Hi,
Thanks, I discovered that if I connect the device to xhci0 it exhibits poor
performance (and only shows 1000 IRQ/sec), however if I connect it to xhci1 it
works fine (8kHz).
They show up slightly differently in dmesg:
xhci0: <XHCI (generic) USB 3.0 controller> mem 0xfcfa0000-0xfcfa7fff at device
0.0 on pci1
xhci0: 32 bytes context size, 64-bit DMA
usbus0 on xhci0
usbus0: 5.0Gbps Super Speed USB v3.0
xhci1: <XHCI (generic) USB 3.0 controller> mem 0xfcb00000-0xfcbfffff at device
0.3 on pci7
xhci1: 64 bytes context size, 64-bit DMA
usbus1 on xhci1
usbus1: 5.0Gbps Super Speed USB v3.0
However I don't know what the "context size" means, they are different PCI IDs
too:
xhci0@pci0:1:0:0: class=0x0c0330 rev=0x00 hdr=0x00 vendor=0x1022
device=0x43ec subvendor=0x1b21 subdevice=0x1142
vendor = 'Advanced Micro Devices, Inc. [AMD]'
class = serial bus
subclass = USB
bar [10] = type Memory, range 64, base 0xfcfa0000, size 32768, enabled
PCI-e errors = Correctable Error Detected
Unsupported Request Detected
Corrected = Advisory Non-Fatal Error
xhci1@pci0:7:0:3: class=0x0c0330 rev=0x00 hdr=0x00 vendor=0x1022
device=0x15e0 subvendor=0x1043 subdevice=0x876b
vendor = 'Advanced Micro Devices, Inc. [AMD]'
device = 'Raven USB 3.1'
class = serial bus
subclass = USB
bar [10] = type Memory, range 64, base 0xfcb00000, size 1048576, enabled
I tried changing the imod value from 500 to 125 but it had no impact on the IRQ
rate so I guess perhaps that controller is broken in some way..
> On 4 Dec 2021, at 16:32, Hans Petter Selasky <[email protected]> wrote:
>
> On 12/4/21 03:12, Daniel O'Connor via freebsd-usb wrote:
>> How can I change it?
>
> Please refer to this:
>
> /* set up interrupt rate */
> XWRITE4(sc, runt, XHCI_IMOD(0), sc->sc_imod_default);
>
> --HPS
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
