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clk: tegra: pllout: Save and restore pllout context 

This patch implements save and restore of pllout context.

During system suspend, core power goes off and looses the settings
of the Tegra CAR controller registers.

So during suspend entry the state of pllout is saved and on resume
it is restored back to have pllout in same state as before suspend.

pllout rate is saved and restore in clock divider so it will be at
same rate as before suspend when pllout state is restored.

Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Sowjanya Komatineni 2019-08-16 12:41:49 -07:00 committed by Thierry Reding
parent d64422d93d
commit fa62228240
1 changed files with 9 additions and 0 deletions
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9
drivers/clk/tegra/clk-pll-out.c
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@ -69,10 +69,19 @@ static void clk_pll_out_disable(struct clk_hw *hw)
spin_unlock_irqrestore(pll_out->lock, flags);
}
static void tegra_clk_pll_out_restore_context(struct clk_hw *hw)
{
if (!__clk_get_enable_count(hw->clk))
clk_pll_out_disable(hw);
else
clk_pll_out_enable(hw);
}
const struct clk_ops tegra_clk_pll_out_ops = {
.is_enabled = clk_pll_out_is_enabled,
.enable = clk_pll_out_enable,
.disable = clk_pll_out_disable,
.restore_context = tegra_clk_pll_out_restore_context,
};
struct clk *tegra_clk_register_pll_out(const char *name,