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

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Message-ID: <4CADF6BF.6070305@atheros.com>
Date:	Thu, 7 Oct 2010 22:05:11 +0530
From:	Bala Shanmugam <sbalashanmugam@...eros.com>
To:	Marcel Holtmann <holtmann@...ux.intel.com>
CC:	Shanmugamkamatchi Balashanmugam 
	<Shanmugamkamatchi.Balashanmugam@...eros.com>,
	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	Johannes Berg <johannes@...solutions.net>,
	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 10/7/2010 8:54 PM, Marcel Holtmann wrote:
> Hi Bala,
>
>> Thanks Johannes.  This would be better option to change PID in firmware
>> as blacklisting 3002 might create problems for 3011 chipsets.
>> Will try and let you people know.
> The misbehaving 3002 needs to be blacklisted in btusb.c anyway. However
> after loading the firmware to 3002 device, it should change its PID to
> something else.
>
> I am still trying to figure out if this is one stage firmware loading or
> a two stage firmware loading. This is all pretty unclear and nobody has
> answered this clearly so far.
>
> Regards
>
> Marcel
>
>
Marcel,

eeprom based 3011 chips comes up with PID 3000 giving control to DFU 
driver [ath3k].  ath3k downloads the
firmware changing PID to 3002.  Now btusb gets control.

In sflash based devices to reduce windows suspend/resume time we had a 
small firmware in flash which
enables the device to get detected as Generic Bluetooth USB device with 
PID 3002.  So control reaches btusb when device is plugged in, leaving 
no option for us to load the actual firmware.

Solution would be to blacklist 3002 in btusb, enable ath3k to get 
control for both the devices, download the firmware and change PID to 
3003 so that control with come to btusb.

Thanks for your time.

Regards,
Bala.
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