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From: Dong Aisheng <dongas86@gmail.com>
To: Stephen Boyd <sboyd@kernel.org>
Cc: Dong Aisheng <aisheng.dong@nxp.com>,
	linux-clk <linux-clk@vger.kernel.org>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
	<linux-arm-kernel@lists.infradead.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Fabio Estevam <fabio.estevam@nxp.com>,
	dl-linux-imx <linux-imx@nxp.com>,
	Sascha Hauer <kernel@pengutronix.de>
Subject: Re: [PATCH V4 11/11] clk: imx: lpcg: add suspend/resume support
Date: Mon, 9 Sep 2019 19:39:43 +0800
Message-ID: <CAA+hA=TApgehM8kTdA2Py5Uuiy8=5eG7GvuyhUdPrFj_SEkR_g@mail.gmail.com> (raw)
In-Reply-To: <20190906171454.167BF20640@mail.kernel.org>

On Sat, Sep 7, 2019 at 9:22 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Dong Aisheng (2019-08-20 04:13:25)
> > diff --git a/drivers/clk/imx/clk-lpcg-scu.c b/drivers/clk/imx/clk-lpcg-scu.c
> > index 3c092a0..4df0818 100644
> > --- a/drivers/clk/imx/clk-lpcg-scu.c
> > +++ b/drivers/clk/imx/clk-lpcg-scu.c
> > @@ -33,6 +33,9 @@ struct clk_lpcg_scu {
> >         void __iomem *reg;
> >         u8 bit_idx;
> >         bool hw_gate;
> > +
> > +       /* for state save&restore */
> > +       u32 state;
> >  };
> >
> >  #define to_clk_lpcg_scu(_hw) container_of(_hw, struct clk_lpcg_scu, hw)
> > @@ -112,5 +115,35 @@ struct clk_hw *__imx_clk_lpcg_scu(struct device *dev, const char *name,
> >                 hw = ERR_PTR(ret);
> >         }
> >
> > +       if (dev)
> > +               dev_set_drvdata(dev, clk);
> > +
> >         return hw;
> >  }
> > +
> > +int __maybe_unused imx_clk_lpcg_scu_suspend(struct device *dev)
>
> static?
>
> > +{
> > +       struct clk_lpcg_scu *clk = dev_get_drvdata(dev);
> > +
> > +       clk->state = readl_relaxed(clk->reg);
> > +       dev_dbg(dev, "save lpcg state 0x%x\n", clk->state);
> > +
> > +       return 0;
> > +}
> > +
> > +int __maybe_unused imx_clk_lpcg_scu_resume(struct device *dev)
>
> static?
>

Will fix.

> > +{
> > +       struct clk_lpcg_scu *clk = dev_get_drvdata(dev);
> > +
> > +       /* FIXME: double write in case a failure */
>
> What does this mean? Sometimes writes don't work unless the CPU issues
> them twice?
>

Yes, it's a hardware timing issues.

Regards
Aisheng

> > +       writel(clk->state, clk->reg);
> > +       writel(clk->state, clk->reg);
> > +       dev_dbg(dev, "restore lpcg state 0x%x\n", clk->state);
> > +
> > +       return 0;
> > +}
> > +
> > +const struct dev_pm_ops imx_clk_lpcg_scu_pm_ops = {
> > +       SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_clk_lpcg_scu_suspend,
> > +                                     imx_clk_lpcg_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
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 [this message]
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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