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

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Message-ID: <150d776b6a4ab0f0ee1926dd916d6eea3a583ad5.camel@mediatek.com>
Date: Fri, 15 Dec 2023 06:10:27 +0000
From: Chunfeng Yun (云春峰) <Chunfeng.Yun@...iatek.com>
To: "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>
CC: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"mathias.nyman@...el.com" <mathias.nyman@...el.com>,
	Eddie Hung (洪正鑫) <Eddie.Hung@...iatek.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	Macpaul Lin (林智斌) <Macpaul.Lin@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1
 isoc-in transfer issue

On Wed, 2023-12-13 at 09:05 +0100, Krzysztof Kozlowski wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  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.
I fix it as 2, it's OK to use a uint32, I'll modify it.

Thanks

> 
> 
> Best regards,
> Krzysztof
> 
>