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?
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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