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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2016-04-08 15:25:08 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-13 20:55:56 +0200
commit5ad3b03e4910f9f62342956ecdc758c7af6b8699 (patch)
tree231db0f9f12baab215a8820977089bcafbc4c187 /drivers/usb
parentusb: host: xhci: add a new quirk XHCI_NO_64BIT_SUPPORT (diff)
downloadlinux-5ad3b03e4910f9f62342956ecdc758c7af6b8699.tar.xz
linux-5ad3b03e4910f9f62342956ecdc758c7af6b8699.zip
usb: host: xhci-plat: fix cannot work if R-Car Gen2/3 run on above 4GB phys
This patch fixes an issue that cannot work if R-Car Gen2/3 run on above 4GB physical memory environment to use a quirk XHCI_NO_64BIT_SUPPORT. 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 '')
-rw-r--r--drivers/usb/host/xhci-plat.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 5c15e9bc5f7a..474b5fa14900 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -39,12 +39,25 @@ static const struct xhci_driver_overrides xhci_plat_overrides __initconst = {
static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
{
+ struct usb_hcd *hcd = xhci_to_hcd(xhci);
+
/*
* As of now platform drivers don't provide MSI support so we ensure
* here that the generic code does not try to make a pci_dev from our
* dev struct in order to setup MSI
*/
xhci->quirks |= XHCI_PLAT;
+
+ /*
+ * On R-Car Gen2 and Gen3, the AC64 bit (bit 0) of HCCPARAMS1 is set
+ * to 1. However, these SoCs don't support 64-bit address memory
+ * pointers. So, this driver clears the AC64 bit of xhci->hcc_params
+ * to call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in
+ * xhci_gen_setup().
+ */
+ if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
+ xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3))
+ xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
}
/* called during probe() after chip reset completes */