diff options
| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2016-04-08 16:25:07 +0300 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-04-20 09:41:04 -0400 |
| commit | f1aa53dc77f70a97a879b97990fb07b1c6e8ef57 (patch) | |
| tree | 9ea2a552ac5dcaa67292951185f962bc8729d1f7 /drivers/usb | |
| parent | 73554d82eea481660e73673fd6284297c955fa49 (diff) | |
usb: host: xhci: add a new quirk XHCI_NO_64BIT_SUPPORT
[ Upstream commit 0a380be8233dbf8dd20795b801c5d5d5ef3992f7 ]
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>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/xhci.c | 10 | ||||
| -rw-r--r-- | drivers/usb/host/xhci.h | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 224d0f5cbeeb..af2ccdfdcc33 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4914,6 +4914,16 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) goto error; 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) && diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 810f7f6d356c..6fbb13fa7718 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1566,6 +1566,7 @@ struct xhci_hcd { #define XHCI_BROKEN_STREAMS (1 << 19) #define XHCI_PME_STUCK_QUIRK (1 << 20) #define XHCI_SSIC_PORT_UNUSED (1 << 22) +#define XHCI_NO_64BIT_SUPPORT (1 << 23) unsigned int num_active_eps; unsigned int limit_active_eps; /* There are two roothubs to keep track of bus suspend info for */ |