diff options
author | Noralf Trønnes <noralf@tronnes.org> | 2017-12-15 18:51:14 +0100 |
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committer | Noralf Trønnes <noralf@tronnes.org> | 2017-12-20 14:50:48 +0100 |
commit | 8741216396b2611142d7a890d06b7040ff585b3f (patch) | |
tree | ebb9cf8487f1c4b30dc1b65077ba2d59db12a322 /drivers/gpu/drm/drm_fb_helper.c | |
parent | a65eb01ffcc50b42d1e4ea2e79c274e7f7a240c6 (diff) |
drm/fb-helper: Add drm_fb_helper_fbdev_setup/teardown()
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
Diffstat (limited to 'drivers/gpu/drm/drm_fb_helper.c')
-rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 04a3a5ce370a..823fc8f50d85 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -2730,6 +2730,112 @@ 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 * |