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 <[email protected]> Signed-off-by: Stefan Richter <[email protected]>
yshchan · Sep 5, 2009 · 4fe0bad · 4fe0bad
1 parent fc38379
commit 4fe0bad
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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 */