503 lines
15 KiB
C
503 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Copyright (C) 2017 Broadcom
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*/
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#include <drm/drm_of.h>
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#include <drm/drm_panel.h>
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#include <drm/drm_print.h>
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#include <drm/drm_probe_helper.h>
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struct panel_bridge {
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struct drm_bridge bridge;
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struct drm_connector connector;
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struct drm_panel *panel;
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u32 connector_type;
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};
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static inline struct panel_bridge *
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drm_bridge_to_panel_bridge(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct panel_bridge, bridge);
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}
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static inline struct panel_bridge *
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drm_connector_to_panel_bridge(struct drm_connector *connector)
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{
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return container_of(connector, struct panel_bridge, connector);
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}
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static int panel_bridge_connector_get_modes(struct drm_connector *connector)
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{
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struct panel_bridge *panel_bridge =
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drm_connector_to_panel_bridge(connector);
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return drm_panel_get_modes(panel_bridge->panel, connector);
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}
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static const struct drm_connector_helper_funcs
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panel_bridge_connector_helper_funcs = {
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.get_modes = panel_bridge_connector_get_modes,
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};
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static const struct drm_connector_funcs panel_bridge_connector_funcs = {
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.reset = drm_atomic_helper_connector_reset,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.destroy = drm_connector_cleanup,
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
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};
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static int panel_bridge_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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struct drm_connector *connector = &panel_bridge->connector;
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int ret;
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if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
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return 0;
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if (!bridge->encoder) {
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DRM_ERROR("Missing encoder\n");
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return -ENODEV;
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}
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drm_connector_helper_add(connector,
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&panel_bridge_connector_helper_funcs);
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ret = drm_connector_init(bridge->dev, connector,
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&panel_bridge_connector_funcs,
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panel_bridge->connector_type);
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if (ret) {
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DRM_ERROR("Failed to initialize connector\n");
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return ret;
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}
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drm_connector_attach_encoder(&panel_bridge->connector,
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bridge->encoder);
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if (bridge->dev->registered) {
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if (connector->funcs->reset)
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connector->funcs->reset(connector);
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drm_connector_register(connector);
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}
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return 0;
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}
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static void panel_bridge_detach(struct drm_bridge *bridge)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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struct drm_connector *connector = &panel_bridge->connector;
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/*
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* Cleanup the connector if we know it was initialized.
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*
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* FIXME: This wouldn't be needed if the panel_bridge structure was
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* allocated with drmm_kzalloc(). This might be tricky since the
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* drm_device pointer can only be retrieved when the bridge is attached.
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*/
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if (connector->dev)
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drm_connector_cleanup(connector);
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}
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static void panel_bridge_pre_enable(struct drm_bridge *bridge)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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drm_panel_prepare(panel_bridge->panel);
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}
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static void panel_bridge_enable(struct drm_bridge *bridge)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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drm_panel_enable(panel_bridge->panel);
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}
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static void panel_bridge_disable(struct drm_bridge *bridge)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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drm_panel_disable(panel_bridge->panel);
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}
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static void panel_bridge_post_disable(struct drm_bridge *bridge)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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drm_panel_unprepare(panel_bridge->panel);
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}
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static int panel_bridge_get_modes(struct drm_bridge *bridge,
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struct drm_connector *connector)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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return drm_panel_get_modes(panel_bridge->panel, connector);
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}
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static void panel_bridge_debugfs_init(struct drm_bridge *bridge,
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struct dentry *root)
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{
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struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
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struct drm_panel *panel = panel_bridge->panel;
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root = debugfs_create_dir("panel", root);
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if (panel->funcs->debugfs_init)
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panel->funcs->debugfs_init(panel, root);
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}
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static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
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.attach = panel_bridge_attach,
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.detach = panel_bridge_detach,
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.pre_enable = panel_bridge_pre_enable,
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.enable = panel_bridge_enable,
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.disable = panel_bridge_disable,
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.post_disable = panel_bridge_post_disable,
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.get_modes = panel_bridge_get_modes,
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.atomic_reset = drm_atomic_helper_bridge_reset,
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.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
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.atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt,
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.debugfs_init = panel_bridge_debugfs_init,
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};
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/**
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* drm_bridge_is_panel - Checks if a drm_bridge is a panel_bridge.
