[ath9k-devel] trouble with DWA-552 and ath9k

[Pavel Roskin <proski@gnu.org>]

On Wed, 2010-01-13 at 13:34 +0530, Sujith wrote:
> Brian Walker wrote:
> > Ok! Now I have some debugging information. Here are the ath9k lines from
> > dmesg right after boot:

That's for Ubiquiti SR71A:

# modprobe ath9k

ath9k 0000:04:01.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
ath: UNDEFINED -> AWAKE
ath: serialize_regmode is 1
ath: Eeprom VER: 14, REV: 22
ath: EEPROM regdomain: 0x0
ath: EEPROM indicates default country code should be used
ath: doing EEPROM country->regdmn map search
ath: country maps to regdmn code: 0x3a
ath: Country alpha2 being used: US
ath: Regpair used: 0x3a
ath: tx DMA: 512 buffers 1 desc/buf
ath: tx DMA map: ffff88003bfa0000 (80712) -> 3bfa0000 (80712)
ath: beacon DMA: 4 buffers 1 desc/buf
ath: beacon DMA map: ffff88003bf74000 (608) -> 3bf74000 (608)
ath: cachelsz 32 rxbufsize 3872
ath: rx DMA: 512 buffers 1 desc/buf
ath: rx DMA map: ffff88003bf40000 (80712) -> 3bf40000 (80712)
phy4: Selected rate control algorithm 'ath9k_rate_control'
Registered led device: ath9k-phy4::radio
Registered led device: ath9k-phy4::assoc
Registered led device: ath9k-phy4::tx
Registered led device: ath9k-phy4::rx
phy4: Atheros AR9280 Rev:2 mem=0xffffc90008320000, irq=19
udev: renamed network interface wlan0 to wlan4

# ifconfig wlan4 up

ath: Starting driver with initial channel: 2412 MHz
ath: ah->misc_mode 0x4
ath: timeout (100000 us) on reg 0x9860: 0xdeadbeef & 0x00000001 != 0x00000000
ath: Unable to reset hardware; reset status -5 (freq 2412 MHz)

> The first HW reset fails as the contents of RTC_RC is weird.
> Which probably means that the earlier initialization messed up somewhere,
> corrupting the RTC register space - this would be my immediate guess.
> 
> Will take a look. Thanks for the debug log.

I was able to make Ubiquiti SR71A work (at least it can scan now) by
treating it as an older Merlin 1.0 rather that Merlin 2.1 (version 0x80,
revision 2) as it claims to be:

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 2311fe7..20f5375 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -690,7 +690,7 @@ static void ath9k_hw_init_mode_regs(struct ath_hw *ah)
 			ar9285PciePhy_clkreq_always_on_L1_9285,
 			ARRAY_SIZE(ar9285PciePhy_clkreq_always_on_L1_9285), 2);
 		}
-	} else if (AR_SREV_9280_20_OR_LATER(ah)) {
+	} else if (0) {
 		INIT_INI_ARRAY(&ah->iniModes, ar9280Modes_9280_2,
 			       ARRAY_SIZE(ar9280Modes_9280_2), 6);
 		INIT_INI_ARRAY(&ah->iniCommon, ar9280Common_9280_2,

-- 
Regards,
Pavel Roskin