intelfb: add vsync interrupt support
[03/05] intelfb: Implement basic interrupt handling
Functions have been added to enable and disable interrupts using the MMIO registers. Currently only pipe A vsync interrupts are enabled.
A generalized vsync accounting struct is defined, with the intent that it can encapsulate per-pipe vsync related info in the future. Currently a single instance is hard-coded.
The interrupt service routine currently only looks for vsync interrupts on pipe A, and increments a counter and wakes up anyone waiting on it.
This implementation is heavily influenced by similar implementations in the atyfb and matroxfb drivers.
Signed-off-by: Eric Hustvedt <ehustvedt@cecropia.com>
diff --git a/drivers/video/intelfb/intelfb.h b/drivers/video/intelfb/intelfb.h
index cb016fe..dab1f2d 100644
--- a/drivers/video/intelfb/intelfb.h
+++ b/drivers/video/intelfb/intelfb.h
@@ -208,6 +208,11 @@
u32 size; // in bytes
};
+struct intelfb_vsync {
+ wait_queue_head_t wait;
+ unsigned int count;
+};
+
struct intelfb_info {
struct fb_info *info;
struct fb_ops *fbops;
@@ -271,6 +276,12 @@
int fixed_mode;
int ring_active;
int flag;
+ unsigned long irq_flags;
+ int open;
+
+ /* vsync */
+ struct intelfb_vsync vsync;
+ spinlock_t int_lock;
/* hw cursor */
int cursor_on;