firewire: fw-ohci: log regAccessFail events

While trying to debug this piece of crap JMicron PCI-e controller in my
possession, one thought was that perhaps I was encountering register access
failures. I'm not, but logging them would be good, so we can see if they
are a real problem we should be taking into account anywhere in the code.

Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (added list contact)

2 files changed, 11 insertions, 3 deletions

diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index e88260b67611..ce18bab3f9d5 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -257,7 +257,7 @@ static void log_irqs(u32 evt)
         if (likely(!(param_debug & OHCI_PARAM_DEBUG_IRQS)))
                 return;
 
-        printk(KERN_DEBUG KBUILD_MODNAME ": IRQ %08x%s%s%s%s%s%s%s%s%s%s%s\n",
+        printk(KERN_DEBUG KBUILD_MODNAME ": IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s\n",
                evt,
                evt & OHCI1394_selfIDComplete    ? " selfID"             : "",
                evt & OHCI1394_RQPkt             ? " AR_req"             : "",
@@ -269,11 +269,13 @@ static void log_irqs(u32 evt)
                evt & OHCI1394_postedWriteErr    ? " postedWriteErr"     : "",
                evt & OHCI1394_cycleTooLong      ? " cycleTooLong"       : "",
                evt & OHCI1394_cycle64Seconds    ? " cycle64Seconds"     : "",
+               evt & OHCI1394_regAccessFail     ? " regAccessFail"      : "",
                evt & ~(OHCI1394_selfIDComplete | OHCI1394_RQPkt |
                        OHCI1394_RSPkt | OHCI1394_reqTxComplete |
                        OHCI1394_respTxComplete | OHCI1394_isochRx |
                        OHCI1394_isochTx | OHCI1394_postedWriteErr |
-                       OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds)
+                       OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds |
+                       OHCI1394_regAccessFail)
                                                 ? " ?"                  : "");
 }
 
@@ -1351,6 +1353,10 @@ static irqreturn_t irq_handler(int irq, void *data)
                 iso_event &= ~(1 << i);
         }
 
+        if (unlikely(event & OHCI1394_regAccessFail))
+                fw_error("Register access failure - "
+                         "please notify linux1394-devel@lists.sf.net\n");
+
         if (unlikely(event & OHCI1394_postedWriteErr))
                 fw_error("PCI posted write error\n");
 
@@ -1448,7 +1454,8 @@ static int ohci_enable(struct fw_card *card, u32 *config_rom, size_t length)
                   OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
                   OHCI1394_isochRx | OHCI1394_isochTx |
                   OHCI1394_postedWriteErr | OHCI1394_cycleTooLong |
-                  OHCI1394_cycle64Seconds | OHCI1394_masterIntEnable);
+                  OHCI1394_cycle64Seconds | OHCI1394_regAccessFail |
+                  OHCI1394_masterIntEnable);
 
         /* Activate link_on bit and contender bit in our self ID packets.*/
         if (ohci_update_phy_reg(card, 4, 0,
diff --git a/drivers/firewire/fw-ohci.h b/drivers/firewire/fw-ohci.h
index 5754c6e9d595..a2fbb6240ca7 100644
--- a/drivers/firewire/fw-ohci.h
+++ b/drivers/firewire/fw-ohci.h
@@ -125,6 +125,7 @@
 #define OHCI1394_lockRespErr            0x00000200
 #define OHCI1394_selfIDComplete         0x00010000
 #define OHCI1394_busReset               0x00020000
+#define OHCI1394_regAccessFail          0x00040000
 #define OHCI1394_phy                    0x00080000
 #define OHCI1394_cycleSynch             0x00100000
 #define OHCI1394_cycle64Seconds         0x00200000