linux-kernel - Re: [PATCH] usb: host: tegra: Reset Tegra USB controller before init

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Message-ID: <512F9D90.7090705@wwwdotorg.org>
Date:	Thu, 28 Feb 2013 11:10:24 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Venu Byravarasu <vbyravarasu@...dia.com>,
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: host: tegra: Reset Tegra USB controller before init

On 02/28/2013 08:09 AM, Alan Stern wrote:
> On Thu, 28 Feb 2013, Venu Byravarasu wrote:
> 
>> To clear any configurations made by U-Boot on Tegra USB controller,
>> reset it before init in probe.
>>
>> Signed-off-by: Venu Byravarasu <vbyravarasu@...dia.com>
>> ---
>> When U-Boot configures a Tegra USB controller in device mode and if the EHCI
>> driver of kernel tries to set it to HOST mode, message "irq 52: nobody cared"
>> appears and IRQ gets disabled.
>>
>> This issue was initially reported with: http://marc.info/?l=linux-tegra&m=136110175423601&w=2
>>
>> To avoid such issues, due to configurations made by U-Boot driver, reset the
>> Tegra USB controller, before configuring it by kernel.
> 
> Does the Tegra platform use shared interrupts?  If it does, what 
> happens if the IRQ is enabled and in use by another device before 
> ehci-tegra resets the USB controller?

I believe there's a dedicated interrupt just for each individual controller.
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