firewire: ohci: fix Ricoh R5C832, video reception (4fe0badd) · Commits · 戴 / test

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:

drivers/firewire/ohci.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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 */