linux-kernel - Re: [PATCH] clk: tegra: Fix PLLE programming

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Date:	Mon, 31 Mar 2014 10:51:38 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Thierry Reding <thierry.reding@...il.com>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>
CC:	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: tegra: Fix PLLE programming

On 03/31/2014 08:45 AM, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> PLLE has M, N and P divider shift and width parameters that differ from
> the defaults. Furthermore, when clearing the M, N and P divider fields
> the corresponding masks were never shifted, thereby clearing only the
> lowest bits of the register. This lead to a situation where the PLLE
> programming would only work if the register hadn't been touched before.

> diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c

> @@ -730,8 +730,10 @@ static int clk_plle_enable(struct clk_hw *hw)
>  	if (pll->params->flags & TEGRA_PLLE_CONFIGURE) {
>  		/* configure dividers */
>  		val = pll_readl_base(pll);
> -		val &= ~(divm_mask(pll) | divn_mask(pll) | divp_mask(pll));
> -		val &= ~(PLLE_BASE_DIVCML_WIDTH << PLLE_BASE_DIVCML_SHIFT);
> +		val &= ~(divp_mask(pll) << PLLE_BASE_DIVP_SHIFT |
> +			 divn_mask(pll) << PLLE_BASE_DIVN_SHIFT |
> +			 divm_mask(pll) << PLLE_BASE_DIVM_SHIFT);

Shouldn't those shift values also be a macro/inline like
divm_shift(pll), since ...

> +static struct div_nmp pll_e_nmp = {
> +	.divn_shift = PLLE_BASE_DIVN_SHIFT,
> +	.divn_width = PLLE_BASE_DIVN_WIDTH,
> +	.divm_shift = PLLE_BASE_DIVM_SHIFT,
> +	.divm_width = PLLE_BASE_DIVM_WIDTH,
> +	.divp_shift = PLLE_BASE_DIVP_SHIFT,
> +	.divp_width = PLLE_BASE_DIVP_WIDTH,
> +};

... that table contains parameters for both width and shift values, not
just width values?

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