09.08.2019 2:46, Sowjanya Komatineni пишет: > This patch implements save and restore of PLL context. > > During system suspend, core power goes off and looses the settings > of the Tegra CAR controller registers. > > So during suspend entry pll context is stored and on resume it is > restored back along with its state. > > Acked-by: Thierry Reding <[email protected]> > Signed-off-by: Sowjanya Komatineni <[email protected]> > --- > drivers/clk/tegra/clk-pll.c | 88 > ++++++++++++++++++++++++++++----------------- > drivers/clk/tegra/clk.h | 2 ++ > 2 files changed, 58 insertions(+), 32 deletions(-) > > diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c > index 1583f5fc992f..e52add2bbdbb 100644 > --- a/drivers/clk/tegra/clk-pll.c > +++ b/drivers/clk/tegra/clk-pll.c > @@ -1008,6 +1008,28 @@ static unsigned long clk_plle_recalc_rate(struct > clk_hw *hw, > return rate; > } > > +static void tegra_clk_pll_restore_context(struct clk_hw *hw) > +{ > + struct tegra_clk_pll *pll = to_clk_pll(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); > + u32 val; > + > + if (clk_pll_is_enabled(hw)) > + return; > + > + if (pll->params->set_defaults) > + pll->params->set_defaults(pll); > + > + clk_pll_set_rate(hw, rate, parent_rate); > + > + if (!__clk_get_enable_count(hw->clk)) > + clk_pll_disable(hw); > + else > + clk_pll_enable(hw); > +}
drivers/clk/tegra/clk-pll.c: In function ‘tegra_clk_pll_restore_context’: drivers/clk/tegra/clk-pll.c:1024:6: warning: unused variable ‘val’ [-Wunused-variable] 1024 | u32 val;
