V4L/DVB (9110): cx18: Add default behavior of checking and retrying PCI MMIO accesses

cx18: Add default behavior of checking and retrying PCI MMIO accesses.
The concept of checking and retrying PCI MMIO accesses for better reliability
in older motherboards was suggested by Steve Toth <stoth@linuxtv.org>.  This
change implements MMIO retries and the retry_mmio module parameter that is
enabled by default.  Limited experiments have shown this is more reliable than
the mmio_ndelay parameter.  mmio_ndelay has insignificant effect with retries
enabled.

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

8 files changed, 427 insertions, 36 deletions

diff --git a/drivers/media/video/cx18/cx18-av-core.c b/drivers/media/video/cx18/cx18-av-core.c
index d8626e354651..73f5141a42d1 100644
--- a/drivers/media/video/cx18/cx18-av-core.c
+++ b/drivers/media/video/cx18/cx18-av-core.c
@@ -42,6 +42,12 @@ int cx18_av_write4(struct cx18 *cx, u16 addr, u32 value)
         return 0;
 }
 
+int cx18_av_write4_noretry(struct cx18 *cx, u16 addr, u32 value)
+{
+        cx18_write_reg_noretry(cx, value, 0xc40000 + addr);
+        return 0;
+}
+
 u8 cx18_av_read(struct cx18 *cx, u16 addr)
 {
         u32 x = cx18_read_reg(cx, 0xc40000 + (addr & ~3));
@@ -55,6 +61,11 @@ u32 cx18_av_read4(struct cx18 *cx, u16 addr)
         return cx18_read_reg(cx, 0xc40000 + addr);
 }
 
+u32 cx18_av_read4_noretry(struct cx18 *cx, u16 addr)
+{
+        return cx18_read_reg_noretry(cx, 0xc40000 + addr);
+}
+
 int cx18_av_and_or(struct cx18 *cx, u16 addr, unsigned and_mask,
                    u8 or_value)
 {
diff --git a/drivers/media/video/cx18/cx18-av-core.h b/drivers/media/video/cx18/cx18-av-core.h
index eb61fa1e0965..b67d8df20cc6 100644
--- a/drivers/media/video/cx18/cx18-av-core.h
+++ b/drivers/media/video/cx18/cx18-av-core.h
@@ -301,8 +301,10 @@ struct cx18_av_state {
 /* cx18_av-core.c                                                          */
 int cx18_av_write(struct cx18 *cx, u16 addr, u8 value);
 int cx18_av_write4(struct cx18 *cx, u16 addr, u32 value);
+int cx18_av_write4_noretry(struct cx18 *cx, u16 addr, u32 value);
 u8 cx18_av_read(struct cx18 *cx, u16 addr);
 u32 cx18_av_read4(struct cx18 *cx, u16 addr);
+u32 cx18_av_read4_noretry(struct cx18 *cx, u16 addr);
 int cx18_av_and_or(struct cx18 *cx, u16 addr, unsigned mask, u8 value);
 int cx18_av_and_or4(struct cx18 *cx, u16 addr, u32 mask, u32 value);
 int cx18_av_cmd(struct cx18 *cx, unsigned int cmd, void *arg);
diff --git a/drivers/media/video/cx18/cx18-av-firmware.c b/drivers/media/video/cx18/cx18-av-firmware.c
index 0488b6297704..522a035b2e8f 100644
--- a/drivers/media/video/cx18/cx18-av-firmware.c
+++ b/drivers/media/video/cx18/cx18-av-firmware.c
@@ -50,7 +50,7 @@ int cx18_av_loadfw(struct cx18 *cx)
                 cx18_av_write4(cx, 0x8100, 0x00010000);
 
                 /* Put the 8051 in reset and enable firmware upload */
-                cx18_av_write4(cx, CXADEC_DL_CTL, 0x0F000000);
+                cx18_av_write4_noretry(cx, CXADEC_DL_CTL, 0x0F000000);
 
                 ptr = fw->data;
                 size = fw->size;
@@ -59,22 +59,28 @@ int cx18_av_loadfw(struct cx18 *cx)
                         u32 dl_control = 0x0F000000 | i | ((u32)ptr[i] << 16);
                         u32 value = 0;
                         int retries2;
+                        int unrec_err = 0;
 
