linux-kernel - Re: [PATCH v2 1/8] ohci-nxp: Driver cleanup

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Date:	Wed, 18 Apr 2012 10:23:53 +0200
From:	Roland Stigge <stigge@...com.de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	arm@...nel.org, linux-arm-kernel@...ts.infradead.org,
	thierry.reding@...onic-design.de, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, dmitry.torokhov@...il.com,
	axel.lin@...il.com, broonie@...nsource.wolfsonmicro.com,
	marek.vasut@...il.com, devel@...verdev.osuosl.org,
	kevin.wells@....com, srinivas.bakki@....com
Subject: Re: [PATCH v2 1/8] ohci-nxp: Driver cleanup

On 04/17/2012 10:57 PM, Dan Carpenter wrote:
> On Tue, Apr 17, 2012 at 07:08:20PM +0200, Roland Stigge wrote:
>> @@ -435,6 +436,7 @@ static int __devinit usb_hcd_nxp_probe(s
>>  	}
>>  
>>  	__raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
>> +	__raw_writel(__raw_readl(USB_CTRL) & ~USB_DEV_NEED_CLK_EN, USB_CTRL);
>>  
>>  	/* Set to enable all needed USB clocks */
>>  	__raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
> 
> What does this chunk do?  Is this part of the "* Fixed controller
> initialization (bits)" bullet point?  How does it affect the user?
> Should it be included in the 3.4 kernel?

Thanks for the hint! I will drop this hunk. Originally, it made sure
that USB_DEV_NEED_CLK_EN is disabled but due to another change:

usb_hcd_nxp_probe() {
...
__raw_writel(USB_SLAVE_HCLK_EN | PAD_CONTROL_LAST_DRIVEN, USB_CTRL);

this bit is already cleared anyway.

(Would have been uncritical for v3.4 anyway, relating only to the other
changes introduced in my 3.5 patches.)

Roland
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