cx18: Major rewrite of interrupt handling for incoming mailbox processing

From: Andy Walls <awalls@radix.net>

A major rewrite of interrupt handling for incoming mailbox processing, to split
the timing critical steps from the the deferrable steps as the sending XPU on
the CX23418 will time out and overwrite our incoming mailboxes rather quickly.
Setup a pool of work "order forms" for the irq handler to send jobs to the new
work handler routine which uses the kernel default work queue to do the
deferrable work.  Started optimizing some of the cx18-io calls as they are now
the low hanging fruit for recoving microseconds back from the timeline.
Future optimizations will get rid of mmio read retries, mmio stats logging, and
combine smaller functions in the irq path into the larger ones to save ~2 us
each.

Priority: normal

Signed-off-by: Andy Walls <awalls@radix.net>

1 files changed, 9 insertions, 2 deletions

diff --git a/linux/drivers/media/video/cx18/cx18-driver.c b/linux/drivers/media/video/cx18/cx18-driver.c
index 54f0fde42..725ed2847 100644
--- a/linux/drivers/media/video/cx18/cx18-driver.c
+++ b/linux/drivers/media/video/cx18/cx18-driver.c
@@ -440,6 +440,8 @@ done:
  */
 static int __devinit cx18_init_struct1(struct cx18 *cx)
 {
+	int i;
+
 	cx->base_addr = pci_resource_start(cx->dev, 0);
 
 	mutex_init(&cx->serialize_lock);
@@ -451,11 +453,16 @@ static int __devinit cx18_init_struct1(struct cx18 *cx)
 
 	spin_lock_init(&cx->lock);
 
+	for (i = 0; i < CX18_MAX_EPU_WORK_ORDERS; i++) {
+		cx->epu_work_order[i].cx = cx;
+		cx->epu_work_order[i].str = cx->epu_debug_str;
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
-	INIT_WORK(&cx->work, cx18_work_handler);
+		INIT_WORK(&cx->epu_work_order[i].work, cx18_epu_work_handler);
 #else
-	INIT_WORK(&cx->work, cx18_work_handler, cx);
+		INIT_WORK(&cx->epu_work_order[i].work, cx18_epu_work_handler,
+			  &cx->epu_work_order[i].work);
 #endif
+	}
 
 	/* start counting open_id at 1 */
 	cx->open_id = 1;