLaurent Pinchart mutex_lock(&dev->mode_config.mutex);
1195e20bdf3SLaurent Pinchart old_status = connector->status;
1205e20bdf3SLaurent Pinchart connector->status = status;
1215e20bdf3SLaurent Pinchart mutex_unlock(&dev->mode_config.mutex);
1225e20bdf3SLaurent Pinchart
1235e20bdf3SLaurent Pinchart if (old_status == status)
1245e20bdf3SLaurent Pinchart return;
1255e20bdf3SLaurent Pinchart
1265e20bdf3SLaurent Pinchart drm_bridge_connector_hpd_notify(connector, status);
1275e20bdf3SLaurent Pinchart
1281627f650SSimon Ser drm_kms_helper_connector_hotplug_event(connector);
1295e20bdf3SLaurent Pinchart }
1305e20bdf3SLaurent Pinchart
drm_bridge_connector_enable_hpd(struct drm_connector * connector)1314c00ac50SDmitry Baryshkov static void drm_bridge_connector_enable_hpd(struct drm_connector *connector)
13292d755d8SDmitry Baryshkov {
1335e20bdf3SLaurent Pinchart struct drm_bridge_connector *bridge_connector =
1345e20bdf3SLaurent Pinchart to_drm_bridge_connector(connector);
1355e20bdf3SLaurent Pinchart struct drm_bridge *hpd = bridge_connector->bridge_hpd;
1365e20bdf3SLaurent Pinchart
1375e20bdf3SLaurent Pinchart if (hpd)
1385e20bdf3SLaurent Pinchart drm_bridge_hpd_enable(hpd, drm_bridge_connector_hpd_cb,
1395e20bdf3SLaurent Pinchart bridge_connector);
1405e20bdf3SLaurent Pinchart }
1415e20bdf3SLaurent Pinchart
drm_bridge_connector_disable_hpd(struct drm_connector * connector)1424c00ac50SDmitry Baryshkov static void drm_bridge_connector_disable_hpd(struct drm_connector *connector)
14392d755d8SDmitry Baryshkov {
1445e20bdf3SLaurent Pinchart struct drm_bridge_connector *bridge_connector =
1455e20bdf3SLaurent Pinchart to_drm_bridge_connector(connector);
1465e20bdf3SLaurent Pinchart struct drm_bridge *hpd = bridge_connector->bridge_hpd;
1475e20bdf3SLaurent Pinchart
1485e20bdf3SLaurent Pinchart if (hpd)
1495e20bdf3SLaurent Pinchart drm_bridge_hpd_disable(hpd);
1505e20bdf3SLaurent Pinchart }
1515e20bdf3SLaurent Pinchart
1525e20bdf3SLaurent Pinchart /* -----------------------------------------------------------------------------
1535e20bdf3SLaurent Pinchart * Bridge Connector Functions
1545e20bdf3SLaurent Pinchart */
1555e20bdf3SLaurent Pinchart
1565e20bdf3SLaurent Pinchart static enum drm_connector_status
drm_bridge_connector_detect(struct drm_connector * connector,bool force)1575e20bdf3SLaurent Pinchart drm_bridge_connector_detect(struct drm_connector *connector, bool force)
1585e20bdf3SLaurent Pinchart {
1595e20bdf3SLaurent Pinchart struct drm_bridge_connector *bridge_connector =
1605e20bdf3SLaurent Pinchart to_drm_bridge_connector(connector);
1615e20bdf3SLaurent Pinchart struct drm_bridge *detect = bridge_connector->bridge_detect;
1625e20bdf3SLaurent Pinchart enum drm_connector_status status;
1635e20bdf3SLaurent Pinchart
1645e20bdf3SLaurent Pinchart if (detect) {
1655e20bdf3SLaurent Pinchart status = detect->funcs->detect(detect);
1665e20bdf3SLaurent Pinchart
1675e20bdf3SLaurent Pinchart drm_bridge_connector_hpd_notify(connector, status);
1685e20bdf3SLaurent Pinchart } else {
1695e20bdf3SLaurent Pinchart switch (connector->connector_type) {
1705e20bdf3SLaurent Pinchart case DRM_MODE_CONNECTOR_DPI:
1715e20bdf3SLaurent Pinchart case DRM_MODE_CONNECTOR_LVDS:
