// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Laurent Pinchart <[email protected]>
* Copyright (C) 2017 Broadcom
*/
#include <linux/debugfs.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_connector.h>
#include <drm/drm_encoder.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
struct panel_bridge {
struct drm_bridge bridge;
struct drm_connector connector;
struct drm_panel *panel;
u32 connector_type;
};
static inline struct panel_bridge *
drm_bridge_to_panel_bridge(struct drm_bridge *bridge)
{
return container_of(bridge, struct panel_bridge, bridge);
}
static inline struct panel_bridge *
drm_connector_to_panel_bridge(struct drm_connector *connector)
{
return container_of(connector, struct panel_bridge, connector);
}
static int panel_bridge_connector_get_modes(struct drm_connector *connector)
{
struct panel_bridge *panel_bridge =
drm_connector_to_panel_bridge(connector);
return drm_panel_get_modes(panel_bridge->panel, connector);
}
static const struct drm_connector_helper_funcs
panel_bridge_connector_helper_funcs = {
.get_modes = panel_bridge_connector_get_modes,
};
static const struct drm_connector_funcs panel_bridge_connector_funcs = {
.reset = drm_atomic_helper_connector_reset,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static int panel_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_connector *connector = &panel_bridge->connector;
int ret;
if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
return 0;
drm_connector_helper_add(connector,
&panel_bridge_connector_helper_funcs);
ret = drm_connector_init(bridge->dev, connector,
&panel_bridge_connector_funcs,
panel_bridge->connector_type);
if (ret) {
DRM_ERROR("Failed to initialize connector\n");
return ret;
}
drm_panel_bridge_set_orientation(connector, bridge);
drm_connector_attach_encoder(&panel_bridge->connector,
bridge->encoder);
if (bridge->dev->registered) {
if (connector->funcs->reset)
connector->funcs->reset(connector);
drm_connector_register(connector);
}
return 0;
}
static void panel_bridge_detach(struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_connector *connector = &panel_bridge->connector;
/*
* Cleanup the connector if we know it was initialized.
*
* FIXME: This wouldn't be needed if the panel_bridge structure was
* allocated with drmm_kzalloc(). This might be tricky since the
* drm_device pointer can only be retrieved when the bridge is attached.
*/
if (connector->dev)
drm_connector_cleanup(connector);
}
static void panel_bridge_atomic_pre_enable(struct drm_bridge *bridge,
struct drm_bridge_state *old_bridge_state)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
struct drm_encoder *encoder = bridge->encoder;
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state;
crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
if (!crtc)
return;
old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
if (old_crtc_state && old_crtc_state->self_refresh_active)
return;
drm_panel_prepare(panel_bridge->panel);
}
static void panel_bridge_atomic_enable(struct drm_bridge *bridge,
struct drm_bridge_state *old_bridge_state)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
struct drm_encoder *encoder = bridge->encoder;
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state;
crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
if (!crtc)
return;
old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
if (old_crtc_state && old_crtc_state->self_refresh_active)
return;
drm_panel_enable(panel_bridge->panel);
}
static void panel_bridge_atomic_disable(struct drm_bridge *bridge,
struct drm_bridge_state *old_bridge_state)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
struct drm_encoder *encoder = bridge->encoder;
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
if (!crtc)
return;
new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
if (new_crtc_state && new_crtc_state->self_refresh_active)
return;
drm_panel_disable(panel_bridge->panel);
}
static void panel_bridge_atomic_post_disable(struct drm_bridge *bridge,
struct drm_bridge_state *old_bridge_state)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
struct drm_encoder *encoder = bridge->encoder;
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
if (!crtc)
return;
new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
if (new_crtc_state && new_crtc_state->self_refresh_active)
return;
drm_panel_unprepare(panel_bridge->panel);
}
static int panel_bridge_get_modes(struct drm_bridge *bridge,
struct drm_connector *connector)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
return drm_panel_get_modes(panel_bridge->panel, connector);
}
static void panel_bridge_debugfs_init(struct drm_bridge *bridge,
struct dentry *root)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_panel *panel = panel_bridge->panel;
root = debugfs_create_dir("panel", root);
if (panel->funcs->debugfs_init)
panel->funcs->debugfs_init(panel, root);
}
static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
.attach = panel_bridge_attach,
.detach = panel_bridge_detach,
.atomic_pre_enable = panel_bridge_atomic_pre_enable,
.atomic_enable = panel_bridge_atomic_enable,
.atomic_disable = panel_bridge_atomic_disable,
.atomic_post_disable = panel_bridge_atomic_post_disable,
.get_modes = panel_bridge_get_modes,
.atomic_reset = drm_atomic_helper_bridge_reset,
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt,
.debugfs_init = panel_bridge_debugfs_init,
};
/**
* drm_bridge_is_panel - Checks if a drm_bridge is a panel_bridge.
*
* @bridge: The drm_bridge to be checked.
*
* Returns true if the bridge is a panel bridge, or false otherwise.
*/
bool drm_bridge_is_panel(const struct drm_bridge *bridge)
{
return bridge->funcs == &panel_bridge_bridge_funcs;
}
EXPORT_SYMBOL(drm_bridge_is_panel);
/**
* drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that
* just calls the appropriate functions from &drm_panel.
