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| author | Jay Fenlason <fenlason@redhat.com> | 2009-11-17 12:29:17 -0500 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-11-18 20:31:17 +0100 |
| commit | 5ed1f321a71b8549cc2eea26c94fe7943ed01d31 (patch) | |
| tree | c27a802d0feed854a4842805d041bcb44d362f10 /drivers/firewire | |
| parent | eaf76e0d027a917a013ad8a88a94132d0feab622 (diff) | |
| download | linux-5ed1f321a71b8549cc2eea26c94fe7943ed01d31.tar.gz linux-5ed1f321a71b8549cc2eea26c94fe7943ed01d31.tar.bz2 linux-5ed1f321a71b8549cc2eea26c94fe7943ed01d31.zip | |
firewire: ohci: Make cycleMatch ISO transmission work
Calling the START_ISO ioctl with a nonnegative cycle paramater has
never worked. Last night I got around to figuring out why. Most of
this patch is a big comment explaining why we enable an interrupt
source then don't actually do anything when we get one. As the
comment says, we should do more, but we don't have a way to tell
userspace what happened. . .
Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (edited comment)
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/ohci.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 5d524254499e..c07cfada190a 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -275,7 +275,7 @@ static void log_irqs(u32 evt) !(evt & OHCI1394_busReset)) return; - fw_notify("IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s%s\n", evt, + fw_notify("IRQ %08x%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", evt, evt & OHCI1394_selfIDComplete ? " selfID" : "", evt & OHCI1394_RQPkt ? " AR_req" : "", evt & OHCI1394_RSPkt ? " AR_resp" : "", @@ -286,6 +286,7 @@ static void log_irqs(u32 evt) evt & OHCI1394_postedWriteErr ? " postedWriteErr" : "", evt & OHCI1394_cycleTooLong ? " cycleTooLong" : "", evt & OHCI1394_cycle64Seconds ? " cycle64Seconds" : "", + evt & OHCI1394_cycleInconsistent ? " cycleInconsistent" : "", evt & OHCI1394_regAccessFail ? " regAccessFail" : "", evt & OHCI1394_busReset ? " busReset" : "", evt & ~(OHCI1394_selfIDComplete | OHCI1394_RQPkt | @@ -293,6 +294,7 @@ static void log_irqs(u32 evt) OHCI1394_respTxComplete | OHCI1394_isochRx | OHCI1394_isochTx | OHCI1394_postedWriteErr | OHCI1394_cycleTooLong | OHCI1394_cycle64Seconds | + OHCI1394_cycleInconsistent | OHCI1394_regAccessFail | OHCI1394_busReset) ? " ?" : ""); } @@ -1439,6 +1441,17 @@ static irqreturn_t irq_handler(int irq, void *data) OHCI1394_LinkControl_cycleMaster); } + if (unlikely(event & OHCI1394_cycleInconsistent)) { + /* + * We need to clear this event bit in order to make + * cycleMatch isochronous I/O work. In theory we should + * stop active cycleMatch iso contexts now and restart + * them at least two cycles later. (FIXME?) + */ + if (printk_ratelimit()) + fw_notify("isochronous cycle inconsistent\n"); + } + if (event & OHCI1394_cycle64Seconds) { cycle_time = reg_read(ohci, OHCI1394_IsochronousCycleTimer); if ((cycle_time & 0x80000000) == 0) @@ -1528,6 +1541,7 @@ 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_cycleInconsistent | OHCI1394_cycle64Seconds | OHCI1394_regAccessFail | OHCI1394_masterIntEnable); if (param_debug & OHCI_PARAM_DEBUG_BUSRESETS) |