Re: [PATCH] i2c: mv64xxx: Add runtime PM support

From: Ondřej Jirman
Date: Thu Jan 28 2021 - 10:55:11 EST

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In reply to: Wolfram Sang: "Re: [PATCH] i2c: mv64xxx: Add runtime PM support"
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Hello Samuel,

On Thu, Jan 28, 2021 at 10:22:08AM +0100, Wolfram Sang wrote:
> On Sun, Jan 03, 2021 at 04:51:46AM -0600, Samuel Holland wrote:
> > To save power, gate the clock when the bus is inactive, during system
> > sleep, and during shutdown. On some platforms, specifically Allwinner
> > A13/A20, gating the clock implicitly resets the module as well. Since
> > the module already needs to be reset after some suspend/resume cycles,
> > it is simple enough to reset it during every runtime suspend/resume.
> >
> > Because the bus may be used by wakeup source IRQ threads, it needs to
> > be functional as soon as IRQs are enabled. Thus, its system PM hooks
> > need to run in the noirq phase.
> >
> > Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>

Tested-by: Ondrej Jirman <megous@xxxxxxxxxx>

I tried it on H3, H5, H6, A64, A83T and A13 based devices. This time it works on
my A13 pocketbook, too.

I get "mmc_erase: group start error -110, status 0x0" in dmesg on my 2 Orange Pi
3's soon after boot on 5.11-rc4 + this patch. Though I do get these without this
patch too. So those timeouts are unrelated.

I think it's comming from some f2fs background gc job doing trim and mmc
sometimes times out during that. It doesn't lead to corruption.

kind regards,
o.

