> From: Matthijs Kooijman [mailto:matthijs@xxxxxxxx] > Sent: Friday, May 17, 2013 1:53 AM > > Platform devices added through OF usually do not have any dma_mask > pointer set. If the hardware advertises DMA support, the driver will > expect DMA buffers to be passed in, but the USB core will not do this > due to lack of a dma mask, breaking all connectiviy. > > To fix this, set a default dma_mask by pointing it at the > coherent_dma_mask and set their value to a 32 bit mask. This still > allows any platform code to set any more specific mask if needed, but > makes the driver work for most dma-enabled hardware. > > Signed-off-by: Matthijs Kooijman <matthijs@xxxxxxxx> > --- > drivers/staging/dwc2/platform.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > It would be great if this patch could be included in 3.10, since it is > needed to make the dwc2 driver work on the ralink rt3052 target. > > Before, the plan was to set up the dma mask in MIPS platform code, but > because of a similar change in ehci and the uglyness of the code for > that, the plan for that infrastructure was dropped. This patch makes the > setting of the dma_mask happen in the same way as the patch Stephen > Warren (set device dma_mask without reference to global data). Acked-by: Paul Zimmerman <paulz@xxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
