linux-kernel - Re: RFC: btusb firmware load help

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Message-ID: <AANLkTi=o4Mc72NrNoALBdS3YHeY7RMyyAJPsCy=uW3+F@mail.gmail.com>
Date:	Wed, 6 Oct 2010 11:26:14 -0700
From:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Marcel Holtmann <holtmann@...ux.intel.com>,
	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	linux-bluetooth <linux-bluetooth@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	Deepak Dhamdhere <Deepak.Dhamdhere@...eros.com>,
	Sree Durbha <Sree.Durbha@...eros.com>
Subject: Re: RFC: btusb firmware load help

On Wed, Oct 6, 2010 at 11:22 AM, Luis R. Rodriguez
<lrodriguez@...eros.com> wrote:
> On Wed, Oct 6, 2010 at 10:54 AM, Johannes Berg
> <johannes@...solutions.net> wrote:
>> On Wed, 2010-10-06 at 10:39 -0700, Luis R. Rodriguez wrote:
>>
>>
>>> > With sflash based AR3011 hardware, when we connect the device to USB
>>> > port it gets detected as a Bluetooth device because of firmware in
>>> > Flash (VID=0x0CF3, PID=0x3002). This triggers the Bluetooth sub
>>> > system driver (btusb.ko) directly in the host instead of ath3k
>>> > DFU driver. Therefore, there is no firmware downloaded in to the
>>> > RAM to bring up Bluetooth at this point. This is the problem
>>> > we're trying to "fix".
>>
>> So the easiest fix for this would be to
>>  a) ignore 0x0cf3,0x3002 in btusb
>>  b) add it to ath3k firmware loading
>>  c) change the ath3k firmware to load with 0x0cf3,0x3003 (or whatever
>>    else you want, as long as it's not 0x3000 and not 0x3002)
>>
>> Then the ignore in btusb won't affect ath3k after that new firmware was
>> loaded.
>
> Good idea, I forgot about possible firmware changes :) Lets see if our
> team can do that. Thanks for all the feedback.

Deepak a proof of concept test can involve simply hex-editing the
ath3k-1.fw and replacing 0x3002 to 0x3003, then the above patch might
work.

  Luis
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