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video/fb: add vsync offset support

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Android Documentation: https://source.android.com/docs/core/graphics/implement-vsync#vsync_offset

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>
This commit is contained in:
pengyiqiang
2023-03-27 14:09:59 +08:00
committed by Xiang Xiao
parent abbc661282
commit 0ed82e8380
3 changed files with 53 additions and 7 deletions
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drivers/video/fb.c
+34 -5
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@@ -39,6 +39,8 @@
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/video/fb.h>
#include <nuttx/clock.h>
#include <nuttx/wdog.h>
/****************************************************************************
* Private Types
@@ -59,6 +61,8 @@ struct fb_chardev_s
uint8_t plane; /* Video plan number */
uint8_t bpp; /* Bits per pixel */
volatile bool pollready; /* Poll ready flag */
clock_t vsyncoffset; /* VSync offset ticks */
struct wdog_s wdog; /* VSync offset timer */
};
/****************************************************************************
@@ -540,6 +544,13 @@ static int fb_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
}
break;
case FBIOSET_VSYNCOFFSET:
{
fb->vsyncoffset = USEC2TICK(arg);
ret = OK;
}
break;
case FBIOGET_VSCREENINFO:
{
struct fb_videoinfo_s vinfo;
@@ -751,6 +762,21 @@ static int fb_poll(FAR struct file *filep, struct pollfd *fds, bool setup)
return OK;
}
/****************************************************************************
* Name: fb_do_pollnotify
****************************************************************************/
static void fb_do_pollnotify(wdparm_t arg)
{
FAR struct fb_chardev_s *fb = (FAR struct fb_chardev_s *)arg;
fb->pollready = true;
/* Notify framebuffer is writable. */
poll_notify(&fb->fds, 1, POLLOUT);
}
/****************************************************************************
* Name: fb_pollnotify
*
@@ -770,11 +796,14 @@ void fb_pollnotify(FAR struct fb_vtable_s *vtable)
fb = vtable->priv;
fb->pollready = true;
/* Notify framebuffer is writable. */
poll_notify(&fb->fds, 1, POLLOUT);
if (fb->vsyncoffset > 0)
{
wd_start(&fb->wdog, fb->vsyncoffset, fb_do_pollnotify, (wdparm_t)fb);
}
else
{
fb_do_pollnotify((wdparm_t)fb);
}
}
/****************************************************************************