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Message-ID: <20240319073540.2zvwq7fvft3h6mbr@pengutronix.de>
Date: Tue, 19 Mar 2024 08:35:40 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Peng Fan <peng.fan@....com>
Cc: "S.J. Wang" <shengjiu.wang@....com>,
"abelvesa@...nel.org" <abelvesa@...nel.org>,
"mturquette@...libre.com" <mturquette@...libre.com>,
"sboyd@...nel.org" <sboyd@...nel.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>,
dl-linux-imx <linux-imx@....com>,
"shengjiu.wang@...il.com" <shengjiu.wang@...il.com>,
"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: imx: imx8mp: Add pm_runtime support for power saving
On 24-03-18, Peng Fan wrote:
> > Subject: [PATCH] clk: imx: imx8mp: Add pm_runtime support for power
> > saving
> >
> > Add pm_runtime support for power saving. In pm runtime suspend state the
> > registers will be reseted, so add registers save in pm runtime suspend and
> > restore them in pm runtime resume.
We had similar patches in our downstream repo but didn't upstream yet
since there was an clk-handing issue. IIRC the issue was regarding the
global clock-prepare lock and a circular dependency on it. Is this
resolved now?
Regards,
Marco
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
>
> Reviewed-by: Peng Fan <peng.fan@....com>
> > ---
> > drivers/clk/imx/clk-imx8mp-audiomix.c | 99 ++++++++++++++++++++++++++-
> > 1 file changed, 96 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/clk/imx/clk-imx8mp-audiomix.c b/drivers/clk/imx/clk-
> > imx8mp-audiomix.c
> > index 55ed211a5e0b..d2bf53e2aacf 100644
> > --- a/drivers/clk/imx/clk-imx8mp-audiomix.c
> > +++ b/drivers/clk/imx/clk-imx8mp-audiomix.c
> > @@ -7,10 +7,12 @@
> >
> > #include <linux/clk-provider.h>
> > #include <linux/device.h>
> > +#include <linux/io.h>
> > #include <linux/mod_devicetable.h>
> > #include <linux/module.h>
> > #include <linux/of.h>
> > #include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> >
> > #include <dt-bindings/clock/imx8mp-clock.h>
> >
> > @@ -18,6 +20,7 @@
> >
> > #define CLKEN0 0x000
> > #define CLKEN1 0x004
> > +#define EARC 0x200
> > #define SAI1_MCLK_SEL 0x300
> > #define SAI2_MCLK_SEL 0x304
> > #define SAI3_MCLK_SEL 0x308
> > @@ -26,6 +29,12 @@
> > #define SAI7_MCLK_SEL 0x314
> > #define PDM_SEL 0x318
> > #define SAI_PLL_GNRL_CTL 0x400
> > +#define SAI_PLL_FDIVL_CTL0 0x404
> > +#define SAI_PLL_FDIVL_CTL1 0x408
> > +#define SAI_PLL_SSCG_CTL 0x40C
> > +#define SAI_PLL_MNIT_CTL 0x410
> > +#define IPG_LP_CTRL 0x504
> > +#define REGS_NUM 16
> >
> > #define SAIn_MCLK1_PARENT(n) \
> > static const struct clk_parent_data \
> > @@ -182,13 +191,65 @@ static struct clk_imx8mp_audiomix_sel sels[] = {
> > CLK_SAIn(7)
> > };
> >
> > +struct clk_imx8mp_audiomix_regs {
> > + u32 regs_num;
> > + u32 regs_off[];
> > +};
> > +
> > +static const struct clk_imx8mp_audiomix_regs audiomix_regs = {
> > + .regs_num = REGS_NUM,
> > + .regs_off = {
> > + CLKEN0,
> > + CLKEN1,
> > + EARC,
> > + SAI1_MCLK_SEL,
> > + SAI2_MCLK_SEL,
> > + SAI3_MCLK_SEL,
> > + SAI5_MCLK_SEL,
> > + SAI6_MCLK_SEL,
> > + SAI7_MCLK_SEL,
> > + PDM_SEL,
> > + SAI_PLL_GNRL_CTL,
> > + SAI_PLL_FDIVL_CTL0,
