intelfb: add vsync interrupt support

[safe/jmp/linux-2.6] / drivers / video / intelfb / intelfbhw.c

diff --git a/drivers/video/intelfb/intelfbhw.c b/drivers/video/intelfb/intelfbhw.c
index 1a698a7..0f9631c 100644 (file)
--- a/drivers/video/intelfb/intelfbhw.c
+++ b/drivers/video/intelfb/intelfbhw.c
@@ -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;
+}