linux-kernel - Re: [PATCH] clk: tegra30: Don't wait for PLL

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Date:	Mon, 5 Aug 2013 16:04:56 +0300
From:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
To:	Prashant Gaikwad <pgaikwad@...dia.com>
CC:	Stephen Warren <swarren@...dotorg.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	"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>
Subject: Re: [PATCH] clk: tegra30: Don't wait for PLL_U lock bit

On 08/05/2013 09:38 AM, Prashant Gaikwad wrote:
> On Thursday 01 August 2013 02:34 AM, Stephen Warren wrote:
>> On 07/31/2013 11:42 AM, Tuomas Tynkkynen wrote:
>>> The lock bit on PLL_U does not seem to be working correctly and
>>> sometimes never gets set when waiting for the PLL to come up.
>>> Remove the TEGRA_PLL_USE_LOCK flag to use a constant delay.
>> Peter, Prashant,
>>
>> I think you said that the lock bits should work on Tegra30 (albeit they
>> don't on Tegra20)? Can you remind me if the do/don't?
>>
>> If Peter and Prashant are OK with this patch, feel free to take my ack.
> 
> Hi Tuomas,
> 
> Sorry for the delayed response. Please make sure that avdd_usb_pll 
> regulator is enabled before enabling PLLU and utmip parameters are 
> configured properly.

As far as I can see, avdd_usb_pll is connected to the vio_reg regulator on Cardhu,
which is marked as regulator-always-on. And the same regulator is connected to
eg. VDDIO_UART on the chip, so I presume almost nothing would work if that regulator
would not be on...

> If this this regulator is not enabled then you will get this kind of 
> timeout when enabling PLLU.
> 
> Thanks,
> Prashant
> 
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