Hello,
On 04/04/2023 01:07, Thinh Nguyen wrote:
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.
Understood. Unfortunately it's beyond my ability to make such a patch
myself. So this doesn't get lost, should I open a bug in Kernel
Bugzilla, or is it tracked elsewhere?
Thanks,
-James