-                        for (retries2 = 0; retries2 < 5; retries2++) {
-                                cx18_av_write4(cx, CXADEC_DL_CTL, dl_control);
+                        for (retries2 = 0; retries2 < CX18_MAX_MMIO_RETRIES;
+                             retries2++) {
+                                cx18_av_write4_noretry(cx, CXADEC_DL_CTL,
+                                                       dl_control);
                                 udelay(10);
-                                value = cx18_av_read4(cx, CXADEC_DL_CTL);
+                                value = cx18_av_read4_noretry(cx,
+                                                              CXADEC_DL_CTL);
                                 if (value == dl_control)
                                         break;
                                 /* Check if we can correct the byte by changing
                                    the address.  We can only write the lower
                                    address byte of the address. */
                                 if ((value & 0x3F00) != (dl_control & 0x3F00)) {
-                                        retries2 = 5;
+                                        unrec_err = 1;
                                         break;
                                 }
                         }
-                        if (retries2 >= 5)
+                        cx18_log_write_retries(cx, retries2,
+                                        cx->reg_mem + 0xc40000 + CXADEC_DL_CTL);
+                        if (unrec_err || retries2 >= CX18_MAX_MMIO_RETRIES)
                                 break;
                 }
                 if (i == size)
diff --git a/drivers/media/video/cx18/cx18-driver.c b/drivers/media/video/cx18/cx18-driver.c
index 4de7b501f207..df5531709ae5 100644
--- a/drivers/media/video/cx18/cx18-driver.c
+++ b/drivers/media/video/cx18/cx18-driver.c
@@ -96,6 +96,7 @@ static int enc_pcm_buffers = CX18_DEFAULT_ENC_PCM_BUFFERS;
 
 static int cx18_pci_latency = 1;
 
+int cx18_retry_mmio = 1;
 int cx18_debug;
 
 module_param_array(tuner, int, &tuner_c, 0644);
@@ -106,6 +107,7 @@ module_param_string(pal, pal, sizeof(pal), 0644);
 module_param_string(secam, secam, sizeof(secam), 0644);
 module_param_string(ntsc, ntsc, sizeof(ntsc), 0644);
 module_param_named(debug, cx18_debug, int, 0644);
+module_param_named(retry_mmio, cx18_retry_mmio, int, 0644);
 module_param(cx18_pci_latency, int, 0644);
 module_param(cx18_first_minor, int, 0644);
 
@@ -147,6 +149,9 @@ MODULE_PARM_DESC(debug,
 MODULE_PARM_DESC(cx18_pci_latency,
                  "Change the PCI latency to 64 if lower: 0 = No, 1 = Yes,\n"
                  "\t\t\tDefault: Yes");
+MODULE_PARM_DESC(retry_mmio,
+                 "Check and retry memory mapped IO accesses\n"
+                 "\t\t\tDefault: 1 [Yes]");
 MODULE_PARM_DESC(mmio_ndelay,
                  "Delay (ns) for each CX23418 memory mapped IO access.\n"
                  "\t\t\tTry larger values that are close to a multiple of the\n"
@@ -827,6 +832,7 @@ err:
         if (retval == 0)
                 retval = -ENODEV;
         CX18_ERR("Error %d on initialization\n", retval);
+        cx18_log_statistics(cx);
 
         kfree(cx18_cards[cx18_cards_active]);
         cx18_cards[cx18_cards_active] = NULL;
@@ -931,6 +937,7 @@ static void cx18_remove(struct pci_dev *pci_dev)
 
         pci_disable_device(cx->dev);
 
+        cx18_log_statistics(cx);
         CX18_INFO("Removed %s, card #%d\n", cx->card_name, cx->num);
 }
 
diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index 66cb748875c7..80f5f563d4fc 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -171,6 +171,7 @@
 
