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

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Message-ID: <4CDAE550.8090202@atheros.com>
Date:	Thu, 11 Nov 2010 00:02:48 +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

  Hi Marcel,
On 10/7/2010 10:05 PM, Bala Shanmugam wrote:
>    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.

As you suggested we blacklisted PID 3002 in btusb and loaded firmware 
using ath3k and it worked.
Thanks.
Many of our customers are using their own PIDs and blacklisting 3002 
won't work for them.
Can we blacklist all the PIDs used by different customers?

We have another device similar to above one, it doesn't do a USB reset 
after downloading firmware.
This is basically to reduce bring-up and suspend/resume time.
Can we add an infrastructure in btusb to download configuration or 
firmware for these devices?
If not can you please suggest a solution for this device.

Thanks in advance.

Regards,
Bala.
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