[PATCH] b43: ensure ext PA lines are enabled for BCM4331

[Hauke Mehrtens <hauke@hauke-m.de>]

On 05/31/2012 04:26 PM, Seth Forshee wrote:
> On Thu, May 31, 2012 at 04:16:05PM +0200, Hauke Mehrtens wrote:
>> Hi Seth,
>>
>> why don't you call this from bcma_pmu_workarounds() in
>> drivers/bcma/driver_chipcommon_pmu.c instead of calling this from b43? I
>> think it looks better to call some workarounds on chip common from bcma
>> and not from b43.
> 
> Arend recommended calling it from within b43's start op, but I'm not
> sure of the reason. Arend?
> 
> Agreed though that if there's no need to run it every time the interface
> is started then bcma_pmu_workarounds() would be a nicer place for it.

brcmsmac calls the chip specific the workarounds in ai_doattach(), but
the ones for BCM4313 and BCM43224 are also in bcma_pmu_workarounds(),
this should be cleaned up to have them just at one place. In some old
version of brcmsmac the workaround for the BCM4331 was also called from
ai_doattach() function, but later removed likely because this devices is
not supported by brcmsmac.
So if there is not better reason as, the proprietary Broadcom driver
does so, I would like to see this call in bcma_pmu_workarounds().

>> According to some Broadcom code this should also be called for chip_id
>> 43431 when turning it on and in the sprom code.
> 
> I'm having trouble parsing this, specifically the "and in the sprom
> code" part. Can you clarify?

In the Broadcom SDK code si_chipcontrl_epa4331(), the same function as
bcma_chipco_bcm4331_ext_pa_lines_ctl() in bcma, gets called for devices
with a chip id of 0x4331 and 43431, both seam to be BCM4331 devices. We
should also call our workarounds for both chip ids.

Hauke