*
* @panel: The drm_panel being wrapped. Must be non-NULL.
*
* For drivers converting from directly using drm_panel: The expected
* usage pattern is that during either encoder module probe or DSI
* host attach, a drm_panel will be looked up through
* drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to
* wrap that panel in the new bridge, and the result can then be
* passed to drm_bridge_attach(). The drm_panel_prepare() and related
* functions can be dropped from the encoder driver (they're now
* called by the KMS helpers before calling into the encoder), along
* with connector creation. When done with the bridge (after
* drm_mode_config_cleanup() if the bridge has already been attached), then
* drm_panel_bridge_remove() to free it.
*
* The connector type is set to @panel->connector_type, which must be set to a
* known type. Calling this function with a panel whose connector type is
* DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL).
*
* See devm_drm_panel_bridge_add() for an automatically managed version of this
* function.
*/
struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel)
{
if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
return ERR_PTR(-EINVAL);
return drm_panel_bridge_add_typed(panel, panel->connector_type);
}
EXPORT_SYMBOL(drm_panel_bridge_add);
/**
* drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with
* an explicit connector type.
* @panel: The drm_panel being wrapped. Must be non-NULL.
* @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
*
* This is just like drm_panel_bridge_add(), but forces the connector type to
* @connector_type instead of infering it from the panel.
*
* This function is deprecated and should not be used in new drivers. Use
* drm_panel_bridge_add() instead, and fix panel drivers as necessary if they
* don't report a connector type.
*/
struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
u32 connector_type)
{
struct panel_bridge *panel_bridge;
if (!panel)
return ERR_PTR(-EINVAL);
panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge),
GFP_KERNEL);
if (!panel_bridge)
return ERR_PTR(-ENOMEM);
panel_bridge->connector_type = connector_type;
panel_bridge->panel = panel;
panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs;
panel_bridge->bridge.of_node = panel->dev->of_node;
panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
panel_bridge->bridge.type = connector_type;
drm_bridge_add(&panel_bridge->bridge);
return &panel_bridge->bridge;
}
EXPORT_SYMBOL(drm_panel_bridge_add_typed);
/**
* drm_panel_bridge_remove - Unregisters and frees a drm_bridge
* created by drm_panel_bridge_add().
*
* @bridge: The drm_bridge being freed.
*/
void drm_panel_bridge_remove(struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge;
if (!bridge)
return;
if (bridge->funcs != &panel_bridge_bridge_funcs)
return;
panel_bridge = drm_bridge_to_panel_bridge(bridge);
drm_bridge_remove(bridge);
devm_kfree(panel_bridge->panel->dev, bridge);
}
EXPORT_SYMBOL(drm_panel_bridge_remove);
/**
* drm_panel_bridge_set_orientation - Set the connector's panel orientation
* from the bridge that can be transformed to panel bridge.
*
* @connector: The connector to be set panel orientation.
* @bridge: The drm_bridge to be transformed to panel bridge.
*
* Returns 0 on success, negative errno on failure.
*/
int drm_panel_bridge_set_orientation(struct drm_connector *connector,
struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge;
panel_bridge = drm_bridge_to_panel_bridge(bridge);
return drm_connector_set_orientation_from_panel(connector,
panel_bridge->panel);
}
EXPORT_SYMBOL(drm_panel_bridge_set_orientation);
static void devm_drm_panel_bridge_release(struct device *dev, void *res)
{
struct drm_bridge *bridge = *(struct drm_bridge **)res;
if (!bridge)
return;
drm_bridge_remove(bridge);
}
/**
* devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector
* that just calls the appropriate functions from &drm_panel.
* @dev: device to tie the bridge lifetime to
* @panel: The drm_panel being wrapped. Must be non-NULL.
*
* This is the managed version of drm_panel_bridge_add() which automatically
* calls drm_panel_bridge_remove() when @dev is unbound.
*/
struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
struct drm_panel *panel)
{
if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
return ERR_PTR(-EINVAL);
return devm_drm_panel_bridge_add_typed(dev, panel,
panel->connector_type);
}
EXPORT_SYMBOL(devm_drm_panel_bridge_add);
/**
* devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and
* &drm_connector with an explicit connector type.
* @dev: device to tie the bridge lifetime to
* @panel: The drm_panel being wrapped. Must be non-NULL.
* @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
*
* This is just like devm_drm_panel_bridge_add(), but forces the connector type
* to @connector_type instead of infering it from the panel.
*
* This function is deprecated and should not be used in new drivers. Use
* devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if
* they don't report a connector type.
*/
struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
struct drm_panel *panel,
u32 connector_type)
{
struct drm_bridge **ptr, *bridge;
ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
bridge = drm_panel_bridge_add_typed(panel, connector_type);
if (IS_ERR(bridge)) {
devres_free(ptr);
return bridge;
}
bridge->pre_enable_prev_first = panel->prepare_prev_first;
*ptr = bridge;
devres_add(dev, ptr);
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
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