Quoting Florian Fainelli <flor...@openwrt.org>:
>
> Hello,
>
> I am running Debian testing kernel 3.1.0-1-amd64, using a 079b:0062 Sagem
> XG-76NA 802.11bg stick.
>
> Upon zd1211rw interface
> bringup (ifconfig wlan0 up) I get the following timeout:
>
> [ 950.330573] zd1211rw 1-3:1.0: phy2
> [ 955.108510] zd1211rw 1-3:1.0: firmware version 4725
> [ 955.148532] zd1211rw 1-3:1.0: zd1211b chip 079b:0062 v4810 high 00-19-70
> AL2230_RF pa0 g--NS
> [snip]
> [ 955.204072] zd1211rw 1-3:1.0: error ioread32(CR_REG1): -110
>
> A second ifconfig wlan0 up brings the interface up without problems.
>
> After a bit more debugging, the call trace is the following:
>
> [10241.028130] zd1211rw 1-3:1.0: zd_chip_lock_phy_regs: error
> ioread32(CR_REG1): -110
> [10241.028140] zd1211rw 1-3:1.0: zd_switch_radio_on: failed to lock PHY regs
> [10241.028148] zd1211rw 1-3:1.0: zd_op_start: failed to set radio on
>
> The following small modification works around the issue:
>
> diff --git a/zd_mac.c b/zd_mac.c
> index cabfae1..6bfb673 100644
> --- a/zd_mac.c
> +++ b/zd_mac.c
> @@ -306,9 +306,14 @@ int zd_op_start(struct ieee80211_hw *hw)
> r = set_mc_hash(mac);
> if (r)
> goto disable_int;
> +
> + msleep(10);
> +
> r = zd_chip_switch_radio_on(chip);
> - if (r < 0)
> + if (r < 0) {
> + dev_err(zd_chip_dev(chip), "%s: failed to set radio on\n",
> __func__);
> goto disable_int;
> + }
> r = zd_chip_enable_rxtx(chip);
> if (r < 0)
> goto disable_radio;
>
> Is it possible that some chips require more time between a set_mc_hash and a
> radio on? Or in general that consequent writes to the PHY regs
> should be timed
> appropriately?
Yes, it is possible. Vendor driver appears to have quite alot sleeps
spread around in RF-chip handling code. I might have seen this myself
sometimes when zd1211 device has firmware freeze and has to be
reseted. But since freeze is hard to reproduce and reset didn't fail
always, I didn't bother with it.
Can you give your "Signed-off-by" line for the patch?
-Jussi
>
> When I googled for this timeout issue, I could see quite some
> reports of other
> people having this error while the chip was already operating.
>
> Thanks
> --
> Florian
> --
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>
>
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