On Thu, 2023-12-28 at 12:44 +0200, Mathias Nyman wrote: > > External email : Please do not click links or open attachments until > you have verified the sender or the content. > Hi > > On 27.12.2023 8.03, 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 > > bulk transfer. > > Is it be possible to detect those Mediatek xHC versions that need > this > workaround in the xhci-mtk driver directly? the version info is saved in IPPC register, when support dual-role mode, xhci-mtk driver can't access these register which are controlled by dual-role controller mtu3 driver; another reason is that some cases, e.g. connected a on-board fixed mass storage device, do not use 4K camera, it's better to use the default rx-fifo-depth; Thanks > > This way we could avoid passing a new "rx-fifo-depth" property to it. > > Thanks > Mathias > >
