linux-kernel - Re: [PATCH 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue

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Date:   Wed, 13 Dec 2023 12:17:17 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Macpaul Lin <macpaul.lin@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: Re: [PATCH 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1
 isoc-in transfer issue

Il 13/12/23 09:05, Krzysztof Kozlowski ha scritto:
> On 13/12/2023 07:35, Chunfeng Yun wrote:
>> For Gen1 isoc-in endpoint on controller before about SSUSB IPM v1.6.0, it
>> still send out unexpected ACK after receiving a short packet in burst
>> transfer, this will cause an exception on connected device, specially for
>> a 4k camera.
>> Add a quirk property "mediatek,rxfifo-depth" to work around this hardware
>> issue;
>> The side-effect is that may cause performance drop about 10%, including
>> bulk transfer.
>>
>> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
>> ---
>>   .../devicetree/bindings/usb/mediatek,mtk-xhci.yaml     | 10 ++++++++++
>>   1 file changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
>> index e9644e333d78..b8ed68574ba4 100644
>> --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
>> +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
>> @@ -124,6 +124,16 @@ properties:
>>         defined in the xHCI spec on MTK's controller.
>>       default: 5000
>>   
>> +  mediatek,rxfifo-depth:
>> +    description:
> 
> The property description and driver patch suggest you configure the
> depth of FIFO, so this should be not bool, but some uint32. And then,
> use generic "fifo-depth" property to set desired depth.

Did you mean "rx-fifo-depth" instead, as used in net?
This FIFO depth parameter is for RX only.

Cheers,
Angelo