Hi,
> Hi,
>
> Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> writes:
> > [ text/plain ]
> > 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_CLEAR_AC64 to resolve such an issue.
> >
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > ---
> > drivers/usb/host/xhci.c | 10 ++++++++++
> > drivers/usb/host/xhci.h | 1 +
> > 2 files changed, 11 insertions(+)
> >
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index d51ee0c..4b5e979 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_CLEAR_AC64)
> > + 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 e293e09..1963148 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_CLEAR_AC64 (1 << 23)
>
> hmm, the quirk isn't really CLEAR_AC64, that's the workaround. How about
> calling this XHCI_NO_64BIT_SUPPORT ? or something along those lines.
Thank you for the suggestion. I agree with you.
So, I will change the name to XHCI_NO_64BIT_SUPPORT.
Best regards,
Yoshihiro Shimoda
> --
> balbi
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