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Subject[PATCH 2/2] firewire: ohci: fix Ricoh R5C832, video reception
In dual-buffer DMA mode, no video frames are ever received from R5C832
by libdc1394. Fallback to packet-per-buffer DMA works reliably.
http://thread.gmane.org/gmane.linux.kernel.firewire.devel/13393/focus=13476

Reported-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
drivers/firewire/ohci.c | 5 +++++
1 file changed, 5 insertions(+)

Index: linux-2.6.31-rc8/drivers/firewire/ohci.c
===================================================================
--- linux-2.6.31-rc8.orig/drivers/firewire/ohci.c
+++ linux-2.6.31-rc8/drivers/firewire/ohci.c
@@ -2431,6 +2431,11 @@ static int __devinit pci_probe(struct pc
dev->device == PCI_DEVICE_ID_AGERE_FW643)
ohci->use_dualbuffer = false;

+ /* dual-buffer mode is broken */
+ if (dev->vendor == PCI_VENDOR_ID_RICOH &&
+ dev->device == PCI_DEVICE_ID_RICOH_R5C832)
+ ohci->use_dualbuffer = false;
+
/* x86-32 currently doesn't use highmem for dma_alloc_coherent */
#if !defined(CONFIG_X86_32)
/* dual-buffer mode is broken with descriptor addresses above 2G */
--
Stefan Richter
-=====-==--= =--- ===--
http://arcgraph.de/sr/


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