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From: Stephen Boyd <sboyd@kernel.org>
To: Dong Aisheng <aisheng.dong@nxp.com>, linux-clk@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org, mturquette@baylibre.com,
	shawnguo@kernel.org, fabio.estevam@nxp.com, linux-imx@nxp.com,
	kernel@pengutronix.de, Dong Aisheng <aisheng.dong@nxp.com>
Subject: Re: [PATCH V4 07/11] clk: imx: scu: add suspend/resume support
Date: Fri, 06 Sep 2019 10:09:43 -0700
Message-ID: <20190906170944.B861620578@mail.kernel.org> (raw)
In-Reply-To: <1566299605-15641-8-git-send-email-aisheng.dong@nxp.com>

Quoting Dong Aisheng (2019-08-20 04:13:21)
> Clock state will be lost when its power domain is completely off
> during system suspend/resume. So we save and restore the state
> accordingly in suspend/resume callback.

And this doesn't need any coordination with other clks in the clk tree
right?

> diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
> index edc39d7..8d9cfa2 100644
> --- a/drivers/clk/imx/clk-scu.c
> +++ b/drivers/clk/imx/clk-scu.c
> @@ -46,6 +46,10 @@ struct clk_scu {
>         struct clk_hw hw;
>         u16 rsrc_id;
>         u8 clk_type;
> +
> +       /* for state save&restore */
> +       bool is_enabled;
> +       u32 rate;
>  };
>  
>  /*
> @@ -425,6 +429,9 @@ struct clk_hw *__imx_clk_scu(struct device *dev, const char *name,
>                 hw = ERR_PTR(ret);
>         }
>  
> +       if (dev)
> +               dev_set_drvdata(dev, clk);
> +
>         return hw;
>  }
>  
> @@ -481,10 +488,52 @@ static int imx_clk_scu_probe(struct platform_device *pdev)
>         return 0;
>  }
>  
> +int __maybe_unused imx_clk_scu_suspend(struct device *dev)

static?

> +{
> +       struct clk_scu *clk = dev_get_drvdata(dev);
> +
> +       clk->rate = clk_hw_get_rate(&clk->hw);
> +       clk->is_enabled = clk_hw_is_enabled(&clk->hw);
> +
> +       if (clk->rate)
> +               dev_dbg(dev, "save rate %d\n", clk->rate);
> +
> +       if (clk->is_enabled)
> +               dev_dbg(dev, "save enabled state\n");
> +
> +       return 0;
> +}
> +
> +int __maybe_unused imx_clk_scu_resume(struct device *dev)

static?

> +{
> +       struct clk_scu *clk = dev_get_drvdata(dev);
> +       int ret = 0;
> +
> +       if (clk->rate) {
> +               ret = clk_scu_set_rate(&clk->hw, clk->rate, 0);
> +               dev_dbg(dev, "restore rate %d %s\n", clk->rate,
> +                       !ret ? "success" : "failed");
> +       }
> +
> +       if (clk->is_enabled) {
> +               ret = clk_scu_prepare(&clk->hw);
> +               dev_dbg(dev, "restore enabled state %s\n",
> +                       !ret ? "success" : "failed");
> +       }
> +
> +       return ret;
> +}
> +
> +const struct dev_pm_ops imx_clk_scu_pm_ops = {

static?

> +       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_clk_scu_suspend,
> +                                     imx_clk_scu_resume)
> +};
> +

  reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 11:13 [PATCH V4 00/11] clk: imx8: add new clock binding for better pm support Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 01/11] dt-bindings: firmware: imx-scu: new binding to parse clocks from device tree Dong Aisheng
2019-08-24 19:19   ` Shawn Guo
2019-08-26  3:24     ` Aisheng Dong
2019-08-27 17:04   ` Rob Herring
2019-09-06 16:56   ` Stephen Boyd
2019-08-20 11:13 ` [PATCH V4 02/11] dt-bindings: clock: imx-lpcg: add support " Dong Aisheng
2019-08-24 19:21   ` Shawn Guo
2019-08-26  3:14     ` Aisheng Dong
2019-08-26  3:21     ` Aisheng Dong
2019-08-27 17:05   ` Rob Herring
2019-09-06 17:00   ` Stephen Boyd
2019-08-20 11:13 ` [PATCH V4 03/11] clk: imx: scu: add two cells binding support Dong Aisheng
2019-09-06 17:06   ` Stephen Boyd
2019-09-09 10:23     ` Dong Aisheng
2019-09-16 18:44       ` Stephen Boyd
2019-11-17 12:07         ` Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 04/11] clk: imx: scu: bypass cpu power domains Dong Aisheng
2019-09-06 17:07   ` Stephen Boyd
2019-09-09 10:24     ` Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 05/11] clk: imx: scu: allow scu clk to take device pointer Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 06/11] clk: imx: scu: add runtime pm support Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 07/11] clk: imx: scu: add suspend/resume support Dong Aisheng
2019-09-06 17:09   ` Stephen Boyd [this message]
2019-09-09 10:35     ` Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 08/11] clk: imx: imx8qxp-lpcg: add parsing clocks from device tree Dong Aisheng
2019-09-06 17:13   ` Stephen Boyd
2019-09-09 11:23     ` Dong Aisheng
2019-09-16 18:45       ` Stephen Boyd
2019-11-17 12:08         ` Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 09/11] clk: imx: lpcg: allow lpcg clk to take device pointer Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 10/11] clk: imx: clk-imx8qxp-lpcg: add runtime pm support Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 11/11] clk: imx: lpcg: add suspend/resume support Dong Aisheng
2019-09-06 17:14   ` Stephen Boyd
2019-09-09 11:39     ` Dong Aisheng
2019-09-09 12:21 ` [PATCH V4 00/11] clk: imx8: add new clock binding for better pm support Oliver Graute

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