diff options
| author | Duc Dang <dhdang@apm.com> | 2015-10-09 13:30:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-16 23:34:22 -0700 |
| commit | fda182d80a0bf362c3970d44ec188fa4f294729f (patch) | |
| tree | 6169684562fb5eff4630a23ed0e17d925f8e28a7 /drivers/usb | |
| parent | 579085b51c458fd4a5df9d5e19238f5e09bb114b (diff) | |
| download | linux-fda182d80a0bf362c3970d44ec188fa4f294729f.tar.gz | |
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 <dhdang@apm.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/xhci.c | 10 |
1 files changed, 10 insertions, 0 deletions
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"); |