linux-kernel - Re: [PATCH v3 2/2] dt-bindings: usb: snps,dwc3: Add 'snps,parkmode-disable-hs-quirk' quirk

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Date:   Tue, 18 Apr 2023 15:52:56 -0500
From:   Rob Herring <robh@...nel.org>
To:     Stanley Chang <stanley_chang@...ltek.com>
Cc:     Felipe Balbi <balbi@...nel.org>, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Subject: Re: [PATCH v3 2/2] dt-bindings: usb: snps,dwc3: Add
 'snps,parkmode-disable-hs-quirk' quirk


On Thu, 13 Apr 2023 18:09:14 +0800, Stanley Chang wrote:
> Add a new 'snps,parkmode-disable-hs-quirk' DT quirk to dwc3 core for
> disable the high-speed parkmode.
> 
> For some USB wifi devices, if enable this feature it will reduce the
> performance. Therefore, add an option for disabling HS park mode by
> device-tree.
> 
> In Synopsys's dwc3 data book:
> In a few high speed devices when an IN request is sent within 900ns of the
> ACK of the previous packet, these devices send a NAK. When connected to
> these devices, if required, the software can disable the park mode if you
> see performance drop in your system. When park mode is disabled,
> pipelining of multiple packet is disabled and instead one packet at a time
> is requested by the scheduler. This allows up to 12 NAKs in a micro-frame
> and improves performance of these slow devices.
> 
> Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
> ---
> v2 to v3 change:
> 1. Add the comment message.
> 2. cc the right maintainers.
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 

Acked-by: Rob Herring <robh@...nel.org>