V4L/DVB (9720): cx18: Major rewrite of interrupt handling for incoming mailbox processing

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.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 0 insertions, 35 deletions

diff --git a/drivers/media/video/cx18/cx18-io.c b/drivers/media/video/cx18/cx18-io.c
index 3c6485fceea0..c67694f63d0e 100644
--- a/drivers/media/video/cx18/cx18-io.c
+++ b/drivers/media/video/cx18/cx18-io.c
@@ -166,41 +166,6 @@ u8 cx18_readb_retry(struct cx18 *cx, const void __iomem *addr)
         return val;
 }
 
-void cx18_memcpy_fromio(struct cx18 *cx, void *to,
-                        const void __iomem *from, unsigned int len)
-{
-        const u8 __iomem *src = from;
-        u8 *dst = to;
-
-        /* Align reads on the CX23418's addresses */
-        if ((len > 0) && ((unsigned long) src & 1)) {
-                *dst = cx18_readb(cx, src);
-                len--;
-                dst++;
-                src++;
-        }
-        if ((len > 1) && ((unsigned long) src & 2)) {
-                *((u16 *)dst) = cx18_raw_readw(cx, src);
-                len -= 2;
-                dst += 2;
-                src += 2;
-        }
-        while (len > 3) {
-                *((u32 *)dst) = cx18_raw_readl(cx, src);
-                len -= 4;
-                dst += 4;
-                src += 4;
-        }
-        if (len > 1) {
-                *((u16 *)dst) = cx18_raw_readw(cx, src);
-                len -= 2;
-                dst += 2;
-                src += 2;
-        }
-        if (len > 0)
-                *dst = cx18_readb(cx, src);
-}
-
 void cx18_memset_io(struct cx18 *cx, void __iomem *addr, int val, size_t count)
 {
         u8 __iomem *dst = addr;