[svn-commits] sruffell: linux/trunk r9542 - /linux/trunk/drivers/dahdi/voicebus/voicebus.c

[SVN commits to the Digium repositories]

Author: sruffell
Date: Wed Dec 15 12:54:49 2010
New Revision: 9542

URL: http://svnview.digium.com/svn/dahdi?view=rev&rev=9542
Log:
wctdm24xxp, wcte12xp: Disable PCI read-line multiple command.

There are some platforms where the read-line multiple transaction causes
packets to be dropped in the voicebus pipeline.  The only observable
behavior is that packets just go "missing" in the pipeline.  This also
only appears to affect PCI cards.

A typical 'symptom' of this problem is you may see IRQ misses increasing
without any corresponding "bumps" in latency in the kernel message log.
Normally, IRQ misses are correlated to latency bumps since that is an
indication that the host was not able to service the card interrupt in a
timely fashion. DAHDI-510 DAHDI-774

Signed-off-by: Shaun Ruffell <sruffell at digium.com>
Signed-off-by: Russ Meyerriecks <rmeyerriecks at digium.com>
Acked-by: Kinsey Moore <kmoore at digium.com>

Modified:
    linux/trunk/drivers/dahdi/voicebus/voicebus.c

Modified: linux/trunk/drivers/dahdi/voicebus/voicebus.c
URL: http://svnview.digium.com/svn/dahdi/linux/trunk/drivers/dahdi/voicebus/voicebus.c?view=diff&rev=9542&r1=9541&r2=9542
==============================================================================
--- linux/trunk/drivers/dahdi/voicebus/voicebus.c (original)
+++ linux/trunk/drivers/dahdi/voicebus/voicebus.c Wed Dec 15 12:54:49 2010
@@ -628,7 +628,7 @@
 	unsigned long timeout;
 	u32 reg;
 	u32 pci_access;
-	const u32 DEFAULT_PCI_ACCESS = 0xfffc0002;
+	const u32 DEFAULT_PCI_ACCESS = 0xffdc0002;
 	u8 cacheline_size;
 	BUG_ON(in_interrupt());