 #define CX18_MAX_PGM_INDEX (400)
 
+extern int cx18_retry_mmio;     /* enable check & retry of mmio accesses */
 extern int cx18_debug;
 
 
@@ -344,6 +345,13 @@ struct cx18_i2c_algo_callback_data {
         int bus_index;   /* 0 or 1 for the cx23418's 1st or 2nd I2C bus */
 };
 
+#define CX18_MAX_MMIO_RETRIES 10
+
+struct cx18_mmio_stats {
+        atomic_t retried_write[CX18_MAX_MMIO_RETRIES+1];
+        atomic_t retried_read[CX18_MAX_MMIO_RETRIES+1];
+};
+
 /* Struct to hold info about cx18 cards */
 struct cx18 {
         int num;                /* board number, -1 during init! */
@@ -433,6 +441,9 @@ struct cx18 {
         u32 gpio_val;
         struct mutex gpio_lock;
 
+        /* Statistics */
+        struct cx18_mmio_stats mmio_stats;
+
         /* v4l2 and User settings */
 
         /* codec settings */
diff --git a/drivers/media/video/cx18/cx18-io.c b/drivers/media/video/cx18/cx18-io.c
index 55d1df93292a..700ab9439c16 100644
--- a/drivers/media/video/cx18/cx18-io.c
+++ b/drivers/media/video/cx18/cx18-io.c
@@ -24,6 +24,131 @@
 #include "cx18-io.h"
 #include "cx18-irq.h"
 
+void cx18_log_statistics(struct cx18 *cx)
+{
+        int i;
+
+        if (!(cx18_debug & CX18_DBGFLG_INFO))
+                return;
+
+        for (i = 0; i <= CX18_MAX_MMIO_RETRIES; i++)
+                CX18_DEBUG_INFO("retried_write[%d] = %d\n", i,
+                                atomic_read(&cx->mmio_stats.retried_write[i]));
+        for (i = 0; i <= CX18_MAX_MMIO_RETRIES; i++)
+                CX18_DEBUG_INFO("retried_read[%d] = %d\n", i,
+                                atomic_read(&cx->mmio_stats.retried_read[i]));
+        return;
+}
+
+void cx18_raw_writel_retry(struct cx18 *cx, u32 val, void __iomem *addr)
+{
+        int i;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                cx18_raw_writel_noretry(cx, val, addr);
+                if (val == cx18_raw_readl_noretry(cx, addr))
+                        break;
+        }
+        cx18_log_write_retries(cx, i, addr);
+}
+
+u32 cx18_raw_readl_retry(struct cx18 *cx, const void __iomem *addr)
+{
+        int i;
+        u32 val;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                val = cx18_raw_readl_noretry(cx, addr);
+                if (val != 0xffffffff) /* PCI bus read error */
+                        break;
+        }
+        cx18_log_read_retries(cx, i, addr);
+        return val;
+}
+
+u16 cx18_raw_readw_retry(struct cx18 *cx, const void __iomem *addr)
+{
+        int i;
+        u16 val;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                val = cx18_raw_readw_noretry(cx, addr);
+                if (val != 0xffff) /* PCI bus read error */
+                        break;
+        }
+        cx18_log_read_retries(cx, i, addr);
+        return val;
+}
+
+void cx18_writel_retry(struct cx18 *cx, u32 val, void __iomem *addr)
+{
+        int i;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                cx18_writel_noretry(cx, val, addr);
+                if (val == cx18_readl_noretry(cx, addr))
+                        break;
+        }
+        cx18_log_write_retries(cx, i, addr);
+}
+
+void cx18_writew_retry(struct cx18 *cx, u16 val, void __iomem *addr)
+{
+        int i;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                cx18_writew_noretry(cx, val, addr);
+                if (val == cx18_readw_noretry(cx, addr))
+                        break;
+        }
+        cx18_log_write_retries(cx, i, addr);
+}
+
+void cx18_writeb_retry(struct cx18 *cx, u8 val, void __iomem *addr)
+{
+        int i;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                cx18_writeb_noretry(cx, val, addr);
+                if (val == cx18_readb_noretry(cx, addr))
+                        break;
+        }
+        cx18_log_write_retries(cx, i, addr);
+}
+
+u32 cx18_readl_retry(struct cx18 *cx, const void __iomem *addr)
+{
+        int i;
+        u32 val;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                val = cx18_readl_noretry(cx, addr);
+                if (val != 0xffffffff) /* PCI bus read error */
+                        break;
+        }
+        cx18_log_read_retries(cx, i, addr);
+        return val;
+}
+
+u16 cx18_readw_retry(struct cx18 *cx, const void __iomem *addr)
+{
+        int i;
+        u16 val;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                val = cx18_readw_noretry(cx, addr);
+                if (val != 0xffff) /* PCI bus read error */
+                        break;
+        }
+        cx18_log_read_retries(cx, i, addr);
+        return val;
+}
+
+u8 cx18_readb_retry(struct cx18 *cx, const void __iomem *addr)
+{
+        int i;
+        u8 val;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                val = cx18_readb_noretry(cx, addr);
+                if (val != 0xff) /* PCI bus read error */
+                        break;
+        }
+        cx18_log_read_retries(cx, i, addr);
+        return val;
+}
+
 void cx18_memcpy_fromio(struct cx18 *cx, void *to,
                         const void __iomem *from, unsigned int len)
 {
@@ -127,13 +252,3 @@ void cx18_setup_page(struct cx18 *cx, u32 addr)
         val = (val & ~0x1f00) | ((addr >> 17) & 0x1f00);
         cx18_write_reg(cx, val, 0xD000F8);
 }
-
-/* Tries to recover from the CX23418 responding improperly on the PCI bus */
-int cx18_pci_try_recover(struct cx18 *cx)
-{
-        u16 status;
-
-        pci_read_config_word(cx->dev, PCI_STATUS, &status);
-        pci_write_config_word(cx->dev, PCI_STATUS, status);
-        return 0;
-}
diff --git a/drivers/media/video/cx18/cx18-io.h b/drivers/media/video/cx18/cx18-io.h
index 7ab7be2531ca..197d4fbd9f95 100644
--- a/drivers/media/video/cx18/cx18-io.h
+++ b/drivers/media/video/cx18/cx18-io.h
@@ -31,102 +31,343 @@ static inline void cx18_io_delay(struct cx18 *cx)
                 ndelay(cx->options.mmio_ndelay);
 }
 
