linux-kernel - Re: [PATCH] clk: tegra: use pll_ref as the pll

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Message-ID: <20131030221833.GQ22111@tbergstrom-lnx.Nvidia.com>
Date:	Thu, 31 Oct 2013 00:18:33 +0200
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Mike Turquette <mturquette@...aro.org>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mark Zhang <markz@...dia.com>,
	Thierry Reding <treding@...dia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: tegra: use pll_ref as the pll_e parent

On Wed, Oct 30, 2013 at 04:41:41PM +0100, Stephen Warren wrote:
> On 10/29/2013 06:41 PM, Peter De Schrijver wrote:
> > Use pll_ref instead of pll_re_vco as the pll_e parent on Tegra114 and
> > Tegra124. Also add a pll_ref table entry for pll_e for Tegra114.
> 
> Why? What benefit does this give, or what bug does this fix?
> 

Otherrwise Tegra114 will crash on boot.

> > diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
> 
> >  	val_aux = pll_readl(pll_params->aux_reg, pll);
> >  
> >  	if (val & PLL_BASE_ENABLE) {
> > -		if (!(val_aux & PLLE_AUX_PLLRE_SEL))
> > +		if ((val_aux & PLLE_AUX_PLLRE_SEL) || (val_aux & val_aux))
> 
> Isn't "|| (val_aux & val_aux)" always true, at least if the value is
> non-zero? Either this should be simply "|| val_aux", or one of those two
> "val_aux" is the wrong thing.
> 

It should have been val_aux & PLLE_AUX_PLLP_SEL...

Cheers,

Peter.
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