On Wed, 1 Nov 2023 at 11:06, Abel Vesa <abel.vesa@xxxxxxxxxx> wrote:
>
> From: Jagadeesh Kona <quic_jkona@xxxxxxxxxxx>
>
> Add support for set and get hwmode callbacks to switch the GDSC between
> SW and HW modes. Currently, the GDSC is moved to HW control mode
> using HW_CTRL flag and if this flag is present, GDSC is moved to HW
> mode as part of GDSC enable itself. The intention is to keep the
> HW_CTRL flag functionality as is, since many older chipsets still use
> this flag.
>
> Introduce a new HW_CTRL_TRIGGER flag to switch the GDSC back and forth
> between HW/SW modes dynamically at runtime. If HW_CTRL_TRIGGER flag is
> present, register set_hwmode_dev callback to switch the GDSC mode which
> can be invoked from consumer drivers using dev_pm_genpd_set_hwmode
> function. Unlike HW_CTRL flag, HW_CTRL_TRIGGER won't move the GDSC to HW
> control mode as part of GDSC enable itself, GDSC will be moved to HW
> control mode only when consumer driver explicity calls
> dev_pm_genpd_set_hwmode to switch to HW mode. Also add the
> dev_pm_genpd_get_hwmode to allow the consumers to read the actual
> HW/SW mode from hardware.
Can we add two new flags:
- HW_CTRL_TRIGGER
- DEFAULT_HW_TRIGGER
And then define HW_CTRL as HW_CTRL_TRIGGER | DEFAULT_HW_TRIGGER ?
This way older platforms will keep existing behaviour, but can
gradually migrate to the new callbacks?
>
> Signed-off-by: Jagadeesh Kona <quic_jkona@xxxxxxxxxxx>
> Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> ---
> drivers/clk/qcom/gdsc.c | 32 ++++++++++++++++++++++++++++++++
> drivers/clk/qcom/gdsc.h | 1 +
> 2 files changed, 33 insertions(+)
>
> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
> index 5358e28122ab..c763524cd5da 100644
> --- a/drivers/clk/qcom/gdsc.c
> +++ b/drivers/clk/qcom/gdsc.c
> @@ -363,6 +363,34 @@ static int gdsc_disable(struct generic_pm_domain *domain)
> return 0;
> }
>
> +static int gdsc_set_hwmode(struct generic_pm_domain *domain, struct device *dev, bool mode)
> +{
> + struct gdsc *sc = domain_to_gdsc(domain);
> +
> + if (sc->rsupply && !regulator_is_enabled(sc->rsupply)) {
> + pr_err("Cannot set mode while parent is disabled\n");
> + return -EIO;
> + }
> +
> + return gdsc_hwctrl(sc, mode);
> +}
> +
> +static bool gdsc_get_hwmode(struct generic_pm_domain *domain, struct device *dev)
> +{
> + struct gdsc *sc = domain_to_gdsc(domain);
> + u32 val;
> + int ret;
> +
> + ret = regmap_read(sc->regmap, sc->gdscr, &val);
> + if (ret)
> + return ret;
> +
> + if (val & HW_CONTROL_MASK)
> + return true;
> +
> + return false;
> +}
> +
> static int gdsc_init(struct gdsc *sc)
> {
> u32 mask, val;
> @@ -451,6 +479,10 @@ static int gdsc_init(struct gdsc *sc)
> sc->pd.power_off = gdsc_disable;
> if (!sc->pd.power_on)
> sc->pd.power_on = gdsc_enable;
> + if (sc->flags & HW_CTRL_TRIGGER) {
> + sc->pd.set_hwmode_dev = gdsc_set_hwmode;
> + sc->pd.get_hwmode_dev = gdsc_get_hwmode;
> + }
>
> ret = pm_genpd_init(&sc->pd, NULL, !on);
> if (ret)
> diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
> index 803512688336..1e2779b823d1 100644
> --- a/drivers/clk/qcom/gdsc.h
> +++ b/drivers/clk/qcom/gdsc.h
> @@ -67,6 +67,7 @@ struct gdsc {
> #define ALWAYS_ON BIT(6)
> #define RETAIN_FF_ENABLE BIT(7)
> #define NO_RET_PERIPH BIT(8)
> +#define HW_CTRL_TRIGGER BIT(9)
> struct reset_controller_dev *rcdev;
> unsigned int *resets;
> unsigned int reset_count;
>
> --
> 2.34.1
>
--
With best wishes
Dmitry
