usb: host: xhci: add a new quirk XHCI_NO_64BIT_SUPPORT
authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Fri, 8 Apr 2016 13:25:07 +0000 (16:25 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 13 Apr 2016 18:55:56 +0000 (11:55 -0700)
commit0a380be8233dbf8dd20795b801c5d5d5ef3992f7
tree0edc63ecfcd9cf37d0661298e46e8c4a08e0ca78
parent671ffdff5b13314b1fc65d62cf7604b873fb5dc4
usb: host: xhci: add a new quirk XHCI_NO_64BIT_SUPPORT

On some xHCI controllers (e.g. R-Car SoCs), the AC64 bit (bit 0) of
HCCPARAMS1 is set to 1. However, the xHCs don't support 64-bit
address memory pointers actually. So, in this case, this driver should
call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in xhci_gen_setup().
Otherwise, the xHCI controller will be died after a usb device is
connected if it runs on above 4GB physical memory environment.

So, this patch adds a new quirk XHCI_NO_64BIT_SUPPORT to resolve
such an issue.

Cc: <stable@vger.kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/host/xhci.c
drivers/usb/host/xhci.h