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>

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 3486bc4..76b321b 100644 (file)
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2431,6 +2431,11 @@ static int __devinit pci_probe(struct pci_dev *dev,
            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 */