From: Duc Dang Date: Fri, 9 Oct 2015 10:30:13 +0000 (+0300) Subject: usb: xhci: configure 32-bit DMA if the controller does not support 64-bit DMA X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fda182d80a0bf362c3970d44ec188fa4f294729f;p=linux-beck.git usb: xhci: configure 32-bit DMA if the controller does not support 64-bit DMA This change avoids DMA error in the cases where dma_mask and coherent_dma_mask of a 32-bit controller get configured as DMA_BIT_MASK(64) when running on a 64-bit system. Signed-off-by: Duc Dang Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 49a41c7890c8..6e7dc6f93978 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4913,6 +4913,16 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) !dma_set_mask(dev, DMA_BIT_MASK(64))) { xhci_dbg(xhci, "Enabling 64-bit DMA addresses.\n"); dma_set_coherent_mask(dev, DMA_BIT_MASK(64)); + } else { + /* + * This is to avoid error in cases where a 32-bit USB + * controller is used on a 64-bit capable system. + */ + retval = dma_set_mask(dev, DMA_BIT_MASK(32)); + if (retval) + return retval; + xhci_dbg(xhci, "Enabling 32-bit DMA addresses.\n"); + dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); } xhci_dbg(xhci, "Calling HCD init\n");