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drivers/fb: add panbuffer clear ioctl

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Some devices need to clear the fb panbuf when waking up from sleep
to avoid outputting residual buffers from before sleeping

Signed-off-by: rongyichang <rongyichang@xiaomi.com>
This commit is contained in:
rongyichang 2024-08-08 15:51:09 +08:00 committed by Xiang Xiao
parent 2b4ab6cd29
commit 83c2a7f54e
2 changed files with 48 additions and 3 deletions
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41
drivers/video/fb.c
View File

@ -110,6 +110,8 @@ static FAR struct circbuf_s *fb_get_panbuf(FAR struct fb_chardev_s *fb,
static int fb_add_paninfo(FAR struct fb_chardev_s *fb,
FAR const union fb_paninfo_u *info,
int overlay);
static int fb_clear_paninfo(FAR struct fb_chardev_s *fb,
int overlay);
static int fb_open(FAR struct file *filep);
static int fb_close(FAR struct file *filep);
static ssize_t fb_read(FAR struct file *filep, FAR char *buffer,
@ -217,6 +219,39 @@ static int fb_add_paninfo(FAR struct fb_chardev_s *fb,
return ret <= 0 ? -ENOSPC : OK;
}
/****************************************************************************
* Name: fb_clear_paninfo
****************************************************************************/
static int fb_clear_paninfo(FAR struct fb_chardev_s *fb,
int overlay)
{
FAR struct circbuf_s *panbuf;
irqstate_t flags;
DEBUGASSERT(fb != NULL);
panbuf = fb_get_panbuf(fb, overlay);
if (panbuf == NULL)
{
return -EINVAL;
}
/* Disable the interrupt when writing to the queue to
* prevent it from being modified by the interrupted
* thread during the writing process.
*/
flags = enter_critical_section();
circbuf_reset(panbuf);
/* Re-enable interrupts */
leave_critical_section(flags);
return OK;
}
/****************************************************************************
* Name: fb_open
****************************************************************************/
@ -861,6 +896,12 @@ static int fb_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
}
break;
case FBIOPAN_CLEAR:
{
ret = fb_clear_paninfo(fb, (int)arg);
}
break;
case FBIOSET_VSYNCOFFSET:
{
fb->vsyncoffset = USEC2TICK(arg);

10
include/nuttx/video/fb.h
View File

@ -301,15 +301,19 @@
* Argument: read-only struct
* fb_planeinfo_s* */
#define FBIOSET_VSYNCOFFSET _FBIOC(0x0019) /* Set VSync offset in usec
#define FBIOPAN_CLEAR _FBIOC(0x0019) /* Pan clear */
/* Argument: read-only
* unsigned long */
#define FBIOSET_VSYNCOFFSET _FBIOC(0x001a) /* Set VSync offset in usec
* Argument: int */
/* Linux Support ************************************************************/
#define FBIOGET_VSCREENINFO _FBIOC(0x001a) /* Get video variable info */
#define FBIOGET_VSCREENINFO _FBIOC(0x001b) /* Get video variable info */
/* Argument: writable struct
* fb_var_screeninfo */
#define FBIOGET_FSCREENINFO _FBIOC(0x001b) /* Get video fix info */
#define FBIOGET_FSCREENINFO _FBIOC(0x001c) /* Get video fix info */
/* Argument: writable struct
* fb_fix_screeninfo */