V4L/DVB (9724): cx18: Streamline cx18-io[ch] wrappers and enforce MMIO retry strategy

cx18: Streamline cx18-io[ch] wrappers and enforce MMIO retry strategy so that
write retries always occur and read retries never occur (as they never help).
Remove MMIO statistics logging to speed up MMIO accesses.  Deprecate & ignore
retry_mmio and mmio_ndelay module parameters, to essentially force
retry_mmio=1 and mmio_ndelay=0.

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

1 files changed, 0 insertions, 13 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index 749bbb60a292..02a82c3b7a32 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -64,9 +64,6 @@
 #  error "This driver requires kernel PCI support."
 #endif
 
-/* Default delay to throttle mmio access to the CX23418 */
-#define CX18_DEFAULT_MMIO_NDELAY 0 /* 0 ns = 0 PCI clock(s) / 33 MHz */
-
 #define CX18_MEM_OFFSET 0x00000000
 #define CX18_MEM_SIZE   0x04000000
 #define CX18_REG_OFFSET 0x02000000
@@ -176,7 +173,6 @@
 
 #define CX18_MAX_PGM_INDEX (400)
 
-extern int cx18_retry_mmio;     /* enable check & retry of mmio accesses */
 extern int cx18_debug;
 
 
@@ -185,7 +181,6 @@ struct cx18_options {
         int cardtype;           /* force card type on load */
         int tuner;              /* set tuner on load */
         int radio;              /* enable/disable radio */
-        unsigned long mmio_ndelay; /* delay in ns after every PCI mmio access */
 };
 
 /* per-buffer bit flags */
@@ -371,13 +366,6 @@ struct cx18_i2c_algo_callback_data {
 };
 
 #define CX18_MAX_MMIO_WR_RETRIES 10
-#define CX18_MAX_MMIO_RD_RETRIES  2
-
-struct cx18_mmio_stats {
-        atomic_t retried_write[CX18_MAX_MMIO_WR_RETRIES+1];
-        atomic_t retried_read[CX18_MAX_MMIO_RD_RETRIES+1];
-};
-
 #define CX18_MAX_MB_ACK_DELAY 100
 
 struct cx18_mbox_stats {
@@ -475,7 +463,6 @@ struct cx18 {
         struct mutex gpio_lock;
 
         /* Statistics */
-        struct cx18_mmio_stats mmio_stats;
         struct cx18_mbox_stats mbox_stats;
 
         /* v4l2 and User settings */