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fbdev: Send old blank state in FB_EVENT_BLANK

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The event FB_EVENT_BLANK sends the new blank state in the event's
data field. Also send the old state. It's an additional field in the
data array; existing receivers won't notice the difference.

The backlight subsystem currently tracks blank state per display per
backlight. That is not optimal as it ties backlight code to fbdev. A
subsystem should not track internal state of another subsystem. With
both, new and old, blank state in FB_EVENT_BLANK, the backlight code
will not require its own state tracker any longer.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Simona Vetter <simona.vetter@ffwll.ch>
Link: https://lore.kernel.org/r/20250321095517.313713-4-tzimmermann@suse.de
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Thomas Zimmermann
2025-03-21 10:53:56 +01:00
committed by Lee Jones
parent 7e3711eb87
commit dfb4bf1ac4
1 changed files with 4 additions and 1 deletions
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5
drivers/video/fbdev/core/fbmem.c
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@@ -343,6 +343,7 @@ int fb_blank(struct fb_info *info, int blank)
{
int old_blank = info->blank;
struct fb_event event;
int data[2];
int ret;
if (!info->fbops->fb_blank)
@@ -351,8 +352,10 @@ int fb_blank(struct fb_info *info, int blank)
if (blank > FB_BLANK_POWERDOWN)
blank = FB_BLANK_POWERDOWN;
data[0] = blank;
data[1] = old_blank;
event.info = info;
event.data = &blank;
event.data = data;
info->blank = blank;