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*
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* @bridge: The drm_bridge to be checked.
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*
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* Returns true if the bridge is a panel bridge, or false otherwise.
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*/
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bool drm_bridge_is_panel(const struct drm_bridge *bridge)
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{
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return bridge->funcs == &panel_bridge_bridge_funcs;
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}
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EXPORT_SYMBOL(drm_bridge_is_panel);
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/**
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* drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that
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* just calls the appropriate functions from &drm_panel.
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*
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* @panel: The drm_panel being wrapped. Must be non-NULL.
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*
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* For drivers converting from directly using drm_panel: The expected
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* usage pattern is that during either encoder module probe or DSI
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* host attach, a drm_panel will be looked up through
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* drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to
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* wrap that panel in the new bridge, and the result can then be
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* passed to drm_bridge_attach(). The drm_panel_prepare() and related
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* functions can be dropped from the encoder driver (they're now
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* called by the KMS helpers before calling into the encoder), along
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* with connector creation. When done with the bridge (after
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* drm_mode_config_cleanup() if the bridge has already been attached), then
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* drm_panel_bridge_remove() to free it.
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*
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* The connector type is set to @panel->connector_type, which must be set to a
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* known type. Calling this function with a panel whose connector type is
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* DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL).
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*
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* See devm_drm_panel_bridge_add() for an automatically managed version of this
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* function.
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*/
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struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel)
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{
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if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
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return ERR_PTR(-EINVAL);
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return drm_panel_bridge_add_typed(panel, panel->connector_type);
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}
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EXPORT_SYMBOL(drm_panel_bridge_add);
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/**
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* drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with
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* an explicit connector type.
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* @panel: The drm_panel being wrapped. Must be non-NULL.
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* @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
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*
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* This is just like drm_panel_bridge_add(), but forces the connector type to
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* @connector_type instead of infering it from the panel.
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*
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* This function is deprecated and should not be used in new drivers. Use
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* drm_panel_bridge_add() instead, and fix panel drivers as necessary if they
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* don't report a connector type.
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*/
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struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
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u32 connector_type)
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{
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struct panel_bridge *panel_bridge;
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if (!panel)
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return ERR_PTR(-EINVAL);
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panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge),
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GFP_KERNEL);
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if (!panel_bridge)
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return ERR_PTR(-ENOMEM);
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panel_bridge->connector_type = connector_type;
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panel_bridge->panel = panel;
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panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs;
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#ifdef CONFIG_OF
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panel_bridge->bridge.of_node = panel->dev->of_node;
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#endif
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panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
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panel_bridge->bridge.type = connector_type;
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drm_bridge_add(&panel_bridge->bridge);
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return &panel_bridge->bridge;
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}
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EXPORT_SYMBOL(drm_panel_bridge_add_typed);
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/**
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* drm_panel_bridge_remove - Unregisters and frees a drm_bridge
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* created by drm_panel_bridge_add().
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*
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* @bridge: The drm_bridge being freed.
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*/
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void drm_panel_bridge_remove(struct drm_bridge *bridge)
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{
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struct panel_bridge *panel_bridge;
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if (!bridge)
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return;
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if (bridge->funcs != &panel_bridge_bridge_funcs)
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return;
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panel_bridge = drm_bridge_to_panel_bridge(bridge);
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drm_bridge_remove(bridge);
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devm_kfree(panel_bridge->panel->dev, bridge);
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}
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EXPORT_SYMBOL(drm_panel_bridge_remove);
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/**
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* drm_panel_bridge_set_orientation - Set the connector's panel orientation
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* from the bridge that can be transformed to panel bridge.
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*
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* @connector: The connector to be set panel orientation.
