linux-kernel - Re: [PATCH 1/1] clk: tegra: fix WARN_ON in PLL

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Message-ID: <CANLzEktZXkggY_6UbBBsU_9SB2eqsGRoBV138cDgBqo95BaWyw@mail.gmail.com>
Date:	Fri, 15 May 2015 10:12:56 -0700
From:	Benson Leung <bleung@...omium.org>
To:	Bill Huang <bilhuang@...dia.com>
Cc:	Peter De Schrijver <pdeschrijver@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Paul Walmsley <pwalmsley@...dia.com>,
	linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] clk: tegra: fix WARN_ON in PLL_RE registration

On Fri, May 15, 2015 at 5:07 AM, Bill Huang <bilhuang@...dia.com> wrote:
> This fixes two things.
>
> - Read the correct IDDQ register
> - Check the correct IDDQ bit position
>
> Signed-off-by: Bill Huang <bilhuang@...dia.com>

Reviewed-by: Benson Leung <bleung@...omium.org>

By the way, does it also make sense to do the same thing for
tegra_clk_register_pllss, which also reads the base register instead
of the specific iddq_reg from params?

> ---
>  drivers/clk/tegra/clk-pll.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
> index 05c6d08..734340e 100644
> --- a/drivers/clk/tegra/clk-pll.c
> +++ b/drivers/clk/tegra/clk-pll.c
> @@ -1630,7 +1630,8 @@ struct clk *tegra_clk_register_pllre(const char *name, const char *parent_name,
>
>         val = pll_readl_base(pll);
>         if (val & PLL_BASE_ENABLE)
> -               WARN_ON(val & pll_params->iddq_bit_idx);
> +               WARN_ON(readl_relaxed(clk_base + pll_params->iddq_reg) &
> +                               BIT(pll_params->iddq_bit_idx));
>         else {
>                 int m;
>
> --
> 1.9.1
>
> --
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-- 
Benson Leung
Software Engineer, Chrom* OS
bleung@...omium.org
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