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, 1 insertions, 7 deletions

diff --git a/linux/drivers/media/video/cx18/cx18-scb.h b/linux/drivers/media/video/cx18/cx18-scb.h
index 594713bbe..29866f02f 100644
--- a/linux/drivers/media/video/cx18/cx18-scb.h
+++ b/linux/drivers/media/video/cx18/cx18-scb.h
@@ -85,12 +85,6 @@ struct cx18_mdl {
     u32 length; /* Length of the buffer segment */
 };
 
-/* This structure is used by CPU to provide completed buffers information */
-struct cx18_mdl_ack {
-    u32 id;        /* ID of a completed MDL */
-    u32 data_used; /* Total data filled in the MDL for buffer 'id' */
-};
-
 struct cx18_scb {
 	/* These fields form the System Control Block which is used at boot time
 	   for localizing the IPC data as well as the code positions for all
@@ -276,7 +270,7 @@ struct cx18_scb {
 	struct cx18_mailbox  hpu2epu_mb;
 	struct cx18_mailbox  ppu2epu_mb;
 
-	struct cx18_mdl_ack  cpu_mdl_ack[CX18_MAX_STREAMS][2];
+	struct cx18_mdl_ack  cpu_mdl_ack[CX18_MAX_STREAMS][CX18_MAX_MDL_ACKS];
 	struct cx18_mdl      cpu_mdl[1];
 };