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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@digium.com>
Signed-off-by: Russ Meyerriecks <rmeyerriecks@digium.com>
Acked-by: Kinsey Moore <kmoore@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9542 a0bf4364-ded3-4de4-8d8a-66a801d63aff
This commit is contained in:
Shaun Ruffell 2010-12-15 18:54:49 +00:00
parent 1d9cbea469
commit 4de462c3e0
1 changed files with 1 additions and 1 deletions
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2
drivers/dahdi/voicebus/voicebus.c
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@ -628,7 +628,7 @@ vb_reset_interface(struct voicebus *vb)
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());