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intelfb: add vsync interrupt support 

[04/05] intelfb: implement FBIO_WAITFORVSYNC ioctl

The (unofficial) FBIO_WAITFORVSYNC ioctl is implemented by sleeping on the appropriate waitqueue, as defined in my earlier patch. Currently, only display 0 (aka pipe A) is supported.

Signed-off-by: Eric Hustvedt <ehustvedt@cecropia.com>
This commit is contained in:
Eric Hustvedt 2006-06-20 14:36:42 -04:00 committed by Dave Airlie
parent 7649757bd9
commit 37bced38b3
4 changed files with 51 additions and 0 deletions
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4
drivers/video/intelfb/intelfb.h
View File

@ -304,6 +304,10 @@ struct intelfb_info {
#define IS_I9XX(dinfo) (((dinfo)->chipset == INTEL_915G)||(dinfo->chipset == INTEL_915GM)||((dinfo)->chipset == INTEL_945G)||(dinfo->chipset==INTEL_945GM))
#ifndef FBIO_WAITFORVSYNC
#define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
#endif
/*** function prototypes ***/
extern int intelfb_var_to_depth(const struct fb_var_screeninfo *var);

13
drivers/video/intelfb/intelfbdrv.c
View File

@ -1473,6 +1473,19 @@ static int
intelfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
{
int retval = 0;
struct intelfb_info *dinfo = GET_DINFO(info);
u32 pipe = 0;
switch (cmd) {
case FBIO_WAITFORVSYNC:
if (get_user(pipe, (__u32 __user *)arg))
return -EFAULT;
retval = intelfbhw_wait_for_vsync(dinfo, pipe);
break;
default:
break;
}
return retval;
}

33
drivers/video/intelfb/intelfbhw.c
View File

@ -2019,3 +2019,36 @@ intelfbhw_disable_irq(struct intelfb_info *dinfo) {
free_irq(dinfo->pdev->irq, dinfo);
}
}
int
intelfbhw_wait_for_vsync(struct intelfb_info *dinfo, u32 pipe) {
struct intelfb_vsync *vsync;
unsigned int count;
int ret;
switch (pipe) {
case 0:
vsync = &dinfo->vsync;
break;
default:
return -ENODEV;
}
ret = intelfbhw_enable_irq(dinfo, 0);
if (ret) {
return ret;
}
count = vsync->count;
ret = wait_event_interruptible_timeout(vsync->wait, count != vsync->count, HZ/10);
if (ret < 0) {
return ret;
}
if (ret == 0) {
intelfbhw_enable_irq(dinfo, 1);
DBG_MSG("wait_for_vsync timed out!\n");
return -ETIMEDOUT;
}
return 0;
}

1
drivers/video/intelfb/intelfbhw.h
View File

@ -563,5 +563,6 @@ extern void intelfbhw_cursor_load(struct intelfb_info *dinfo, int width,
extern void intelfbhw_cursor_reset(struct intelfb_info *dinfo);
extern int intelfbhw_enable_irq(struct intelfb_info *dinfo, int reenable);
extern void intelfbhw_disable_irq(struct intelfb_info *dinfo);
extern int intelfbhw_wait_for_vsync(struct intelfb_info *dinfo, u32 pipe);
#endif /* _INTELFBHW_H */