> Gregory, what do you think?
>
> > ---
> > drivers/i2c/busses/i2c-mv64xxx.c | 120 ++++++++++++++++++++-----------
> > 1 file changed, 78 insertions(+), 42 deletions(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
> > index 5cfe70aedced..b03c344323d1 100644
> > --- a/drivers/i2c/busses/i2c-mv64xxx.c
> > +++ b/drivers/i2c/busses/i2c-mv64xxx.c
> > @@ -18,6 +18,7 @@
> > #include <linux/mv643xx_i2c.h>
> > #include <linux/platform_device.h>
> > #include <linux/pinctrl/consumer.h>
> > +#include <linux/pm_runtime.h>
> > #include <linux/reset.h>
> > #include <linux/io.h>
> > #include <linux/of.h>
> > @@ -717,6 +718,10 @@ mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
> > struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
> > int rc, ret = num;
> >
> > + rc = pm_runtime_resume_and_get(&adap->dev);
> > + if (rc)
> > + return rc;
> > +
> > BUG_ON(drv_data->msgs != NULL);
> > drv_data->msgs = msgs;
> > drv_data->num_msgs = num;
> > @@ -732,6 +737,9 @@ mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
> > drv_data->num_msgs = 0;
> > drv_data->msgs = NULL;
> >
> > + pm_runtime_mark_last_busy(&adap->dev);
> > + pm_runtime_put_autosuspend(&adap->dev);
> > +
> > return ret;
> > }
> >
> > @@ -828,7 +836,6 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
> > rc = PTR_ERR(drv_data->rstc);
> > goto out;
> > }
> > - reset_control_deassert(drv_data->rstc);
> >
> > /* Its not yet defined how timeouts will be specified in device tree.
> > * So hard code the value to 1 second.
> > @@ -893,6 +900,32 @@ static int mv64xxx_i2c_init_recovery_info(struct mv64xxx_i2c_data *drv_data,
> > return 0;
> > }
> >
> > +static int
> > +mv64xxx_i2c_runtime_suspend(struct device *dev)
> > +{
> > + struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
> > +
> > + reset_control_assert(drv_data->rstc);
> > + clk_disable_unprepare(drv_data->reg_clk);
> > + clk_disable_unprepare(drv_data->clk);
> > +
> > + return 0;
> > +}
> > +
> > +static int
> > +mv64xxx_i2c_runtime_resume(struct device *dev)
> > +{
> > + struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
> > +
> > + clk_prepare_enable(drv_data->clk);
> > + clk_prepare_enable(drv_data->reg_clk);
> > + reset_control_reset(drv_data->rstc);
> > +
> > + mv64xxx_i2c_hw_init(drv_data);
> > +
> > + return 0;
> > +}
> > +
> > static int
> > mv64xxx_i2c_probe(struct platform_device *pd)
> > {
> > @@ -920,18 +953,22 @@ mv64xxx_i2c_probe(struct platform_device *pd)
> >
> > /* Not all platforms have clocks */
> > drv_data->clk = devm_clk_get(&pd->dev, NULL);
> > - if (PTR_ERR(drv_data->clk) == -EPROBE_DEFER)
> > - return -EPROBE_DEFER;
> > - if (!IS_ERR(drv_data->clk))
> > - clk_prepare_enable(drv_data->clk);
> > + if (IS_ERR(drv_data->clk)) {
> > + if (PTR_ERR(drv_data->clk) == -EPROBE_DEFER)
> > + return -EPROBE_DEFER;
> > + drv_data->clk = NULL;
> > + }
> >
> > drv_data->reg_clk = devm_clk_get(&pd->dev, "reg");
> > - if (PTR_ERR(drv_data->reg_clk) == -EPROBE_DEFER)
> > - return -EPROBE_DEFER;
> > - if (!IS_ERR(drv_data->reg_clk))
> > - clk_prepare_enable(drv_data->reg_clk);
> > + if (IS_ERR(drv_data->reg_clk)) {
> > + if (PTR_ERR(drv_data->reg_clk) == -EPROBE_DEFER)
> > + return -EPROBE_DEFER;
> > + drv_data->reg_clk = NULL;
> > + }
> >
> > drv_data->irq = platform_get_irq(pd, 0);
> > + if (drv_data->irq < 0)
> > + return drv_data->irq;
> >
> > if (pdata) {
> > drv_data->freq_m = pdata->freq_m;
> > @@ -942,16 +979,12 @@ mv64xxx_i2c_probe(struct platform_device *pd)
> > } else if (pd->dev.of_node) {
> > rc = mv64xxx_of_config(drv_data, &pd->dev);
> > if (rc)
> > - goto exit_clk;
> > - }
> > - if (drv_data->irq < 0) {
> > - rc = drv_data->irq;
> > - goto exit_reset;
> > + return rc;
> > }
> >
> > rc = mv64xxx_i2c_init_recovery_info(drv_data, &pd->dev);
> > if (rc == -EPROBE_DEFER)
> > - goto exit_reset;
