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fb: introduce flush for virtual framebuffer 

Some drivers need an explicit sync method to flush the virtual
framebuffer to the display. It is called fb_flush().

fb_flush() gets called on fbc_putc, on fb_close and in the pattern cycle
in the fbtest command.

Signed-off-by: Bastian Stender <bst@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Bastian Stender 2017-02-28 15:31:26 +01:00 committed by Sascha Hauer
parent b4f55fcf35
commit b9cf45f00c
4 changed files with 32 additions and 0 deletions
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1
commands/fbtest.c
View File

@ -169,6 +169,7 @@ static int do_fbtest(int argc, char *argv[])
pattern = patterns[i++ % ARRAY_SIZE(patterns)].func;
pattern(sc, color);
gu_screen_blit(sc);
fb_flush(sc->info);
start = get_time_ns();
while (!is_timeout(start, 2 * SECOND))

26
drivers/video/fb.c
View File

@ -31,6 +31,30 @@ static int fb_ioctl(struct cdev* cdev, int req, void *data)
return 0;
}
static int fb_close(struct cdev *cdev)
{
struct fb_info *info = cdev->priv;
if (info->fbops->fb_flush)
info->fbops->fb_flush(info);
return 0;
}
static int fb_op_flush(struct cdev *cdev)
{
struct fb_info *info = cdev->priv;
if (info->fbops->fb_flush)
info->fbops->fb_flush(info);
return 0;
}
void fb_flush(struct fb_info *info)
{
if (info->fbops->fb_flush)
info->fbops->fb_flush(info);
}
static void fb_release_shadowfb(struct fb_info *info)
{
free(info->screen_base_shadow);
@ -199,6 +223,8 @@ static struct file_operations fb_ops = {
.memmap = generic_memmap_rw,
.lseek = dev_lseek_default,
.ioctl = fb_ioctl,
.close = fb_close,
.flush = fb_op_flush,
};
static void fb_print_mode(struct fb_videomode *mode)

3
drivers/video/fbconsole.c
View File

@ -335,6 +335,7 @@ static void fbc_putc(struct console_device *cdev, char c)
{
struct fbc_priv *priv = container_of(cdev,
struct fbc_priv, cdev);
struct fb_info *fb = priv->fb;
if (priv->in_console)
return;
@ -393,6 +394,8 @@ static void fbc_putc(struct console_device *cdev, char c)
}
priv->in_console = 0;
fb_flush(fb);
}
static int setup_font(struct fbc_priv *priv)

2
include/fb.h
View File

@ -86,6 +86,7 @@ struct fb_ops {
void (*fb_enable)(struct fb_info *info);
void (*fb_disable)(struct fb_info *info);
int (*fb_activate_var)(struct fb_info *info);
void (*fb_flush)(struct fb_info *info);
};
/*
@ -152,6 +153,7 @@ int register_framebuffer(struct fb_info *info);
int fb_enable(struct fb_info *info);
int fb_disable(struct fb_info *info);
void fb_flush(struct fb_info *info);
#define FBIOGET_SCREENINFO _IOR('F', 1, loff_t)
#define FBIO_ENABLE _IO('F', 2)