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* @bridge: The drm_bridge to be transformed to panel bridge.
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*
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* Returns 0 on success, negative errno on failure.
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*/
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int drm_panel_bridge_set_orientation(struct drm_connector *connector,
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struct drm_bridge *bridge)
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{
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struct panel_bridge *panel_bridge;
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panel_bridge = drm_bridge_to_panel_bridge(bridge);
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return drm_connector_set_orientation_from_panel(connector,
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panel_bridge->panel);
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}
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EXPORT_SYMBOL(drm_panel_bridge_set_orientation);
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static void devm_drm_panel_bridge_release(struct device *dev, void *res)
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{
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struct drm_bridge **bridge = res;
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drm_panel_bridge_remove(*bridge);
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}
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/**
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* devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector
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* that just calls the appropriate functions from &drm_panel.
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* @dev: device to tie the bridge lifetime to
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* @panel: The drm_panel being wrapped. Must be non-NULL.
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*
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* This is the managed version of drm_panel_bridge_add() which automatically
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* calls drm_panel_bridge_remove() when @dev is unbound.
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*/
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struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
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struct drm_panel *panel)
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{
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if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
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return ERR_PTR(-EINVAL);
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return devm_drm_panel_bridge_add_typed(dev, panel,
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panel->connector_type);
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}
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EXPORT_SYMBOL(devm_drm_panel_bridge_add);
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/**
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* devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and
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* &drm_connector with an explicit connector type.
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* @dev: device to tie the bridge lifetime to
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* @panel: The drm_panel being wrapped. Must be non-NULL.
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* @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
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*
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* This is just like devm_drm_panel_bridge_add(), but forces the connector type
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* to @connector_type instead of infering it from the panel.
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*
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* This function is deprecated and should not be used in new drivers. Use
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* devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if
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* they don't report a connector type.
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*/
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struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
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struct drm_panel *panel,
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u32 connector_type)
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{
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struct drm_bridge **ptr, *bridge;
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ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr),
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GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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bridge = drm_panel_bridge_add_typed(panel, connector_type);
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if (IS_ERR(bridge)) {
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devres_free(ptr);
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return bridge;
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}
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bridge->pre_enable_prev_first = panel->prepare_prev_first;
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*ptr = bridge;
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devres_add(dev, ptr);
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|
|
||
|
|
return bridge;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed);
|
||
|
|
|
||
|
|
static void drmm_drm_panel_bridge_release(struct drm_device *drm, void *ptr)
|
||
|
|
{
|
||
|
|
struct drm_bridge *bridge = ptr;
|
||
|
|
|
||
|
|
drm_panel_bridge_remove(bridge);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* drmm_panel_bridge_add - Creates a DRM-managed &drm_bridge and
|
||
|
|
* &drm_connector that just calls the
|
||
|
|
* appropriate functions from &drm_panel.
|
||
|
|
*
|
||
|
|
* @drm: DRM device to tie the bridge lifetime to
|
||
|
|
* @panel: The drm_panel being wrapped. Must be non-NULL.
|
||
|
|
*
|
||
|
|
* This is the DRM-managed version of drm_panel_bridge_add() which
|
||
|
|
* automatically calls drm_panel_bridge_remove() when @dev is cleaned
|
||
|
|
* up.
|
||
|
|
*/
|
||
|
|
struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm,
|
||
|
|
struct drm_panel *panel)
|
||
|
|
{
|
||
|
|
struct drm_bridge *bridge;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
bridge = drm_panel_bridge_add_typed(panel, panel->connector_type);
|
||
|
|
if (IS_ERR(bridge))
|
||
|
|
return bridge;
|
||
|
|
|
||
|
|
ret = drmm_add_action_or_reset(drm, drmm_drm_panel_bridge_release,
|
||
|
|
bridge);
|
||
|
|
if (ret)
|
||
|
|
return ERR_PTR(ret);
|
||
|
|
|
||
|
|
bridge->pre_enable_prev_first = panel->prepare_prev_first;
|
||
|
|
|
||
|
|
return bridge;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(drmm_panel_bridge_add);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* drm_panel_bridge_connector - return the connector for the panel bridge
|
||
|
|
* @bridge: The drm_bridge.
