linux-kernel - Re: [PATCH v7 03/20] clk: tegra: divider: Save and restore divider rate

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Date:   Wed, 31 Jul 2019 13:49:04 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com,
        linus.walleij@...aro.org, stefan@...er.ch, mark.rutland@....com
Cc:     pdeschrijver@...dia.com, pgaikwad@...dia.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        jckuo@...dia.com, josephl@...dia.com, talho@...dia.com,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        mperttunen@...dia.com, spatra@...dia.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v7 03/20] clk: tegra: divider: Save and restore divider
 rate

31.07.2019 3:20, Sowjanya Komatineni пишет:
> This patch implements context restore for clock divider.
> 
> During system suspend, core power goes off and looses the settings
> of the Tegra CAR controller registers.
> 
> So on resume, clock dividers are restored back for normal operation.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/clk/tegra/clk-divider.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c
> index e76731fb7d69..ca0de5f11f84 100644
> --- a/drivers/clk/tegra/clk-divider.c
> +++ b/drivers/clk/tegra/clk-divider.c
> @@ -109,10 +109,21 @@ static int clk_frac_div_set_rate(struct clk_hw *hw, unsigned long rate,
>  	return 0;
>  }
>  
> +static void clk_divider_restore_context(struct clk_hw *hw)
> +{
> +	struct clk_hw *parent = clk_hw_get_parent(hw);
> +	unsigned long parent_rate = clk_hw_get_rate(parent);
> +	unsigned long rate = clk_hw_get_rate(hw);
> +
> +	if (clk_frac_div_set_rate(hw, rate, parent_rate) < 0)
> +		WARN_ON(1);
> +}
> +
>  const struct clk_ops tegra_clk_frac_div_ops = {
>  	.recalc_rate = clk_frac_div_recalc_rate,
>  	.set_rate = clk_frac_div_set_rate,
>  	.round_rate = clk_frac_div_round_rate,
> +	.restore_context = clk_divider_restore_context,
>  };
>  
>  struct clk *tegra_clk_register_divider(const char *name,
> 

Reviewed-by: Dmitry Osipenko <digetx@...il.com>