On Wed, Dec 13, 2023 at 12:17:17PM +0100, AngeloGioacchino Del Regno wrote: > 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@xxxxxxxxxxxx> > > > --- > > > .../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. Or rx-fifo-size. There's so many to choose from. Rob