+/*
+ * Readback and retry of MMIO access for reliability:
+ * The concept was suggested by Steve Toth <stoth@linuxtv.org>.
+ * The implmentation is the fault of Andy Walls <awalls@radix.net>.
+ */
+
+/* Statistics gathering */
+static inline
+void cx18_log_write_retries(struct cx18 *cx, int i, const void *addr)
+{
+        if (i > CX18_MAX_MMIO_RETRIES)
+                i = CX18_MAX_MMIO_RETRIES;
+        atomic_inc(&cx->mmio_stats.retried_write[i]);
+        return;
+}
+
+static inline
+void cx18_log_read_retries(struct cx18 *cx, int i, const void *addr)
+{
+        if (i > CX18_MAX_MMIO_RETRIES)
+                i = CX18_MAX_MMIO_RETRIES;
+        atomic_inc(&cx->mmio_stats.retried_read[i]);
+        return;
+}
+
+void cx18_log_statistics(struct cx18 *cx);
+
 /* Non byteswapping memory mapped IO */
-static inline void cx18_raw_writel(struct cx18 *cx, u32 val, void __iomem *addr)
+static inline
+void cx18_raw_writel_noretry(struct cx18 *cx, u32 val, void __iomem *addr)
 {
         __raw_writel(val, addr);
         cx18_io_delay(cx);
 }
 
