linux-kernel - Re: [PATCHv7 2.6.34-rc5 4/5] mxc: Add generic USB HW initialization for MX51

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Message-ID: <20100422150244.GX30801@buzzloop.caiaq.de>
Date:	Thu, 22 Apr 2010 17:02:44 +0200
From:	Daniel Mack <daniel@...aq.de>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Dinh.Nguyen@...escale.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	valentin.longchamp@...l.ch, grant.likely@...retlab.ca,
	bryan.wu@...onical.com, amit.kucheria@...onical.com,
	Jun.Li@...escale.com, xiao-lizhang@...escale.com
Subject: Re: [PATCHv7 2.6.34-rc5 4/5] mxc: Add generic USB HW
 initialization for MX51

On Thu, Apr 22, 2010 at 04:45:43PM +0200, Sascha Hauer wrote:
> On Wed, Apr 21, 2010 at 10:13:14AM -0500, Dinh.Nguyen@...escale.com wrote:
> > @@ -191,6 +191,11 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
> >  		clk_enable(priv->ahbclk);
> >  	}
> >  
> > +	/* setup specific usb hw */
> > +	ret = mxc_initialize_usb_hw(pdev->id, pdata->flags);
> > +	if (ret < 0)
> > +		goto err_init;
> > +
> >  	/* set USBMODE to host mode */
> >  	temp = readl(hcd->regs + USBMODE_OFFSET);
> >  	writel(temp | USBMODE_CM_HOST, hcd->regs + USBMODE_OFFSET);
> > @@ -199,11 +204,6 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
> >  	writel(pdata->portsc, hcd->regs + PORTSC_OFFSET);
> >  	mdelay(10);
> >  
> > -	/* setup USBCONTROL. */
> > -	ret = mxc_set_usbcontrol(pdev->id, pdata->flags);
> > -	if (ret < 0)
> > -		goto err_init;
> 
> Has somebody tested if this works on other i.MXs? I remember it was quite
> difficult to get the correct order of initialization. I don't want to
> break this.

Yes, I tested it on a MX31LiteKit and it works fine, so I didn't
consider this critical.

> We should at least make a seperate patch from it so that anybody
> bisecting this only finds this change and not the i.MX51 support also
> added in this patch.

Good idea. However, I insisted to have this hunk in this one commit as
it follows a function rename (mxc_initialize_usb_hw vs.
mxc_set_usbcontrol). So if we want to have this seperate, we'd need one
intermediate step.

Daniel
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