Release 4.17 drivers/gpu/drm/bridge/panel.c
/*
* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
* Copyright (C) 2017 Broadcom
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <drm/drmP.h>
#include <drm/drm_panel.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_encoder.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_panel.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);
}
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static inline struct panel_bridge *
drm_connector_to_panel_bridge(struct drm_connector *connector)
{
return container_of(connector, struct panel_bridge, connector);
}
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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);
}
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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)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
struct drm_connector *connector = &panel_bridge->connector;
int ret;
if (!bridge->encoder) {
DRM_ERROR("Missing encoder\n");
return -ENODEV;
}
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_mode_connector_attach_encoder(&panel_bridge->connector,
bridge->encoder);
ret = drm_panel_attach(panel_bridge->panel, &panel_bridge->connector);
if (ret < 0)
return ret;
return 0;
}
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static void panel_bridge_detach(struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
drm_panel_detach(panel_bridge->panel);
}
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static void panel_bridge_pre_enable(struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
drm_panel_prepare(panel_bridge->panel);
}
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static void panel_bridge_enable(struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
drm_panel_enable(panel_bridge->panel);
}
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static void panel_bridge_disable(struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
drm_panel_disable(panel_bridge->panel);
}
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static void panel_bridge_post_disable(struct drm_bridge *bridge)
{
struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
drm_panel_unprepare(panel_bridge->panel);
}
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static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
.attach = panel_bridge_attach,
.detach = panel_bridge_detach,
.pre_enable = panel_bridge_pre_enable,
.enable = panel_bridge_enable,
.disable = panel_bridge_disable,
.post_disable = panel_bridge_post_disable,
};
/**
* 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.
* @connector_type: The DRM_MODE_CONNECTOR_* for the connector to be
* created.
*
* 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,
* drm_bridge_detach() should be called as normal, then
* drm_panel_bridge_remove() to free it.
*/
struct drm_bridge *drm_panel_bridge_add(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;
#ifdef CONFIG_OF
panel_bridge->bridge.of_node = panel->dev->of_node;
#endif
drm_bridge_add(&panel_bridge->bridge);
return &panel_bridge->bridge;
}
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EXPORT_SYMBOL(drm_panel_bridge_add);
/**
* 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);
}
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EXPORT_SYMBOL(drm_panel_bridge_remove);
static void devm_drm_panel_bridge_release(struct device *dev, void *res)
{
struct drm_bridge **bridge = res;
drm_panel_bridge_remove(*bridge);
}
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struct drm_bridge *devm_drm_panel_bridge_add(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(panel, connector_type);
if (!IS_ERR(bridge)) {
*ptr = bridge;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return bridge;
}
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EXPORT_SYMBOL(devm_drm_panel_bridge_add);
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