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

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Date:	Tue, 2 Apr 2013 12:42:54 +0530
From:	Venu Byravarasu <vbyravarasu@...dia.com>
To:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	Stephen Warren <swarren@...dotorg.org>
CC:	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: host: tegra: Reset Tegra USB controller before init

> -----Original Message-----
> From: gregkh@...uxfoundation.org [mailto:gregkh@...uxfoundation.org]
> Sent: Tuesday, March 05, 2013 6:04 AM
> To: Stephen Warren
> Cc: Venu Byravarasu; stern@...land.harvard.edu; linux-
> usb@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] usb: host: tegra: Reset Tegra USB controller before init
> 
> On Mon, Mar 04, 2013 at 09:55:44AM -0700, Stephen Warren wrote:
> > On 03/04/2013 12:55 AM, Venu Byravarasu wrote:
> > > Stephen Warren wrote at Thursday, February 28, 2013 11:47 PM:
> > >> On 02/27/2013 11:36 PM, Venu Byravarasu wrote:
> > >>> To clear any configurations made by U-Boot on Tegra USB controller,
> > >>> reset it before init in probe.
> > >>
> > >>> diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-
> tegra.c
> > >>
> > >>> @@ -691,6 +692,10 @@ static int tegra_ehci_probe(struct
> platform_device
> > >> *pdev)
> > >>>  	if (err)
> > >>>  		goto fail_clk;
> > >>>
> > >>> +	tegra_periph_reset_assert(tegra->clk);
> > >>> +	udelay(1);
> > >>> +	tegra_periph_reset_deassert(tegra->clk);
> > >>

> > Alan, Greg, if you're OK with this patch now, or for any revised
> > version, an Ack so I can take it through the Tegra tree would be great,
> > thanks.
> 
> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
 
Hi Greg,

Stephen initially thought that the patch can be taken through tegra tree, along with
other patches posted at  http://marc.info/?l=linux-tegra&m=136361016003625&w=2 .
As some other issues are blocking that patch series, can this change be merged
independent of that patch series via USB tree?

The original change can be seen at http://marc.info/?l=linux-usb&m=136203353205291&w=2  

Thanks,
Venu

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