Hi Mathias,
Would you review this patch?
This patch could be applied into the latest usb.git / usb-next branch.
Best regards,
Yoshihiro Shimoda
> -----Original Message-----
> From: Yoshihiro Shimoda
> Sent: Tuesday, February 16, 2016 12:26 PM
> To: mathias.nyman@xxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx
> Cc: linux-usb@xxxxxxxxxxxxxxx; linux-renesas-soc@xxxxxxxxxxxxxxx; Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> Subject: [PATCH] usb: host: xhci-plat: fix cannot work if R-Car Gen2/3 run on above 4GB phys
>
> On xHCI controllers of 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 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 R-Car Gen2/3 run on above
> 4GB physical memory environment.
>
> This patch adds clearing the AC64 bit of xhci->hcc_params in the
> xhci_plat_quirks() to fix the issue.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> ---
> drivers/usb/host/xhci-plat.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index d39d6bf..047fb6a 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->hcc_params &= ~BIT(0); /* clear HCC_64BIT_ADDR */
> }
>
> /* called during probe() after chip reset completes */
> --
> 1.9.1
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