linux-kernel - Re: [PATCH v2 5/7] clk: tegra: don't warn for PLL defaults unnecessarily

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Message-ID: <b26752ac-5375-86af-8ce8-0be97b99c734@nvidia.com>
Date:   Mon, 27 Mar 2017 12:02:28 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        "Stephen Boyd" <sboyd@...eaurora.org>,
        Stephen Warren <swarren@...dotorg.org>,
        "Thierry Reding" <thierry.reding@...il.com>,
        Alexandre Courbot <gnurou@...il.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Rhyland Klein" <rklein@...dia.com>, <linux-clk@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 5/7] clk: tegra: don't warn for PLL defaults
 unnecessarily

Hi Peter,

On 23/02/17 10:44, Peter De Schrijver wrote:
> If the PLL is on, only warn if the defaults are not yet set. Otherwise be
> silent.
> 
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
>  drivers/clk/tegra/clk-tegra210.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
> index b7ef8a7..fe698d2 100644
> --- a/drivers/clk/tegra/clk-tegra210.c
> +++ b/drivers/clk/tegra/clk-tegra210.c
> @@ -502,7 +502,7 @@ static void tegra210_pllcx_set_defaults(const char *name,
>  	pllcx->params->defaults_set = true;
>  
>  	if (readl_relaxed(clk_base + pllcx->params->base_reg) &
> -			PLL_ENABLE) {
> +			PLL_ENABLE && !pllcx->params->defaults_set) {
>  		/* PLL is ON: only check if defaults already set */
>  		pllcx_check_defaults(pllcx->params);
>  		pr_warn("%s already enabled. Postponing set full defaults\n",

The above hunk is causing the Tegra210 Smaug boot to fail. Looking more
at the code, I believe that the above hunk is not correct, because
'defaults_set' is always true and this is now causing us to always reset
the PLL if in-use or not. I will send a patch to correct this.

Cheers
Jon

-- 
nvpublic