On Fri 23 Mar 01:26 PDT 2018, Rajendra Nayak wrote:
> Some GDSCs might have software control to turn them off, but we might
> want to keep them enabled always, in some cases because of lack of
> support in kernel to handle a graceful turning off/on of such GDSCs.
> Most common instances would be the GDCSs which power up the noc/bus
> fabrics, which need bus drivers to handle them and atleast support for
> which is missing on all qcom SoCs.
>
> Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Regards,
Bjorn
> ---
> drivers/clk/qcom/gdsc.c | 8 ++++++++
> drivers/clk/qcom/gdsc.h | 1 +
> 2 files changed, 9 insertions(+)
>
> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
> index a4f3580587b7..15f4bb5efd68 100644
> --- a/drivers/clk/qcom/gdsc.c
> +++ b/drivers/clk/qcom/gdsc.c
> @@ -291,6 +291,14 @@ static int gdsc_init(struct gdsc *sc)
> if ((sc->flags & VOTABLE) && on)
> gdsc_enable(&sc->pd);
>
> + /* If ALWAYS_ON GDSCs are not ON, turn them ON */
> + if (sc->flags & ALWAYS_ON) {
> + if (!on)
> + gdsc_enable(&sc->pd);
> + on = true;
> + sc->pd.flags |= GENPD_FLAG_ALWAYS_ON;
> + }
> +
> if (on || (sc->pwrsts & PWRSTS_RET))
> gdsc_force_mem_on(sc);
> else
> diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
> index 39648348e5ec..7fd78cec7e5b 100644
> --- a/drivers/clk/qcom/gdsc.h
> +++ b/drivers/clk/qcom/gdsc.h
> @@ -53,6 +53,7 @@ struct gdsc {
> #define VOTABLE BIT(0)
> #define CLAMP_IO BIT(1)
> #define HW_CTRL BIT(2)
> +#define ALWAYS_ON BIT(3)
> struct reset_controller_dev *rcdev;
> unsigned int *resets;
> unsigned int reset_count;
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>
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