On Tue, May 28, 2019 at 04:08:50PM -0700, Sowjanya Komatineni wrote:
> This patch adds support for suspend and resume for DFLL clock.
>
> Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
> ---
> drivers/clk/tegra/clk-dfll.c | 82 ++++++++++++++++++++++++++++++++++++++++++++
> drivers/clk/tegra/clk-dfll.h | 2 ++
> 2 files changed, 84 insertions(+)
>
> diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c
> index 1fc71baae13b..d92a5a05fbbc 100644
> --- a/drivers/clk/tegra/clk-dfll.c
> +++ b/drivers/clk/tegra/clk-dfll.c
> @@ -286,6 +286,7 @@ struct tegra_dfll {
> unsigned long dvco_rate_min;
>
> enum dfll_ctrl_mode mode;
> + enum dfll_ctrl_mode resume_mode;
> enum dfll_tune_range tune_range;
> struct dentry *debugfs_dir;
> struct clk_hw dfll_clk_hw;
> @@ -1873,6 +1874,87 @@ static int dfll_fetch_common_params(struct tegra_dfll *td)
> }
>
> /*
> + * tegra_dfll_suspend
> + * @pdev: DFLL instance
> + *
> + * dfll controls clock/voltage to other devices, including CPU. Therefore,
> + * dfll driver pm suspend callback does not stop cl-dvfs operations. It is
> + * only used to enforce cold voltage limit, since SoC may cool down during
> + * suspend without waking up. The correct temperature zone after suspend will
> + * be updated via dfll cooling device interface during resume of temperature
> + * sensor.
Temperature dependent cl-dvfs is not yet implemented in upstream, so
leave out the part about cold voltage limits and temperature zones.
Peter.