-static inline u32 cx18_raw_readl(struct cx18 *cx, const void __iomem *addr)
+void cx18_raw_writel_retry(struct cx18 *cx, u32 val, void __iomem *addr);
+
+static inline void cx18_raw_writel(struct cx18 *cx, u32 val, void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                cx18_raw_writel_retry(cx, val, addr);
+        else
+                cx18_raw_writel_noretry(cx, val, addr);
+}
+
+
+static inline
+u32 cx18_raw_readl_noretry(struct cx18 *cx, const void __iomem *addr)
 {
         u32 ret = __raw_readl(addr);
         cx18_io_delay(cx);
         return ret;
 }
 
-static inline u16 cx18_raw_readw(struct cx18 *cx, const void __iomem *addr)
+u32 cx18_raw_readl_retry(struct cx18 *cx, const void __iomem *addr);
+
+static inline u32 cx18_raw_readl(struct cx18 *cx, const void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                return cx18_raw_readl_retry(cx, addr);
+
+        return cx18_raw_readl_noretry(cx, addr);
+}
+
+
+static inline
+u16 cx18_raw_readw_noretry(struct cx18 *cx, const void __iomem *addr)
 {
         u16 ret = __raw_readw(addr);
         cx18_io_delay(cx);
         return ret;
 }
 
+u16 cx18_raw_readw_retry(struct cx18 *cx, const void __iomem *addr);
+
+static inline u16 cx18_raw_readw(struct cx18 *cx, const void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                return cx18_raw_readw_retry(cx, addr);
+
+        return cx18_raw_readw_noretry(cx, addr);
+}
+
+
 /* Normal memory mapped IO */
-static inline void cx18_writel(struct cx18 *cx, u32 val, void __iomem *addr)
+static inline
+void cx18_writel_noretry(struct cx18 *cx, u32 val, void __iomem *addr)
 {
         writel(val, addr);
         cx18_io_delay(cx);
 }
 
-static inline void cx18_writew(struct cx18 *cx, u16 val, void __iomem *addr)
+void cx18_writel_retry(struct cx18 *cx, u32 val, void __iomem *addr);
+
+static inline void cx18_writel(struct cx18 *cx, u32 val, void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                cx18_writel_retry(cx, val, addr);
+        else
+                cx18_writel_noretry(cx, val, addr);
+}
+
+
+static inline
+void cx18_writew_noretry(struct cx18 *cx, u16 val, void __iomem *addr)
 {
         writew(val, addr);
         cx18_io_delay(cx);
 }
 
-static inline void cx18_writeb(struct cx18 *cx, u8 val, void __iomem *addr)
+void cx18_writew_retry(struct cx18 *cx, u16 val, void __iomem *addr);
+
+static inline void cx18_writew(struct cx18 *cx, u16 val, void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                cx18_writew_retry(cx, val, addr);
+        else
+                cx18_writew_noretry(cx, val, addr);
+}
+
+
+static inline
+void cx18_writeb_noretry(struct cx18 *cx, u8 val, void __iomem *addr)
 {
         writeb(val, addr);
         cx18_io_delay(cx);
 }
 
-static inline u32 cx18_readl(struct cx18 *cx, const void __iomem *addr)
+void cx18_writeb_retry(struct cx18 *cx, u8 val, void __iomem *addr);
+
+static inline void cx18_writeb(struct cx18 *cx, u8 val, void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                cx18_writeb_retry(cx, val, addr);
+        else
+                cx18_writeb_noretry(cx, val, addr);
+}
+
+
+static inline u32 cx18_readl_noretry(struct cx18 *cx, const void __iomem *addr)
 {
         u32 ret = readl(addr);
         cx18_io_delay(cx);
         return ret;
 }
 
-static inline u8 cx18_readb(struct cx18 *cx, const void __iomem *addr)
+u32 cx18_readl_retry(struct cx18 *cx, const void __iomem *addr);
+
+static inline u32 cx18_readl(struct cx18 *cx, const void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                return cx18_readl_retry(cx, addr);
+
+        return cx18_readl_noretry(cx, addr);
+}
+
+
+static inline u16 cx18_readw_noretry(struct cx18 *cx, const void __iomem *addr)
+{
+        u16 ret = readw(addr);
+        cx18_io_delay(cx);
+        return ret;
+}
+
+u16 cx18_readw_retry(struct cx18 *cx, const void __iomem *addr);
+
+static inline u16 cx18_readw(struct cx18 *cx, const void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                return cx18_readw_retry(cx, addr);
+
+        return cx18_readw_noretry(cx, addr);
+}
+
+
+static inline u8 cx18_readb_noretry(struct cx18 *cx, const void __iomem *addr)
 {
         u8 ret = readb(addr);
         cx18_io_delay(cx);
         return ret;
 }
 
