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Thu, 14 Dec 2023 23:36:47 -0800 (PST) Received: from [192.168.1.20] ([178.197.218.27]) by smtp.gmail.com with ESMTPSA id et14-20020a056402378e00b005527cfaa2dfsm1217270edb.49.2023.12.14.23.36.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Dec 2023 23:36:46 -0800 (PST) Message-ID: Date: Fri, 15 Dec 2023 08:36:45 +0100 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue Content-Language: en-US To: Chunfeng Yun , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , AngeloGioacchino Del Regno Cc: Conor Dooley , Matthias Brugger , Mathias Nyman , linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Macpaul Lin , Eddie Hung References: <20231215073431.8512-1-chunfeng.yun@mediatek.com> From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 15/12/2023 08:34, 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 "rx-fifo-depth" to work around this hardware issue, > prefer to use 2; > The side-effect is that may cause performance drop about 10%, including > bulk transfer. > > Signed-off-by: Chunfeng Yun > --- > v2: change 'mediatek,rxfifo-depth' to 'rx-fifo-depth' > --- > .../devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml > index e9644e333d78..e44a71acb5c0 100644 > --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml > +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml > @@ -124,6 +124,18 @@ properties: > defined in the xHCI spec on MTK's controller. > default: 5000 > > + rx-fifo-depth: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + It is a quirk used to work around Gen1 isoc-in endpoint transfer issue > + that still send out unexpected ACK after device finish the burst transfer > + with a short packet and cause an exception, specially on a 4K camera > + device, it happens on controller before about IPM v1.6.0; the side-effect > + is that may cause performance drop about 10%, include bulk transfer, > + prefer to use 2 here. What is the meaning of 0-3? bytes? words? > + minimum: 0 > + maximum: 3 Best regards, Krzysztof