1725e20bdf3SLaurent Pinchart case DRM_MODE_CONNECTOR_DSI:
173c5589b39SEnric Balletbo i Serra case DRM_MODE_CONNECTOR_eDP:
1745e20bdf3SLaurent Pinchart status = connector_status_connected;
1755e20bdf3SLaurent Pinchart break;
1765e20bdf3SLaurent Pinchart default:
1775e20bdf3SLaurent Pinchart status = connector_status_unknown;
1785e20bdf3SLaurent Pinchart break;
1795e20bdf3SLaurent Pinchart }
1805e20bdf3SLaurent Pinchart }
1815e20bdf3SLaurent Pinchart
1825e20bdf3SLaurent Pinchart return status;
1835e20bdf3SLaurent Pinchart }
1845e20bdf3SLaurent Pinchart
drm_bridge_connector_destroy(struct drm_connector * connector)1855e20bdf3SLaurent Pinchart static void drm_bridge_connector_destroy(struct drm_connector *connector)
1865e20bdf3SLaurent Pinchart {
1875e20bdf3SLaurent Pinchart struct drm_bridge_connector *bridge_connector =
1885e20bdf3SLaurent Pinchart to_drm_bridge_connector(connector);
1895e20bdf3SLaurent Pinchart
1905e20bdf3SLaurent Pinchart if (bridge_connector->bridge_hpd) {
1915e20bdf3SLaurent Pinchart struct drm_bridge *hpd = bridge_connector->bridge_hpd;
1925e20bdf3SLaurent Pinchart
1935e20bdf3SLaurent Pinchart drm_bridge_hpd_disable(hpd);
1945e20bdf3SLaurent Pinchart }
1955e20bdf3SLaurent Pinchart
1965e20bdf3SLaurent Pinchart drm_connector_unregister(connector);
1975e20bdf3SLaurent Pinchart drm_connector_cleanup(connector);
1985e20bdf3SLaurent Pinchart
1995e20bdf3SLaurent Pinchart kfree(bridge_connector);
2005e20bdf3SLaurent Pinchart }
2015e20bdf3SLaurent Pinchart
drm_bridge_connector_debugfs_init(struct drm_connector * connector,struct dentry * root)2022509969aSDouglas Anderson static void drm_bridge_connector_debugfs_init(struct drm_connector *connector,
2032509969aSDouglas Anderson struct dentry *root)
2042509969aSDouglas Anderson {
2052509969aSDouglas Anderson struct drm_bridge_connector *bridge_connector =
2062509969aSDouglas Anderson to_drm_bridge_connector(connector);
2072509969aSDouglas Anderson struct drm_encoder *encoder = bridge_connector->encoder;
2082509969aSDouglas Anderson struct drm_bridge *bridge;
2092509969aSDouglas Anderson
2102509969aSDouglas Anderson list_for_each_entry(bridge, &encoder->bridge_chain, chain_node) {
2112509969aSDouglas Anderson if (bridge->funcs->debugfs_init)
2122509969aSDouglas Anderson bridge->funcs->debugfs_init(bridge, root);
2132509969aSDouglas Anderson }
2142509969aSDouglas Anderson }
2152509969aSDouglas Anderson
2165e20bdf3SLaurent Pinchart static const struct drm_connector_funcs drm_bridge_connector_funcs = {
2175e20bdf3SLaurent Pinchart .reset = drm_atomic_helper_connector_reset,
2185e20bdf3SLaurent Pinchart .detect = drm_bridge_connector_detect,
2195e20bdf3SLaurent Pinchart .fill_modes = drm_helper_probe_single_connector_modes,
2205e20bdf3SLaurent Pinchart .destroy = drm_bridge_connector_destroy,
2215e20bdf3SLaurent Pinchart .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
2225e20bdf3SLaurent Pinchart .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
2232509969aSDouglas Anderson .debugfs_init = drm_bridge_connector_debugfs_init,
2245e20bdf3SLaurent Pinchart };
2255e20bdf3SLaurent Pinchart
2265e20bdf3SLaurent Pinchart /* -----------------------------------------------------------------------------