+u8 cx18_readb_retry(struct cx18 *cx, const void __iomem *addr);
+
+static inline u8 cx18_readb(struct cx18 *cx, const void __iomem *addr)
+{
+        if (cx18_retry_mmio)
+                return cx18_readb_retry(cx, addr);
+
+        return cx18_readb_noretry(cx, addr);
+}
+
+
+static inline
+u32 cx18_write_sync_noretry(struct cx18 *cx, u32 val, void __iomem *addr)
+{
+        cx18_writel_noretry(cx, val, addr);
+        return cx18_readl_noretry(cx, addr);
+}
+
+static inline
+u32 cx18_write_sync_retry(struct cx18 *cx, u32 val, void __iomem *addr)
+{
+        cx18_writel_retry(cx, val, addr);
+        return cx18_readl_retry(cx, addr);
+}
+
 static inline u32 cx18_write_sync(struct cx18 *cx, u32 val, void __iomem *addr)
 {
-        cx18_writel(cx, val, addr);
-        return cx18_readl(cx, addr);
+        if (cx18_retry_mmio)
+                return cx18_write_sync_retry(cx, val, addr);
+
+        return cx18_write_sync_noretry(cx, val, addr);
 }
 
+
 void cx18_memcpy_fromio(struct cx18 *cx, void *to,
                         const void __iomem *from, unsigned int len);
 void cx18_memset_io(struct cx18 *cx, void __iomem *addr, int val, size_t count);
 
+
 /* Access "register" region of CX23418 memory mapped I/O */
+static inline void cx18_write_reg_noretry(struct cx18 *cx, u32 val, u32 reg)
+{
+        cx18_writel_noretry(cx, val, cx->reg_mem + reg);
+}
+
+static inline void cx18_write_reg_retry(struct cx18 *cx, u32 val, u32 reg)
+{
+        cx18_writel_retry(cx, val, cx->reg_mem + reg);
+}
+
 static inline void cx18_write_reg(struct cx18 *cx, u32 val, u32 reg)
 {
-        cx18_writel(cx, val, cx->reg_mem + reg);
+        if (cx18_retry_mmio)
+                cx18_write_reg_retry(cx, val, reg);
+        else
+                cx18_write_reg_noretry(cx, val, reg);
+}
+
+
+static inline u32 cx18_read_reg_noretry(struct cx18 *cx, u32 reg)
+{
+        return cx18_readl_noretry(cx, cx->reg_mem + reg);
+}
+
+static inline u32 cx18_read_reg_retry(struct cx18 *cx, u32 reg)
+{
+        return cx18_readl_retry(cx, cx->reg_mem + reg);
 }
 
 static inline u32 cx18_read_reg(struct cx18 *cx, u32 reg)
 {
-        return cx18_readl(cx, cx->reg_mem + reg);
+        if (cx18_retry_mmio)
+                return cx18_read_reg_retry(cx, reg);
+
+        return cx18_read_reg_noretry(cx, reg);
+}
+
+
+static inline u32 cx18_write_reg_sync_noretry(struct cx18 *cx, u32 val, u32 reg)
+{
+        return cx18_write_sync_noretry(cx, val, cx->reg_mem + reg);
+}
+
+static inline u32 cx18_write_reg_sync_retry(struct cx18 *cx, u32 val, u32 reg)
+{
+        return cx18_write_sync_retry(cx, val, cx->reg_mem + reg);
 }
 
 static inline u32 cx18_write_reg_sync(struct cx18 *cx, u32 val, u32 reg)
 {
-        return cx18_write_sync(cx, val, cx->reg_mem + reg);
+        if (cx18_retry_mmio)
+                return cx18_write_reg_sync_retry(cx, val, reg);
+
+        return cx18_write_reg_sync_noretry(cx, val, reg);
 }
 
