Re: Carl9170 Firmware

[Christian Lamparter <chunkeey@googlemail.com>]

On Tuesday, September 13, 2011 11:18:23 PM J Igrap wrote:
> While using the past days the carl9170 firmware with a USB card under a
> linux guest running different kernel and driver versions I kept running into
> the issue of a usb disconnect when the card was put under load:
linux guest? You are not using carl9170 in a VM, are you?

>  usb 1-1: no command feedback received (-110).
>  carl9170 cmd: 08 01 00 00 f0 36 1c 00 00 24 00 00              .....6...$..
>  usb 1-1: restart device (6)
> 
> No matter what kernel driver/firmware I tried I will still get it. I decided
> to look into it a bit more and I narrowed it down to be a firmware issue
> with the following code snippet:
Or it could be a problem with the USB PHY. However, the driver
seems to be able to handle the situation and restarts the device
accordingly.
 
> void handle_cmd(struct carl9170_rsp *resp) in src/cmd.c
> 
>         case CARL9170_CMD_WREG:
> esp->hdr.len = 0;
>                 for (i = 0; i < (cmd->hdr.len / 8); i++)
>                         set(cmd->wreg.regs[i].addr, cmd->wreg.regs[i].val);
>                 break;
> 
> That code appears to handle event 1 which is a write into a register. In
> some cases that write appeared to cause a failure and a reset into the card.
> I added a simple delay loop before the switch statement and that seemed to
> fix the issue and I don't lose the card anymore even under a lot of load.
> Obviously that's not a real fix and something else more reliable needs to be
> in place.
Any idea what this "something" else might be?

Regards,
	Chr