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>

2 files changed, 11 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) &&
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index e293e0974f48..70f215c20b2b 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1641,6 +1641,7 @@ struct xhci_hcd {
 #define XHCI_PME_STUCK_QUIRK    (1 << 20)
 #define XHCI_MTK_HOST           (1 << 21)
 #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 */