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Revert "drm/fb-helper: Remove damage worker"

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This reverts commit 27c3e9452d.

Needed to restore the fbdev damage worker. There have been bug reports
about locking order [1] and incorrectly takens branches. [2] Restore
the damage worker until these problems have been resovled.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://intel-gfx-ci.01.org/tree/drm-tip/fi-kbl-8809g.html # 1
Link: https://lore.kernel.org/dri-devel/20221115115819.23088-6-tzimmermann@suse.de/T/#m06eedc0a468940e4cbbd14ca026733b639bc445a # 2
Link: https://patchwork.freedesktop.org/patch/msgid/20221118133535.9739-2-tzimmermann@suse.de
(cherry picked from commit 7aa3d63e1a)
This commit is contained in:
Thomas Zimmermann 2022-11-18 14:35:33 +01:00
parent 0c0860d190
commit 713befe893
2 changed files with 11 additions and 0 deletions
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9
drivers/gpu/drm/drm_fb_helper.c
View File

@ -403,6 +403,13 @@ err:
spin_unlock_irqrestore(&helper->damage_lock, flags);
}
static void drm_fb_helper_damage_work(struct work_struct *work)
{
struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, damage_work);
drm_fb_helper_fb_dirty(helper);
}
/**
* drm_fb_helper_prepare - setup a drm_fb_helper structure
* @dev: DRM device
@ -418,6 +425,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
INIT_LIST_HEAD(&helper->kernel_fb_list);
spin_lock_init(&helper->damage_lock);
INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker);
INIT_WORK(&helper->damage_work, drm_fb_helper_damage_work);
helper->damage_clip.x1 = helper->damage_clip.y1 = ~0;
mutex_init(&helper->lock);
helper->funcs = funcs;
@ -549,6 +557,7 @@ void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
return;
cancel_work_sync(&fb_helper->resume_work);
cancel_work_sync(&fb_helper->damage_work);
info = fb_helper->info;
if (info) {

2
include/drm/drm_fb_helper.h
View File

@ -116,6 +116,7 @@ struct drm_fb_helper_funcs {
* @damage_clip: clip rectangle used with deferred_io to accumulate damage to
* the screen buffer
* @damage_lock: spinlock protecting @damage_clip
* @damage_work: worker used to flush the framebuffer
* @resume_work: worker used during resume if the console lock is already taken
*
* This is the main structure used by the fbdev helpers. Drivers supporting
@ -145,6 +146,7 @@ struct drm_fb_helper {
u32 pseudo_palette[17];
struct drm_clip_rect damage_clip;
spinlock_t damage_lock;
struct work_struct damage_work;
struct work_struct resume_work;
/**