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clk: imx: imx8mp: Add pm_runtime support for power saving
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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 <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Reviewed-by: Marc Kleine-Budde <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Abel Vesa <[email protected]>
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@TE-N-ShengjiuWang @abelvesa
TE-N-ShengjiuWang authored and abelvesa committed Apr 22, 2024
1 parent 4cece76 commit 1496dd4
Showing 1 changed file with 136 additions and 21 deletions.
157 changes: 136 additions & 21 deletions drivers/clk/imx/clk-imx8mp-audiomix.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7,17 +7,20 @@

#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>

#include "clk.h"

#define CLKEN0 0x000
#define CLKEN1 0x004
#define EARC 0x200
#define SAI1_MCLK_SEL 0x300
#define SAI2_MCLK_SEL 0x304
#define SAI3_MCLK_SEL 0x308
Expand All @@ -26,6 +29,11 @@
#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 SAIn_MCLK1_PARENT(n) \
static const struct clk_parent_data \
Expand Down Expand Up @@ -182,26 +190,82 @@ static struct clk_imx8mp_audiomix_sel sels[] = {
CLK_SAIn(7)
};

static const u16 audiomix_regs[] = {
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_priv {
void __iomem *base;
u32 regs_save[ARRAY_SIZE(audiomix_regs)];

/* Must be last */
struct clk_hw_onecell_data clk_data;
};

static void clk_imx8mp_audiomix_save_restore(struct device *dev, bool save)
{
struct clk_imx8mp_audiomix_priv *priv = dev_get_drvdata(dev);
void __iomem *base = priv->base;
int i;

if (save) {
for (i = 0; i < ARRAY_SIZE(audiomix_regs); i++)
priv->regs_save[i] = readl(base + audiomix_regs[i]);
} else {
for (i = 0; i < ARRAY_SIZE(audiomix_regs); i++)
writel(priv->regs_save[i], base + audiomix_regs[i]);
}
}

static int clk_imx8mp_audiomix_probe(struct platform_device *pdev)
{
struct clk_hw_onecell_data *priv;
struct clk_imx8mp_audiomix_priv *priv;
struct clk_hw_onecell_data *clk_hw_data;
struct device *dev = &pdev->dev;
void __iomem *base;
struct clk_hw *hw;
int i;
int i, ret;

priv = devm_kzalloc(dev,
struct_size(priv, hws, IMX8MP_CLK_AUDIOMIX_END),
struct_size(priv, clk_data.hws, IMX8MP_CLK_AUDIOMIX_END),
GFP_KERNEL);
if (!priv)
return -ENOMEM;

priv->num = IMX8MP_CLK_AUDIOMIX_END;
clk_hw_data = &priv->clk_data;
clk_hw_data->num = IMX8MP_CLK_AUDIOMIX_END;

base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);

priv->base = base;
dev_set_drvdata(dev, priv);

/*
* pm_runtime_enable needs to be called before clk register.
* That is to make core->rpm_enabled to be true for clock
* usage.
*/
pm_runtime_get_noresume(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);

for (i = 0; i < ARRAY_SIZE(sels); i++) {
if (sels[i].num_parents == 1) {
hw = devm_clk_hw_register_gate_parent_data(dev,
Expand All @@ -216,10 +280,12 @@ static int clk_imx8mp_audiomix_probe(struct platform_device *pdev)
0, NULL, NULL);
}

if (IS_ERR(hw))
return PTR_ERR(hw);
if (IS_ERR(hw)) {
ret = PTR_ERR(hw);
goto err_clk_register;
}

priv->hws[sels[i].clkid] = hw;
clk_hw_data->hws[sels[i].clkid] = hw;
}

/* SAI PLL */
Expand All @@ -228,39 +294,86 @@ static int clk_imx8mp_audiomix_probe(struct platform_device *pdev)
ARRAY_SIZE(clk_imx8mp_audiomix_pll_parents),
CLK_SET_RATE_NO_REPARENT, base + SAI_PLL_GNRL_CTL,
0, 2, 0, NULL, NULL);
priv->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL_REF_SEL] = hw;
clk_hw_data->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL_REF_SEL] = hw;

hw = imx_dev_clk_hw_pll14xx(dev, "sai_pll", "sai_pll_ref_sel",
base + 0x400, &imx_1443x_pll);
if (IS_ERR(hw))
return PTR_ERR(hw);
priv->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL] = hw;
if (IS_ERR(hw)) {
ret = PTR_ERR(hw);
goto err_clk_register;
}
clk_hw_data->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL] = hw;

hw = devm_clk_hw_register_mux_parent_data_table(dev,
"sai_pll_bypass", clk_imx8mp_audiomix_pll_bypass_sels,
ARRAY_SIZE(clk_imx8mp_audiomix_pll_bypass_sels),
CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT,
base + SAI_PLL_GNRL_CTL, 16, 1, 0, NULL, NULL);
if (IS_ERR(hw))
return PTR_ERR(hw);
priv->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL_BYPASS] = hw;
if (IS_ERR(hw)) {
ret = PTR_ERR(hw);
goto err_clk_register;
}

clk_hw_data->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL_BYPASS] = hw;

hw = devm_clk_hw_register_gate(dev, "sai_pll_out", "sai_pll_bypass",
0, base + SAI_PLL_GNRL_CTL, 13,
0, NULL);
if (IS_ERR(hw))
return PTR_ERR(hw);
priv->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL_OUT] = hw;
if (IS_ERR(hw)) {
ret = PTR_ERR(hw);
goto err_clk_register;
}
clk_hw_data->hws[IMX8MP_CLK_AUDIOMIX_SAI_PLL_OUT] = hw;

hw = devm_clk_hw_register_fixed_factor(dev, "sai_pll_out_div2",
"sai_pll_out", 0, 1, 2);
if (IS_ERR(hw))
return PTR_ERR(hw);
if (IS_ERR(hw)) {
ret = PTR_ERR(hw);
goto err_clk_register;
}

ret = devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_onecell_get,
clk_hw_data);
if (ret)
goto err_clk_register;

pm_runtime_put_sync(dev);
return 0;

err_clk_register:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
return ret;
}

static int clk_imx8mp_audiomix_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);

return 0;
}

static int clk_imx8mp_audiomix_runtime_suspend(struct device *dev)
{
clk_imx8mp_audiomix_save_restore(dev, true);

return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_onecell_get,
priv);
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 */ }
Expand All @@ -269,9 +382,11 @@ MODULE_DEVICE_TABLE(of, clk_imx8mp_audiomix_of_match);

static struct platform_driver clk_imx8mp_audiomix_driver = {
.probe = clk_imx8mp_audiomix_probe,
.remove = clk_imx8mp_audiomix_remove,
.driver = {
.name = "imx8mp-audio-blk-ctrl",
.of_match_table = clk_imx8mp_audiomix_of_match,
.pm = &clk_imx8mp_audiomix_pm_ops,
},
};

Expand Down

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