[ath9k-devel] D-Link DWA-547 completely freezes system

[Jorge Boncompte [DTI2] <jorge@dti2.net>]

El 22/01/2010 18:52, Pavel Roskin escribi?:
> On Fri, 2010-01-22 at 10:58 +0100, Khashayar Naderehvandi wrote:
> 
>>> I can confirm that 0xdeadbeef comes from the chip, not from some random
>>> place in memory.  Even the supported Ubiquiti SR71-15 returns 0xdeadbeef
>>> when reading from the register 0x00ac (AR_IMR_S2).
>>>
>>> The fact that SR71-12 only works if installed in a slot below SR71-15 is
>>> very intriguing.  I checked the modules with nm for possible static
>>> variables, but I cannot spot anything wrong.  I'm going to try
>>> mmiotrace.
>>>
>> Pavel, this is way too technical for me to understand :)
> 
> Sorry, it was meant for Luis.
> 
> Ubiquiti SR71-15 is the only AR9220 card I know that works with ath9k.
> It's a 5GHz-only card, so maybe that's the reason.
> 
> Ubiquiti SR71-12 is a 2GHz card and it doesn't work.  However, if
> SR71-15 is present in the same system and has a lower PCI address so
> that it's initialized first, SR71-12 would work.  This makes me think
> that the initialization of SR71-15 changes something in the state of the
> driver.  The state should be separate for every device, so it may be a
> bug.
> 
> I discovered that reading from some registers gives 0xdeadbeef.  Even
> for SR71-15 reading from one register gives 0xdeadbeef.  0xdeadbeef is a
> number commonly used to indicate uninitialized data.  But it comes from
> the device.  So we are doing something wrong.  Maybe the register in
> question (AR_IMR_S2) should be initialized, or maybe the whole chip
> initialization is wrong.

	Hi Pavel, i had done some tests and did found that my SR71-12 does works if I
change in hw.c::ath9k_hw_init_11a_eeprom_fix()...

if ((ah->hw_version.devid == AR9280_DEVID_PCI) &&
	test_bit(ATH9K_MODE_11A, ah->caps.wireless_modes)) {

to...

if (ah->hw_version.devid == AR9280_DEVID_PCI) {

	Unfortunately, I don't know what that 'fix' fixes :-)

-- 
==============================================================
Jorge Boncompte - Ingenieria y Gestion de RED
DTI2 - Desarrollo de la Tecnologia de las Comunicaciones
--------------------------------------------------------------
C/ Abogado Enriquez Barrios, 5   14004 CORDOBA (SPAIN)
Tlf: +34 957 761395 / FAX: +34 957 450380
==============================================================
- Sin pistachos no hay Rock & Roll...
- Without wicker a basket cannot be made.
==============================================================