Re: [PATCH v4 1/3] dt-bindings: usb: mtk-xhci: add a property for Gen1 isoc-in transfer issue

[Chunfeng Yun (云春峰)]

On Wed, 2023-12-27 at 12:19 +0300, Sergey Shtylyov wrote:
>  	 
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>  On 12/27/23 9:03 AM, 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 3k bytes;
> > The side-effect is that may cause performance drop about 10%,
> including
> 
>    That it may cause?
> 
> > bulk transfer.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
> > ---
> > v4: change rx-fifo size in bytes
> > v3: add fifo depth unit, change the value range from 0-3 to 1-4
> > v2: change 'mediatek,rxfifo-depth' to 'rx-fifo-depth'
> > ---
> >  .../devicetree/bindings/usb/mediatek,mtk-xhci.yaml    | 11
> +++++++++++
> >  1 file changed, 11 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-
> xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-
> xhci.yaml
> > index e9644e333d78..9f621f2209df 100644
> > --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> > +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> > @@ -124,6 +124,17 @@ 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
> 
>    Finishes.
> 
> > +      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,
> 
>    That it may cause? And including?
Ok, I'll fix these typos, 

Reply again, previous one contains HTML part;

Thanks
> 


> [...]
> 
> MBR, Sergey