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Message-ID:
<DU0PR04MB941745611C0FE10E847C4B25882D2@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date: Mon, 18 Mar 2024 23:16:50 +0000
From: Peng Fan <peng.fan@....com>
To: "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>
CC: "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
> 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.
>
> 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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