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 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
