Hi, On Sun, Apr 02, 2023, James Ettle wrote: > Hello, > > I have a 20Gbps USB-C port on a plug-in card that uses an Asmedia ASM3242 > controller. When I attach devices capable of 10Gbps or 20Gbps, lsusb -t > reports they are connected at 5Gbps. My test devices are: > > * 10Gbps USB hub > * RTL9210B based NVME enclosure, 10Gbps > * ASM236X based NVME enclosure, 20Gbps > > Now when I do transfer tests on the NVME enclosures I get speeds too high > for 5Gbps. In fact everything is consistent with them connecting at their > best possible SSP speeds. So it looks like just the speed reporting is > incorrect. > > It seems this problem has been encountered before in the following thread, a > bit over a year ago: > > https://urldefense.com/v3/__https://lore.kernel.org/all/CAKRa1U6rukBBwWx0vN2wqiHMbUH9zWsc-y1wknOCvhueqWsT7w@xxxxxxxxxxxxxx/__;!!A4F2R9G_pg!beAeIUnohpkAEs92iPBhg9xFF3wy_neCM8AbKOkCuo4Qo8w6XvED1IcSti7z5AQpMBmNXojdywa7NUorNyrk$ > > in which Thinh Nguyen posted the following patch: > > https://urldefense.com/v3/__https://lore.kernel.org/all/6908aa69-469b-8f92-8e19-60685f524f9c@xxxxxxxxxxxx/__;!!A4F2R9G_pg!beAeIUnohpkAEs92iPBhg9xFF3wy_neCM8AbKOkCuo4Qo8w6XvED1IcSti7z5AQpMBmNXojdywa7NT-Vk7Cj$ > > I've applied this to 6.2.9 and now the speed are correctly reported in > lsusb. Can I politely agitate for getting this patch revived and pushed > upstream? > It was just a testing patch to verify if the workaround works. It's not kernel ready. A proper patch requires a new xhci quirk matching targeted Asmedia host. If someone wants to take this diff suggestion and respin it for a proper patch (with proper testing), I can help review it. Thanks, Thinh
