linux-kernel - Re: [PATCH v1 1/4] clk: qcom: gdsc: Add support to enable retention of GSDCR

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Date:   Thu, 09 Apr 2020 13:06:55 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Taniya Das <tdas@...eaurora.org>
Cc:     David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>, devicetree@...r.kernel.org,
        robh@...nel.org, robh+dt@...nel.org,
        Taniya Das <tdas@...eaurora.org>
Subject: Re: [PATCH v1 1/4] clk: qcom: gdsc: Add support to enable retention of GSDCR

Quoting Taniya Das (2020-03-27 12:48:02)
> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
> index a250f59..cfe908f 100644
> --- a/drivers/clk/qcom/gdsc.c
> +++ b/drivers/clk/qcom/gdsc.c
> @@ -28,6 +28,7 @@
>  /* CFG_GDSCR */
>  #define GDSC_POWER_UP_COMPLETE         BIT(16)
>  #define GDSC_POWER_DOWN_COMPLETE       BIT(15)
> +#define GDSC_RETAIN_FF_ENABLE          BIT(11)
>  #define CFG_GDSCR_OFFSET               0x4
> 
>  /* Wait 2^n CXO cycles between all states. Here, n=2 (4 cycles). */
> @@ -202,6 +203,14 @@ static inline void gdsc_assert_reset_aon(struct gdsc *sc)
>         regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,
>                            GMEM_RESET_MASK, 0);
>  }
> +
> +static inline void gdsc_retain_ff_on(struct gdsc *sc)

Drop inline please.

> +{
> +       u32 mask = RETAIN_FF_ENABLE;

Is this supposed to be GDSC_RETAIN_FF_ENABLE?

> +
> +       regmap_update_bits(sc->regmap, sc->gdscr, mask, mask);
> +}
> +
>  static int gdsc_enable(struct generic_pm_domain *domain)
>  {
>         struct gdsc *sc = domain_to_gdsc(domain);
> @@ -254,6 +263,9 @@ static int gdsc_enable(struct generic_pm_domain *domain)
>                 udelay(1);
>         }
> 
> +       if (sc->flags & RETAIN_FF_ENABLE)
> +               gdsc_retain_ff_on(sc);
> +
>         return 0;
>  }
> 
> diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
> index 64cdc8c..8604d44 100644
> --- a/drivers/clk/qcom/gdsc.h
> +++ b/drivers/clk/qcom/gdsc.h
> @@ -49,6 +49,7 @@ struct gdsc {
>  #define AON_RESET      BIT(4)
>  #define POLL_CFG_GDSCR BIT(5)
>  #define ALWAYS_ON      BIT(6)
> +#define RETAIN_FF_ENABLE       BIT(7)

This is a flag, not a register bit presumably.

>         struct reset_controller_dev     *rcdev;
>         unsigned int                    *resets;
>         unsigned int                    reset_count;