2275e20bdf3SLaurent Pinchart * Bridge Connector Helper Functions
2285e20bdf3SLaurent Pinchart */
2295e20bdf3SLaurent Pinchart
drm_bridge_connector_get_modes_edid(struct drm_connector * connector,struct drm_bridge * bridge)2305e20bdf3SLaurent Pinchart static int drm_bridge_connector_get_modes_edid(struct drm_connector *connector,
2315e20bdf3SLaurent Pinchart struct drm_bridge *bridge)
2325e20bdf3SLaurent Pinchart {
2335e20bdf3SLaurent Pinchart enum drm_connector_status status;
2345e20bdf3SLaurent Pinchart struct edid *edid;
2355e20bdf3SLaurent Pinchart int n;
2365e20bdf3SLaurent Pinchart
2375e20bdf3SLaurent Pinchart status = drm_bridge_connector_detect(connector, false);
2385e20bdf3SLaurent Pinchart if (status != connector_status_connected)
2395e20bdf3SLaurent Pinchart goto no_edid;
2405e20bdf3SLaurent Pinchart
2415e20bdf3SLaurent Pinchart edid = bridge->funcs->get_edid(bridge, connector);
24295d7a1a6SBernard Zhao if (!drm_edid_is_valid(edid)) {
2435e20bdf3SLaurent Pinchart kfree(edid);
2445e20bdf3SLaurent Pinchart goto no_edid;
2455e20bdf3SLaurent Pinchart }
2465e20bdf3SLaurent Pinchart
2475e20bdf3SLaurent Pinchart drm_connector_update_edid_property(connector, edid);
2485e20bdf3SLaurent Pinchart n = drm_add_edid_modes(connector, edid);
2495e20bdf3SLaurent Pinchart
2505e20bdf3SLaurent Pinchart kfree(edid);
2515e20bdf3SLaurent Pinchart return n;
2525e20bdf3SLaurent Pinchart
2535e20bdf3SLaurent Pinchart no_edid:
2545e20bdf3SLaurent Pinchart drm_connector_update_edid_property(connector, NULL);
2555e20bdf3SLaurent Pinchart return 0;
2565e20bdf3SLaurent Pinchart }
2575e20bdf3SLaurent Pinchart
drm_bridge_connector_get_modes(struct drm_connector * connector)2585e20bdf3SLaurent Pinchart static int drm_bridge_connector_get_modes(struct drm_connector *connector)
2595e20bdf3SLaurent Pinchart {
2605e20bdf3SLaurent Pinchart struct drm_bridge_connector *bridge_connector =
2615e20bdf3SLaurent Pinchart to_drm_bridge_connector(connector);
2625e20bdf3SLaurent Pinchart struct drm_bridge *bridge;
2635e20bdf3SLaurent Pinchart
2645e20bdf3SLaurent Pinchart /*
2655e20bdf3SLaurent Pinchart * If display exposes EDID, then we parse that in the normal way to
2665e20bdf3SLaurent Pinchart * build table of supported modes.
2675e20bdf3SLaurent Pinchart */
2685e20bdf3SLaurent Pinchart bridge = bridge_connector->bridge_edid;
2695e20bdf3SLaurent Pinchart if (bridge)
2705e20bdf3SLaurent Pinchart return drm_bridge_connector_get_modes_edid(connector, bridge);
2715e20bdf3SLaurent Pinchart
2725e20bdf3SLaurent Pinchart /*
2735e20bdf3SLaurent Pinchart * Otherwise if the display pipeline reports modes (e.g. with a fixed
2745e20bdf3SLaurent Pinchart * resolution panel or an analog TV output), query it.
2755e20bdf3SLaurent Pinchart */
2765e20bdf3SLaurent Pinchart bridge = bridge_connector->bridge_modes;
2775e20bdf3SLaurent Pinchart if (bridge)
2785e20bdf3SLaurent Pinchart return bridge->funcs->get_modes(bridge, connector);
2795e20bdf3SLaurent Pinchart
2805e20bdf3SLaurent Pinchart /*
2815e20bdf3SLaurent Pinchart * We can't retrieve modes, which can happen for instance for a DVI or
2825e20bdf3SLaurent Pinchart * VGA output with the DDC bus unconnected. The KMS core will add the
2835e20bdf3SLaurent Pinchart * default modes.