+
 /* Access "encoder memory" region of CX23418 memory mapped I/O */
+static inline void cx18_write_enc_noretry(struct cx18 *cx, u32 val, u32 addr)
+{
+        cx18_writel_noretry(cx, val, cx->enc_mem + addr);
+}
+
+static inline void cx18_write_enc_retry(struct cx18 *cx, u32 val, u32 addr)
+{
+        cx18_writel_retry(cx, val, cx->enc_mem + addr);
+}
+
 static inline void cx18_write_enc(struct cx18 *cx, u32 val, u32 addr)
 {
-        cx18_writel(cx, val, cx->enc_mem + addr);
+        if (cx18_retry_mmio)
+                cx18_write_enc_retry(cx, val, addr);
+        else
+                cx18_write_enc_noretry(cx, val, addr);
+}
+
+
+static inline u32 cx18_read_enc_noretry(struct cx18 *cx, u32 addr)
+{
+        return cx18_readl_noretry(cx, cx->enc_mem + addr);
+}
+
+static inline u32 cx18_read_enc_retry(struct cx18 *cx, u32 addr)
+{
+        return cx18_readl_retry(cx, cx->enc_mem + addr);
 }
 
 static inline u32 cx18_read_enc(struct cx18 *cx, u32 addr)
 {
-        return cx18_readl(cx, cx->enc_mem + addr);
+        if (cx18_retry_mmio)
+                return cx18_read_enc_retry(cx, addr);
+
+        return cx18_read_enc_noretry(cx, addr);
+}
+
+static inline
+u32 cx18_write_enc_sync_noretry(struct cx18 *cx, u32 val, u32 addr)
+{
+        return cx18_write_sync_noretry(cx, val, cx->enc_mem + addr);
 }
 
-static inline u32 cx18_write_enc_sync(struct cx18 *cx, u32 val, u32 addr)
+static inline
+u32 cx18_write_enc_sync_retry(struct cx18 *cx, u32 val, u32 addr)
 {
-        return cx18_write_sync(cx, val, cx->enc_mem + addr);
+        return cx18_write_sync_retry(cx, val, cx->enc_mem + addr);
 }
 
+static inline
+u32 cx18_write_enc_sync(struct cx18 *cx, u32 val, u32 addr)
+{
+        if (cx18_retry_mmio)
+                return cx18_write_enc_sync_retry(cx, val, addr);
+
+        return cx18_write_enc_sync_noretry(cx, val, addr);
+}
 
 void cx18_sw1_irq_enable(struct cx18 *cx, u32 val);
 void cx18_sw1_irq_disable(struct cx18 *cx, u32 val);
@@ -134,7 +375,4 @@ void cx18_sw2_irq_enable(struct cx18 *cx, u32 val);
 void cx18_sw2_irq_disable(struct cx18 *cx, u32 val);
 void cx18_setup_page(struct cx18 *cx, u32 addr);
 
-/* Tries to recover from the CX23418 responding improperly on the PCI bus */
-int cx18_pci_try_recover(struct cx18 *cx);
-
 #endif /* CX18_IO_H */
diff --git a/drivers/media/video/cx18/cx18-ioctl.c b/drivers/media/video/cx18/cx18-ioctl.c
index 4a47f61d9486..83aa9cb02e00 100644
--- a/drivers/media/video/cx18/cx18-ioctl.c
+++ b/drivers/media/video/cx18/cx18-ioctl.c
@@ -752,6 +752,7 @@ static int cx18_log_status(struct file *file, void *fh)
         CX18_INFO("Read MPEG/VBI: %lld/%lld bytes\n",
                         (long long)cx->mpg_data_received,
                         (long long)cx->vbi_data_inserted);
+        cx18_log_statistics(cx);
         CX18_INFO("==================  END STATUS CARD #%d  ==================\n", cx->num);
         return 0;
 }