> > + return rc;
> >
> > drv_data->adapter.dev.parent = &pd->dev;
> > drv_data->adapter.algo = &mv64xxx_i2c_algo;
> > @@ -962,7 +995,14 @@ mv64xxx_i2c_probe(struct platform_device *pd)
> > platform_set_drvdata(pd, drv_data);
> > i2c_set_adapdata(&drv_data->adapter, drv_data);
> >
> > - mv64xxx_i2c_hw_init(drv_data);
> > + pm_runtime_set_autosuspend_delay(&pd->dev, MSEC_PER_SEC);
> > + pm_runtime_use_autosuspend(&pd->dev);
> > + pm_runtime_enable(&pd->dev);
> > + if (!pm_runtime_enabled(&pd->dev)) {
> > + rc = mv64xxx_i2c_runtime_resume(&pd->dev);
> > + if (rc)
> > + goto exit_disable_pm;
> > + }
> >
> > rc = request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
> > MV64XXX_I2C_CTLR_NAME, drv_data);
> > @@ -970,7 +1010,7 @@ mv64xxx_i2c_probe(struct platform_device *pd)
> > dev_err(&drv_data->adapter.dev,
> > "mv64xxx: Can't register intr handler irq%d: %d\n",
> > drv_data->irq, rc);
> > - goto exit_reset;
> > + goto exit_disable_pm;
> > } else if ((rc = i2c_add_numbered_adapter(&drv_data->adapter)) != 0) {
> > dev_err(&drv_data->adapter.dev,
> > "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
> > @@ -981,54 +1021,50 @@ mv64xxx_i2c_probe(struct platform_device *pd)
> >
> > exit_free_irq:
> > free_irq(drv_data->irq, drv_data);
> > -exit_reset:
> > - reset_control_assert(drv_data->rstc);
> > -exit_clk:
> > - clk_disable_unprepare(drv_data->reg_clk);
> > - clk_disable_unprepare(drv_data->clk);
> > +exit_disable_pm:
> > + pm_runtime_disable(&pd->dev);
> > + if (!pm_runtime_status_suspended(&pd->dev))
> > + mv64xxx_i2c_runtime_suspend(&pd->dev);
> >
> > return rc;
> > }
> >
> > static int
> > -mv64xxx_i2c_remove(struct platform_device *dev)
> > +mv64xxx_i2c_remove(struct platform_device *pd)
> > {
> > - struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev);
> > + struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(pd);
> >
> > i2c_del_adapter(&drv_data->adapter);
> > free_irq(drv_data->irq, drv_data);
> > - reset_control_assert(drv_data->rstc);
> > - clk_disable_unprepare(drv_data->reg_clk);
> > - clk_disable_unprepare(drv_data->clk);
> > + pm_runtime_disable(&pd->dev);
> > + if (!pm_runtime_status_suspended(&pd->dev))
> > + mv64xxx_i2c_runtime_suspend(&pd->dev);
> >
> > return 0;
> > }
> >
> > -#ifdef CONFIG_PM
> > -static int mv64xxx_i2c_resume(struct device *dev)
> > +static void
> > +mv64xxx_i2c_shutdown(struct platform_device *pd)
> > {
> > - struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
> > -
> > - mv64xxx_i2c_hw_init(drv_data);
> > -
> > - return 0;
> > + pm_runtime_disable(&pd->dev);
> > + if (!pm_runtime_status_suspended(&pd->dev))
> > + mv64xxx_i2c_runtime_suspend(&pd->dev);
> > }
> >
> > -static const struct dev_pm_ops mv64xxx_i2c_pm = {
> > - .resume = mv64xxx_i2c_resume,
> > +static const struct dev_pm_ops mv64xxx_i2c_pm_ops = {
> > + SET_RUNTIME_PM_OPS(mv64xxx_i2c_runtime_suspend,
> > + mv64xxx_i2c_runtime_resume, NULL)
> > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> > + pm_runtime_force_resume)
> > };
> >
> > -#define mv64xxx_i2c_pm_ops (&mv64xxx_i2c_pm)
> > -#else
> > -#define mv64xxx_i2c_pm_ops NULL
> > -#endif
> > -
> > static struct platform_driver mv64xxx_i2c_driver = {
> > .probe = mv64xxx_i2c_probe,
> > .remove = mv64xxx_i2c_remove,
> > + .shutdown = mv64xxx_i2c_shutdown,
> > .driver = {
> > .name = MV64XXX_I2C_CTLR_NAME,
> > - .pm = mv64xxx_i2c_pm_ops,
> > + .pm = &mv64xxx_i2c_pm_ops,
> > .of_match_table = mv64xxx_i2c_of_match_table,
> > },
> > };
> > --
> > 2.26.2
> >

Next message: Chuck Lever: "Re: [PATCH][next] nfsd: fix check of statid returned from call to find_stateid_by_type"
Previous message: Josh Poimboeuf: "Re: linux-5.10.11 build failure"
In reply to: Wolfram Sang: "Re: [PATCH] i2c: mv64xxx: Add runtime PM support"
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