linux-kernel - Re: [PATCH RESEND 2/2] dt-bindings: usb: add no-64-bit-support property

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Date:   Wed, 1 Nov 2023 10:38:00 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Naveen Kumar <mnkumar@...gle.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, royluo@...gle.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH RESEND 2/2] dt-bindings: usb: add no-64-bit-support
 property

On Wed, Nov 01, 2023 at 10:16:25AM +0000, Naveen Kumar wrote:
> From: Naveen Kumar M <mnkumar@...gle.com>
> 
> Add a new DT option to specify whether a host controller is able to
> support 64-bit DMA memory pointers

What host controllers are broken?

> Signed-off-by: Naveen Kumar M <mnkumar@...gle.com>
> ---
>  Documentation/devicetree/bindings/usb/usb-xhci.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> index 180a261c3e8f..20dc134004f3 100644
> --- a/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> @@ -25,6 +25,10 @@ properties:
>      description: Set if the controller has broken port disable mechanism
>      type: boolean
>  
> +  quirk-no-64-bit-support:
> +    description: Set if the xHC doesn't support 64-bit DMA memory pointers

To set this property, you need to know that the host controller is
broken, so why not just make the driver set the quirk once it sees that
the host controller is one of the broken ones?
Unless there are "sometimes broken" host controllers, a dedicated
property should not be needed, right?

> +    type: boolean
> +
>    imod-interval-ns:
>      description: Interrupt moderation interval
>      default: 5000
> -- 
> 2.42.0.820.g83a721a137-goog
> 

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