2845e20bdf3SLaurent Pinchart */
2855e20bdf3SLaurent Pinchart return 0;
2865e20bdf3SLaurent Pinchart }
2875e20bdf3SLaurent Pinchart
2885e20bdf3SLaurent Pinchart static const struct drm_connector_helper_funcs drm_bridge_connector_helper_funcs = {
2895e20bdf3SLaurent Pinchart .get_modes = drm_bridge_connector_get_modes,
2905e20bdf3SLaurent Pinchart /* No need for .mode_valid(), the bridges are checked by the core. */
2914c00ac50SDmitry Baryshkov .enable_hpd = drm_bridge_connector_enable_hpd,
2924c00ac50SDmitry Baryshkov .disable_hpd = drm_bridge_connector_disable_hpd,
2935e20bdf3SLaurent Pinchart };
2945e20bdf3SLaurent Pinchart
2955e20bdf3SLaurent Pinchart /* -----------------------------------------------------------------------------
2965e20bdf3SLaurent Pinchart * Bridge Connector Initialisation
2975e20bdf3SLaurent Pinchart */
2985e20bdf3SLaurent Pinchart
2995e20bdf3SLaurent Pinchart /**
3005e20bdf3SLaurent Pinchart * drm_bridge_connector_init - Initialise a connector for a chain of bridges
3015e20bdf3SLaurent Pinchart * @drm: the DRM device
3025e20bdf3SLaurent Pinchart * @encoder: the encoder where the bridge chain starts
3035e20bdf3SLaurent Pinchart *
3045e20bdf3SLaurent Pinchart * Allocate, initialise and register a &drm_bridge_connector with the @drm
3055e20bdf3SLaurent Pinchart * device. The connector is associated with a chain of bridges that starts at
3065e20bdf3SLaurent Pinchart * the @encoder. All bridges in the chain shall report bridge operation flags
3075e20bdf3SLaurent Pinchart * (&drm_bridge->ops) and bridge output type (&drm_bridge->type), and none of
3085e20bdf3SLaurent Pinchart * them may create a DRM connector directly.
3095e20bdf3SLaurent Pinchart *
3105e20bdf3SLaurent Pinchart * Returns a pointer to the new connector on success, or a negative error
3115e20bdf3SLaurent Pinchart * pointer otherwise.
3125e20bdf3SLaurent Pinchart */
drm_bridge_connector_init(struct drm_device * drm,struct drm_encoder * encoder)3135e20bdf3SLaurent Pinchart struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
3145e20bdf3SLaurent Pinchart struct drm_encoder *encoder)
3155e20bdf3SLaurent Pinchart {
3165e20bdf3SLaurent Pinchart struct drm_bridge_connector *bridge_connector;
3175e20bdf3SLaurent Pinchart struct drm_connector *connector;
3185e20bdf3SLaurent Pinchart struct i2c_adapter *ddc = NULL;
31915b9ca16SHsin-Yi Wang struct drm_bridge *bridge, *panel_bridge = NULL;
3205e20bdf3SLaurent Pinchart int connector_type;
321*d0b4c1cfSGeert Uytterhoeven int ret;
3225e20bdf3SLaurent Pinchart
3235e20bdf3SLaurent Pinchart bridge_connector = kzalloc(sizeof(*bridge_connector), GFP_KERNEL);
3245e20bdf3SLaurent Pinchart if (!bridge_connector)
3255e20bdf3SLaurent Pinchart return ERR_PTR(-ENOMEM);
3265e20bdf3SLaurent Pinchart
3275e20bdf3SLaurent Pinchart bridge_connector->encoder = encoder;
3285e20bdf3SLaurent Pinchart
3295e20bdf3SLaurent Pinchart /*
3305e20bdf3SLaurent Pinchart * TODO: Handle doublescan_allowed, stereo_allowed and
3315e20bdf3SLaurent Pinchart * ycbcr_420_allowed.
3325e20bdf3SLaurent Pinchart */
3335e20bdf3SLaurent Pinchart connector = &bridge_connector->base;
3345e20bdf3SLaurent Pinchart connector->interlace_allowed = true;
3355e20bdf3SLaurent Pinchart
3365e20bdf3SLaurent Pinchart /*
3375e20bdf3SLaurent Pinchart * Initialise connector status handling. First locate the furthest
3385e20bdf3SLaurent Pinchart * bridges in the pipeline that support HPD and output detection. Then
3395e20bdf3SLaurent Pinchart * initialise the connector polling mode, using HPD if available and
3405e20bdf3SLaurent Pinchart * falling back to polling if supported. If neither HPD nor output
3415e20bdf3SLaurent Pinchart * detection are available, we don't support hotplug detection at all.
