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>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c
index 068c56d4e652..08f8241bb92a 100644
--- a/drivers/video/intelfb/intelfbdrv.c
+++ b/drivers/video/intelfb/intelfbdrv.c
@@ -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;
 }