|
||
|
|
*
|
||
|
|
* drm_panel_bridge creates the connector.
|
||
|
|
* This function gives external access to the connector.
|
||
|
|
*
|
||
|
|
* Returns: Pointer to drm_connector
|
||
|
|
*/
|
||
|
|
struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge)
|
||
|
|
{
|
||
|
|
struct panel_bridge *panel_bridge;
|
||
|
|
|
||
|
|
panel_bridge = drm_bridge_to_panel_bridge(bridge);
|
||
|
|
|
||
|
|
return &panel_bridge->connector;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(drm_panel_bridge_connector);
|
||
|
|
|
||
|
|
#ifdef CONFIG_OF
|
||
|
|
/**
|
||
|
|
* devm_drm_of_get_bridge - Return next bridge in the chain
|
||
|
|
* @dev: device to tie the bridge lifetime to
|
||
|
|
* @np: device tree node containing encoder output ports
|
||
|
|
* @port: port in the device tree node
|
||
|
|
* @endpoint: endpoint in the device tree node
|
||
|
|
*
|
||
|
|
* Given a DT node's port and endpoint number, finds the connected node
|
||
|
|
* and returns the associated bridge if any, or creates and returns a
|
||
|
|
* drm panel bridge instance if a panel is connected.
|
||
|
|
*
|
||
|
|
* Returns a pointer to the bridge if successful, or an error pointer
|
||
|
|
* otherwise.
|
||
|
|
*/
|
||
|
|
struct drm_bridge *devm_drm_of_get_bridge(struct device *dev,
|
||
|
|
struct device_node *np,
|
||
|
|
u32 port, u32 endpoint)
|
||
|
|
{
|
||
|
|
struct drm_bridge *bridge;
|
||
|
|
struct drm_panel *panel;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = drm_of_find_panel_or_bridge(np, port, endpoint,
|
||
|
|
&panel, &bridge);
|
||
|
|
if (ret)
|
||
|
|
return ERR_PTR(ret);
|
||
|
|
|
||
|
|
if (panel)
|
||
|
|
bridge = devm_drm_panel_bridge_add(dev, panel);
|
||
|
|
|
||
|
|
return bridge;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(devm_drm_of_get_bridge);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* drmm_of_get_bridge - Return next bridge in the chain
|
||
|
|
* @drm: device to tie the bridge lifetime to
|
||
|
|
* @np: device tree node containing encoder output ports
|
||
|
|
* @port: port in the device tree node
|
||
|
|
* @endpoint: endpoint in the device tree node
|
||
|
|
*
|
||
|
|
* Given a DT node's port and endpoint number, finds the connected node
|
||
|
|
* and returns the associated bridge if any, or creates and returns a
|
||
|
|
* drm panel bridge instance if a panel is connected.
|
||
|
|
*
|
||
|
|
* Returns a drmm managed pointer to the bridge if successful, or an error
|
||
|
|
* pointer otherwise.
|
||
|
|
*/
|
||
|
|
struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm,
|
||
|
|
struct device_node *np,
|
||
|
|
u32 port, u32 endpoint)
|
||
|
|
{
|
||
|
|
struct drm_bridge *bridge;
|
||
|
|
struct drm_panel *panel;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = drm_of_find_panel_or_bridge(np, port, endpoint,
|
||
|
|
&panel, &bridge);
|
||
|
|
if (ret)
|
||
|
|
return ERR_PTR(ret);
|
||
|
|
|
||
|
|
if (panel)
|
||
|
|
bridge = drmm_panel_bridge_add(drm, panel);
|
||
|
|
|
||
|
|
return bridge;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(drmm_of_get_bridge);
|
||
|
|
|
||
|
|
#endif
|