[PATCH 1/3] Revert "drm/fb-helper: Remove damage worker"

[Thomas Zimmermann]

This reverts commit 27c3e9452d552ea86369a94f23287a9675f2d7a1.

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 at suse.de>
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
---
 drivers/gpu/drm/drm_fb_helper.c | 9 +++++++++
 include/drm/drm_fb_helper.h     | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index a1f86e436ae8e..c0e9a977a3b3c 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -403,6 +403,13 @@ static void drm_fb_helper_fb_dirty(struct drm_fb_helper *helper)
 	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) {
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 455f6c2b8117a..b111dc7ada78d 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -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;
 
 	/**
-- 
2.38.1