> > + SAI_PLL_FDIVL_CTL1,
> > + SAI_PLL_SSCG_CTL,
> > + SAI_PLL_MNIT_CTL,
> > + IPG_LP_CTRL
> > + },
> > +};
> > +
> > +struct clk_imx8mp_audiomix_drvdata {
> > + void __iomem *base;
> > + u32 regs_save[REGS_NUM];
> > +};
> > +
> > +static void clk_imx8mp_audiomix_save_restore(struct device *dev, bool
> > +save) {
> > + struct clk_imx8mp_audiomix_drvdata *drvdata =
> > dev_get_drvdata(dev);
> > + void __iomem *base = drvdata->base;
> > + int i;
> > +
> > + if (save) {
> > + for (i = 0; i < audiomix_regs.regs_num; i++)
> > + drvdata->regs_save[i] = readl(base +
> > audiomix_regs.regs_off[i]);
> > + } else {
> > + for (i = 0; i < audiomix_regs.regs_num; i++)
> > + writel(drvdata->regs_save[i], base +
> > audiomix_regs.regs_off[i]);
> > + }
> > +}
> > +
> > static int clk_imx8mp_audiomix_probe(struct platform_device *pdev) {
> > + struct clk_imx8mp_audiomix_drvdata *drvdata;
> > struct clk_hw_onecell_data *priv;
> > struct device *dev = &pdev->dev;
> > void __iomem *base;
> > struct clk_hw *hw;
> > - int i;
> > + int i, ret;
> > +
> > + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> > + if (!drvdata)
> > + return -ENOMEM;
> >
> > priv = devm_kzalloc(dev,
> > struct_size(priv, hws,
> > IMX8MP_CLK_AUDIOMIX_END), @@ -202,6 +263,9 @@ static int
> > clk_imx8mp_audiomix_probe(struct platform_device *pdev)
> > if (IS_ERR(base))
> > return PTR_ERR(base);
> >
> > + drvdata->base = base;
> > + dev_set_drvdata(dev, drvdata);
> > +
> > for (i = 0; i < ARRAY_SIZE(sels); i++) {
> > if (sels[i].num_parents == 1) {
> > hw = devm_clk_hw_register_gate_parent_data(dev,
> > @@ -257,10 +321,38 @@ static int clk_imx8mp_audiomix_probe(struct
> > platform_device *pdev)
> > if (IS_ERR(hw))
> > return PTR_ERR(hw);
> >
> > - return devm_of_clk_add_hw_provider(&pdev->dev,
> > of_clk_hw_onecell_get,
> > - priv);
> > + ret = devm_of_clk_add_hw_provider(&pdev->dev,
> > of_clk_hw_onecell_get,
> > + priv);
> > + if (ret)
> > + return ret;
> > +
> > + pm_runtime_enable(&pdev->dev);
> > + clk_imx8mp_audiomix_save_restore(&pdev->dev, true);
> > +
> > + return 0;
> > }
> >
> > +static int clk_imx8mp_audiomix_runtime_suspend(struct device *dev) {
> > + clk_imx8mp_audiomix_save_restore(dev, true);
> > +
> > + return 0;
> > +}
> > +
> > +static int clk_imx8mp_audiomix_runtime_resume(struct device *dev) {
> > + clk_imx8mp_audiomix_save_restore(dev, false);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct dev_pm_ops clk_imx8mp_audiomix_pm_ops = {
> > + SET_RUNTIME_PM_OPS(clk_imx8mp_audiomix_runtime_suspend,
> > + clk_imx8mp_audiomix_runtime_resume, NULL)
> > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> > + pm_runtime_force_resume)
> > +};
> > +
> > static const struct of_device_id clk_imx8mp_audiomix_of_match[] = {
> > { .compatible = "fsl,imx8mp-audio-blk-ctrl" },
> > { /* sentinel */ }
> > @@ -272,6 +364,7 @@ static struct platform_driver
> > clk_imx8mp_audiomix_driver = {
> > .driver = {
> > .name = "imx8mp-audio-blk-ctrl",
> > .of_match_table = clk_imx8mp_audiomix_of_match,
> > + .pm = &clk_imx8mp_audiomix_pm_ops,
> > },
> > };
> >
> > --
> > 2.34.1
>
>
>
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