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@xxxxxxxxxx>
> ---
> 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@xxxxxxxxx>
