From: Sowjanya Komatineni Date: Fri, 16 Aug 2019 19:41:48 +0000 (-0700) Subject: clk: tegra: divider: Save and restore divider rate X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d64422d93dca8fb630a132b0c24680c82c51788b;p=linux.git clk: tegra: divider: Save and restore divider rate 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. Acked-by: Thierry Reding Reviewed-by: Dmitry Osipenko Signed-off-by: Sowjanya Komatineni Signed-off-by: Thierry Reding --- diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c index e76731fb7d696..ca0de5f11f845 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,