linux-kernel - Re: [PATCH v5 01/10] clk: tegra: Refactor PLL programming code

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Message-ID: <51109BB3.8000706@nvidia.com>
Date:	Tue, 5 Feb 2013 11:12:11 +0530
From:	Prashant Gaikwad <pgaikwad@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Simon Glass <sjg@...omium.org>,
	Mike Turquette <mturquette@...aro.org>,
	Joseph Lo <josephl@...dia.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 01/10] clk: tegra: Refactor PLL programming code

On Monday 04 February 2013 08:02 PM, Peter De Schrijver wrote:
> On Mon, Feb 04, 2013 at 07:06:47AM +0100, Prashant Gaikwad wrote:
>> On Friday 01 February 2013 03:48 PM, Peter De Schrijver wrote:
> ...
>
>>> -static int clk_pll_wait_for_lock(struct tegra_clk_pll *pll,
>>> -                                void __iomem *lock_addr, u32 lock_bit_idx)
>>> +static int clk_pll_wait_for_lock(struct tegra_clk_pll *pll)
>>>    {
>>>           int i;
>>> -       u32 val;
>>> +       u32 val, lock_bit;
>>> +       void __iomem *lock_addr;
>>>
>>>           if (!(pll->flags & TEGRA_PLL_USE_LOCK)) {
>>>                   udelay(pll->params->lock_delay);
>>>                   return 0;
>>>           }
>>>
>>> +       lock_addr = pll->clk_base + pll->params->base_reg;
>> This will not work for PLLE. Lock bit for PLLE is in misc register.
>>
>>> +       lock_bit = BIT(pll->params->lock_bit_idx);
>>> +
>>>           for (i = 0; i < pll->params->lock_delay; i++) {
>>>                   val = readl_relaxed(lock_addr);
>>> -               if (val & BIT(lock_bit_idx)) {
>>> +               if (val & lock_bit) {
>> Need to change the lock bit idx parameter for Tegra20 and Tegra30 PLLs
>> else this patch will break those.
>>
> Looking at commit 37c26a906527b8a6a252614ca83d21ad318c4e84 and commit
> b08e8c0ecc42afa3a2e1019851af741980dd5a6b, these fields seem correctly
> initialized for both Tegra20 and Tegra30? Or am I missing something?

Ohh, I missed to read

lock_bit = BIT(pll->params->lock_bit_idx);


Am I missing something about PLLE lock_addr also?

> Thanks,
>
> Peter.

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