linux-kernel - Re: [PATCH 2/6] usb: phy: tegra: Fix wrong PHY parameters

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Date:	Fri, 2 Aug 2013 17:15:39 +0300
From:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"balbi@...com" <balbi@...com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>
Subject: Re: [PATCH 2/6] usb: phy: tegra: Fix wrong PHY parameters

On 08/02/2013 12:09 AM, Stephen Warren wrote:
> On 07/31/2013 11:41 AM, Tuomas Tynkkynen wrote:
>> Some of the PHY parameters are not set according to the TRMs:
>>
>> - UTMIP_FS_PREABMLE_J should be set, not cleared
>> - UTMIP_XCVR_LSBIAS_SEL should be cleared, not set
>> - UTMIP_PD_CHRG should be set in host mode and cleared in device mode
>> - UTMIP_XCVR_SETUP is a two-part field; the upper bits were not set
> 
>> diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
> 
>>  #define   UTMIP_XCVR_SETUP(x)			(((x) & 0xf) << 0)
>> +#define   UTMIP_XCVR_SETUP_MSB(x)		((((x) & 0x7f) >> 4) << 22)
> 
> You may as well s/0x7f/0x70/ since the shift clears the 4 LSBs. I'm
> pretty sure I mentioned this in downstream review. Perhaps check my
> review comments to see if anything else was missed?
> 

Well in my opinion that increases the risk of typoing the mask.
I'll fix along with the other things.
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