linux-kernel - Re: [PATCH RESEND] xhci: also avoid the XHCI_ZERO_64B

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Message-ID: <86bkktxdpy.wl-maz@kernel.org>
Date:   Thu, 16 Mar 2023 09:11:37 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     D Scott Phillips <scott@...amperecomputing.com>
Cc:     linux-usb@...r.kernel.org, Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] xhci: also avoid the XHCI_ZERO_64B_REGS quirk with a passthrough iommu

On Wed, 15 Mar 2023 18:14:40 +0000,
D Scott Phillips <scott@...amperecomputing.com> wrote:
> 
> Previously the quirk was skipped when no iommu was present. The same
> rationale for skipping the quirk also applies in the iommu.passthrough=1
> case.
> 
> Skip applying the XHCI_ZERO_64B_REGS quirk if the device's iommu domain is
> passthrough.
> 
> Fixes: 12de0a35c996 ("xhci: Add quirk to zero 64bit registers on Renesas PCIe controllers")
> Signed-off-by: D Scott Phillips <scott@...amperecomputing.com>

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

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