diff options
| author | Yoshihiro Shimoda | 2016-04-08 16:25:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2016-04-13 11:55:56 -0700 |
| commit | 0a380be8233dbf8dd20795b801c5d5d5ef3992f7 (patch) | |
| tree | 0edc63ecfcd9cf37d0661298e46e8c4a08e0ca78 /drivers/usb/host/xhci.c | |
| parent | 671ffdff5b13314b1fc65d62cf7604b873fb5dc4 (diff) | |
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>
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -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 b60928802686..9283d3331b59 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4948,6 +4948,16 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) return retval; xhci_dbg(xhci, "Reset complete\n"); + /* + * 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, this driver clears the AC64 + * bit of xhci->hcc_params to call dma_set_coherent_mask(dev, + * DMA_BIT_MASK(32)) in this xhci_gen_setup(). + */ + if (xhci->quirks & XHCI_NO_64BIT_SUPPORT) + xhci->hcc_params &= ~BIT(0); + /* Set dma_mask and coherent_dma_mask to 64-bits, * if xHC supports 64-bit addressing */ if (HCC_64BIT_ADDR(xhci->hcc_params) && |