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drm/fb-helper: Call fb_sync in I/O functions

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Call struct fb_ops.fb_sync in drm_fbdev_{read,write}() to mimic the
behavior of fbdev. Fbdev implementations of fb_read and fb_write in
struct fb_ops invoke fb_sync to synchronize with outstanding operations
before I/O. Doing the same in DRM implementations will allow us to use
them throughout DRM drivers.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221103151446.2638-17-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2022-11-03 16:14:39 +01:00
parent f231af498c
commit 3add5f9773
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/drm_fb_helper.c
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@ -2246,6 +2246,9 @@ static ssize_t drm_fbdev_fb_read(struct fb_info *info, char __user *buf,
if (total_size - count < pos)
count = total_size - pos;
if (info->fbops->fb_sync)
info->fbops->fb_sync(info);
if (drm_fbdev_use_iomem(info))
ret = fb_read_screen_base(info, buf, count, pos);
else
@ -2327,6 +2330,9 @@ static ssize_t drm_fbdev_fb_write(struct fb_info *info, const char __user *buf,
count = total_size - pos;
}
if (info->fbops->fb_sync)
info->fbops->fb_sync(info);
/*
* Copy to framebuffer even if we already logged an error. Emulates
* the behavior of the original fbdev implementation.