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drm/fb-helper: Add drm_fb_helper_fbdev_setup/teardown()

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Add helpers to setup and teardown fbdev emulation.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171215175119.36181-3-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes 2017-12-15 18:51:14 +01:00
parent a65eb01ffc
commit 8741216396
2 changed files with 131 additions and 0 deletions
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106
drivers/gpu/drm/drm_fb_helper.c
View File

@ -2729,6 +2729,112 @@ int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
}
EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
/**
* drm_fb_helper_fbdev_setup() - Setup fbdev emulation
* @dev: DRM device
* @fb_helper: fbdev helper structure to set up
* @funcs: fbdev helper functions
* @preferred_bpp: Preferred bits per pixel for the device.
* @dev->mode_config.preferred_depth is used if this is zero.
* @max_conn_count: Maximum number of connectors.
* @dev->mode_config.num_connector is used if this is zero.
*
* This function sets up fbdev emulation and registers fbdev for access by
* userspace. If all connectors are disconnected, setup is deferred to the next
* time drm_fb_helper_hotplug_event() is called.
* The caller must to provide a &drm_fb_helper_funcs->fb_probe callback
* function.
*
* See also: drm_fb_helper_initial_config()
*
* Returns:
* Zero on success or negative error code on failure.
*/
int drm_fb_helper_fbdev_setup(struct drm_device *dev,
struct drm_fb_helper *fb_helper,
const struct drm_fb_helper_funcs *funcs,
unsigned int preferred_bpp,
unsigned int max_conn_count)
{
int ret;
if (!preferred_bpp)
preferred_bpp = dev->mode_config.preferred_depth;
if (!preferred_bpp)
preferred_bpp = 32;
if (!max_conn_count)
max_conn_count = dev->mode_config.num_connector;
if (!max_conn_count) {
DRM_DEV_ERROR(dev->dev, "No connectors\n");
return -EINVAL;
}
drm_fb_helper_prepare(dev, fb_helper, funcs);
ret = drm_fb_helper_init(dev, fb_helper, max_conn_count);
if (ret < 0) {
DRM_DEV_ERROR(dev->dev, "Failed to initialize fbdev helper\n");
return ret;
}
ret = drm_fb_helper_single_add_all_connectors(fb_helper);
if (ret < 0) {
DRM_DEV_ERROR(dev->dev, "Failed to add connectors\n");
goto err_drm_fb_helper_fini;
}
if (!drm_drv_uses_atomic_modeset(dev))
drm_helper_disable_unused_functions(dev);
ret = drm_fb_helper_initial_config(fb_helper, preferred_bpp);
if (ret < 0) {
DRM_DEV_ERROR(dev->dev, "Failed to set fbdev configuration\n");
goto err_drm_fb_helper_fini;
}
return 0;
err_drm_fb_helper_fini:
drm_fb_helper_fini(fb_helper);
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_fbdev_setup);
/**
* drm_fb_helper_fbdev_teardown - Tear down fbdev emulation
* @dev: DRM device
*
* This function unregisters fbdev if not already done and cleans up the
* associated resources including the &drm_framebuffer.
* The driver is responsible for freeing the &drm_fb_helper structure which is
* stored in &drm_device->fb_helper. Do note that this pointer has been cleared
* when this function returns.
*
* In order to support device removal/unplug while file handles are still open,
* drm_fb_helper_unregister_fbi() should be called on device removal and
* drm_fb_helper_fbdev_teardown() in the &drm_driver->release callback when
* file handles are closed.
*/
void drm_fb_helper_fbdev_teardown(struct drm_device *dev)
{
struct drm_fb_helper *fb_helper = dev->fb_helper;
if (!fb_helper)
return;
/* Unregister if it hasn't been done already */
if (fb_helper->fbdev && fb_helper->fbdev->dev)
drm_fb_helper_unregister_fbi(fb_helper);
drm_fb_helper_fini(fb_helper);
if (fb_helper->fb)
drm_framebuffer_remove(fb_helper->fb);
}
EXPORT_SYMBOL(drm_fb_helper_fbdev_teardown);
/**
* drm_fb_helper_lastclose - DRM driver lastclose helper for fbdev emulation
* @dev: DRM device

25
include/drm/drm_fb_helper.h
View File

@ -320,6 +320,13 @@ int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_
int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
struct drm_connector *connector);
int drm_fb_helper_fbdev_setup(struct drm_device *dev,
struct drm_fb_helper *fb_helper,
const struct drm_fb_helper_funcs *funcs,
unsigned int preferred_bpp,
unsigned int max_conn_count);
void drm_fb_helper_fbdev_teardown(struct drm_device *dev);
void drm_fb_helper_lastclose(struct drm_device *dev);
void drm_fb_helper_output_poll_changed(struct drm_device *dev);
#else
@ -525,6 +532,24 @@ drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
return 0;
}
static inline int
drm_fb_helper_fbdev_setup(struct drm_device *dev,
struct drm_fb_helper *fb_helper,
const struct drm_fb_helper_funcs *funcs,
unsigned int preferred_bpp,
unsigned int max_conn_count)
{
/* So drivers can use it to free the struct */
dev->fb_helper = fb_helper;
return 0;
}
static inline void drm_fb_helper_fbdev_teardown(struct drm_device *dev)
{
dev->fb_helper = NULL;
}
static inline void drm_fb_helper_lastclose(struct drm_device *dev)
{
}