linux-kernel - Re: [PATCH 1/1] clk: tegra: read correct iddq register in PLL

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Message-ID: <555CC142.3010707@nvidia.com>
Date:	Wed, 20 May 2015 13:15:46 -0400
From:	Rhyland Klein <rklein@...dia.com>
To:	Bill Huang <bilhuang@...dia.com>, <pdeschrijver@...dia.com>
CC:	<mturquette@...aro.org>, <swarren@...dotorg.org>,
	<thierry.reding@...il.com>, <pwalmsley@...dia.com>,
	<linux-clk@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] clk: tegra: read correct iddq register in PLL_SS
 registration

On 5/18/2015 7:03 AM, Bill Huang wrote:
> This fixes bug in tegra_clk_register_pllss() which mistakenly assume the
> iddq register is the PLL base address.
> 
> Signed-off-by: Bill Huang <bilhuang@...dia.com>
> ---
>  drivers/clk/tegra/clk-pll.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
> index 05c6d08..f225325 100644
> --- a/drivers/clk/tegra/clk-pll.c
> +++ b/drivers/clk/tegra/clk-pll.c
> @@ -1826,7 +1826,7 @@ struct clk *tegra_clk_register_pllss(const char *name, const char *parent_name,
>  	struct clk *clk, *parent;
>  	struct tegra_clk_pll_freq_table cfg;
>  	unsigned long parent_rate;
> -	u32 val;
> +	u32 val, val_iddq;
>  	int i;
>  
>  	if (!pll_params->div_nmp)
> @@ -1874,14 +1874,17 @@ struct clk *tegra_clk_register_pllss(const char *name, const char *parent_name,
>  	pll_writel(PLLSS_CTRL1_DEFAULT, pll_params->ext_misc_reg[2], pll);
>  
>  	val = pll_readl_base(pll);
> +	val_iddq = readl_relaxed(clk_base + pll_params->iddq_reg);

You could/should likely use pll_readl(pll_params->iddq_reg, pll) here.

>  	if (val & PLL_BASE_ENABLE) {
> -		if (val & BIT(pll_params->iddq_bit_idx)) {
> +		if (val_iddq & BIT(pll_params->iddq_bit_idx)) {
>  			WARN(1, "%s is on but IDDQ set\n", name);
>  			kfree(pll);
>  			return ERR_PTR(-EINVAL);
>  		}
> -	} else
> -		val |= BIT(pll_params->iddq_bit_idx);
> +	} else {
> +		val_iddq |= BIT(pll_params->iddq_bit_idx);
> +		writel_relaxed(val_iddq, clk_base + pll_params->iddq_reg);

likewise you can use pll_writel(val_iddq, pll_params->iddq_reg, pll) here.

-rhyland


-- 
nvpublic
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