3425e20bdf3SLaurent Pinchart */
3435e20bdf3SLaurent Pinchart connector_type = DRM_MODE_CONNECTOR_Unknown;
3445e20bdf3SLaurent Pinchart drm_for_each_bridge_in_chain(encoder, bridge) {
3455e20bdf3SLaurent Pinchart if (!bridge->interlace_allowed)
3465e20bdf3SLaurent Pinchart connector->interlace_allowed = false;
3475e20bdf3SLaurent Pinchart
3485e20bdf3SLaurent Pinchart if (bridge->ops & DRM_BRIDGE_OP_EDID)
3495e20bdf3SLaurent Pinchart bridge_connector->bridge_edid = bridge;
3505e20bdf3SLaurent Pinchart if (bridge->ops & DRM_BRIDGE_OP_HPD)
3515e20bdf3SLaurent Pinchart bridge_connector->bridge_hpd = bridge;
3525e20bdf3SLaurent Pinchart if (bridge->ops & DRM_BRIDGE_OP_DETECT)
3535e20bdf3SLaurent Pinchart bridge_connector->bridge_detect = bridge;
3545e20bdf3SLaurent Pinchart if (bridge->ops & DRM_BRIDGE_OP_MODES)
3555e20bdf3SLaurent Pinchart bridge_connector->bridge_modes = bridge;
3565e20bdf3SLaurent Pinchart
3575e20bdf3SLaurent Pinchart if (!drm_bridge_get_next_bridge(bridge))
3585e20bdf3SLaurent Pinchart connector_type = bridge->type;
3595e20bdf3SLaurent Pinchart
3605e20bdf3SLaurent Pinchart if (bridge->ddc)
3615e20bdf3SLaurent Pinchart ddc = bridge->ddc;
36215b9ca16SHsin-Yi Wang
36315b9ca16SHsin-Yi Wang if (drm_bridge_is_panel(bridge))
36415b9ca16SHsin-Yi Wang panel_bridge = bridge;
3655e20bdf3SLaurent Pinchart }
3665e20bdf3SLaurent Pinchart
3675e20bdf3SLaurent Pinchart if (connector_type == DRM_MODE_CONNECTOR_Unknown) {
3685e20bdf3SLaurent Pinchart kfree(bridge_connector);
3695e20bdf3SLaurent Pinchart return ERR_PTR(-EINVAL);
3705e20bdf3SLaurent Pinchart }
3715e20bdf3SLaurent Pinchart
372*d0b4c1cfSGeert Uytterhoeven ret = drm_connector_init_with_ddc(drm, connector,
373*d0b4c1cfSGeert Uytterhoeven &drm_bridge_connector_funcs,
3745e20bdf3SLaurent Pinchart connector_type, ddc);
375*d0b4c1cfSGeert Uytterhoeven if (ret) {
376*d0b4c1cfSGeert Uytterhoeven kfree(bridge_connector);
377*d0b4c1cfSGeert Uytterhoeven return ERR_PTR(ret);
378*d0b4c1cfSGeert Uytterhoeven }
379*d0b4c1cfSGeert Uytterhoeven
3805e20bdf3SLaurent Pinchart drm_connector_helper_add(connector, &drm_bridge_connector_helper_funcs);
3815e20bdf3SLaurent Pinchart
38292d755d8SDmitry Baryshkov if (bridge_connector->bridge_hpd)
3835e20bdf3SLaurent Pinchart connector->polled = DRM_CONNECTOR_POLL_HPD;
3845e20bdf3SLaurent Pinchart else if (bridge_connector->bridge_detect)
3855e20bdf3SLaurent Pinchart connector->polled = DRM_CONNECTOR_POLL_CONNECT
3865e20bdf3SLaurent Pinchart | DRM_CONNECTOR_POLL_DISCONNECT;
3875e20bdf3SLaurent Pinchart
38815b9ca16SHsin-Yi Wang if (panel_bridge)
38915b9ca16SHsin-Yi Wang drm_panel_bridge_set_orientation(connector, panel_bridge);
39015b9ca16SHsin-Yi Wang
3915e20bdf3SLaurent Pinchart return connector;
3925e20bdf3SLaurent Pinchart }
3935e20bdf3SLaurent Pinchart EXPORT_SYMBOL_GPL(drm_bridge_connector_init);
394