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drm/fb-helper: improve documentation and print warnings

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Clarify the relation between drm_fb_helper_fbdev_setup/teardown. Clarify
requirements for the new generic fbdev emulation API and log some more
details in case the driver does something wrong. Fix related typos.

Cc: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20180906221810.20170-5-peter@lekensteyn.nl
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Peter Wu 2018-09-07 00:18:10 +02:00 committed by Gerd Hoffmann
parent 7780eb9ce8
commit c10802b684
1 changed files with 18 additions and 6 deletions
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24
drivers/gpu/drm/drm_fb_helper.c
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@ -2821,7 +2821,9 @@ EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
* The caller must to provide a &drm_fb_helper_funcs->fb_probe callback
* function.
*
* See also: drm_fb_helper_initial_config()
* Use drm_fb_helper_fbdev_teardown() to destroy the fbdev.
*
* See also: drm_fb_helper_initial_config(), drm_fbdev_generic_setup().
*
* Returns:
* Zero on success or negative error code on failure.
@ -3037,7 +3039,7 @@ static struct fb_deferred_io drm_fbdev_defio = {
* @fb_helper: fbdev helper structure
* @sizes: describes fbdev size and scanout surface size
*
* This function uses the client API to crate a framebuffer backed by a dumb buffer.
* This function uses the client API to create a framebuffer backed by a dumb buffer.
*
* The _sys_ versions are used for &fb_ops.fb_read, fb_write, fb_fillrect,
* fb_copyarea, fb_imageblit.
@ -3165,8 +3167,10 @@ static int drm_fbdev_client_hotplug(struct drm_client_dev *client)
if (dev->fb_helper)
return drm_fb_helper_hotplug_event(dev->fb_helper);
if (!dev->mode_config.num_connector)
if (!dev->mode_config.num_connector) {
DRM_DEV_DEBUG(dev->dev, "No connectors found, will not create framebuffer!\n");
return 0;
}
ret = drm_fb_helper_fbdev_setup(dev, fb_helper, &drm_fb_helper_generic_funcs,
fb_helper->preferred_bpp, 0);
@ -3187,13 +3191,14 @@ static const struct drm_client_funcs drm_fbdev_client_funcs = {
};
/**
* drm_fb_helper_generic_fbdev_setup() - Setup generic fbdev emulation
* drm_fbdev_generic_setup() - Setup generic fbdev emulation
* @dev: DRM device
* @preferred_bpp: Preferred bits per pixel for the device.
* @dev->mode_config.preferred_depth is used if this is zero.
*
* This function sets up generic fbdev emulation for drivers that supports
* dumb buffers with a virtual address and that can be mmap'ed.
* dumb buffers with a virtual address and that can be mmap'ed. If the driver
* does not support these functions, it could use drm_fb_helper_fbdev_setup().
*
* Restore, hotplug events and teardown are all taken care of. Drivers that do
* suspend/resume need to call drm_fb_helper_set_suspend_unlocked() themselves.
@ -3206,6 +3211,8 @@ static const struct drm_client_funcs drm_fbdev_client_funcs = {
* This function is safe to call even when there are no connectors present.
* Setup will be retried on the next hotplug event.
*
* The fbdev is destroyed by drm_dev_unregister().
*
* Returns:
* Zero on success or negative error code on failure.
*/
@ -3214,6 +3221,8 @@ int drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
struct drm_fb_helper *fb_helper;
int ret;
WARN(dev->fb_helper, "fb_helper is already set!\n");
if (!drm_fbdev_emulation)
return 0;
@ -3224,12 +3233,15 @@ int drm_fbdev_generic_setup(struct drm_device *dev, unsigned int preferred_bpp)
ret = drm_client_new(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);
if (ret) {
kfree(fb_helper);
DRM_DEV_ERROR(dev->dev, "Failed to register client: %d\n", ret);
return ret;
}
fb_helper->preferred_bpp = preferred_bpp;
drm_fbdev_client_hotplug(&fb_helper->client);
ret = drm_fbdev_client_hotplug(&fb_helper->client);
if (ret)
DRM_DEV_DEBUG(dev->dev, "client hotplug ret=%d\n", ret);
return 0;
}