linux-kernel - Re: [PATCH v3] media: i2c: dw9714: add optional regulator support

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Message-ID: <98d12c1acaf77772f51361b079dde7e982a6dafd.camel@puri.sm>
Date:   Thu, 20 Jan 2022 09:04:17 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     broonie@...nel.org, sakari.ailus@...ux.intel.com
Cc:     angus@...ea.ca, kernel@...i.sm, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-pm@...r.kernel.org,
        mchehab@...nel.org
Subject: Re: [PATCH v3] media: i2c: dw9714: add optional regulator support

Am Dienstag, dem 21.12.2021 um 18:33 +0100 schrieb Martin Kepplinger:
> Am Montag, dem 29.11.2021 um 13:07 +0100 schrieb Martin Kepplinger:
> > From: Angus Ainslie <angus@...ea.ca>
> > 
> > Allow the dw9714 to control a regulator and adjust suspend() and
> > resume()
> > to support both runtime and system pm.
> > 
> > Signed-off-by: Angus Ainslie <angus@...ea.ca>
> > Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
> > ---
> > 
> > 
> > revision history
> > ----------------
> > v3: (thank you Mark and Sakari)
> >  * use regulator_get() instead of regulator_get_optional()
> > 
> > v2: (thank you Mark)
> >  * simplify the regulator_get_optional() error path
> >  * fix regulator usage during probe()
> > https://lore.kernel.org/linux-media/20211126090107.1243558-1-martin.kepplinger@puri.sm/
> > 
> > v1:
> > https://lore.kernel.org/linux-media/20211125080922.978583-1-martin.kepplinger@puri.sm/
> > 
> > 
> > 
> >  drivers/media/i2c/dw9714.c | 32 +++++++++++++++++++++++++++++++-
> >  1 file changed, 31 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/media/i2c/dw9714.c
> > b/drivers/media/i2c/dw9714.c
> > index 3863dfeb8293..81170bbe0e55 100644
> > --- a/drivers/media/i2c/dw9714.c
> > +++ b/drivers/media/i2c/dw9714.c
> > @@ -5,6 +5,7 @@
> >  #include <linux/i2c.h>
> >  #include <linux/module.h>
> >  #include <linux/pm_runtime.h>
> > +#include <linux/regulator/consumer.h>
> >  #include <media/v4l2-ctrls.h>
> >  #include <media/v4l2-device.h>
> >  #include <media/v4l2-event.h>
> > @@ -36,6 +37,7 @@ struct dw9714_device {
> >         struct v4l2_ctrl_handler ctrls_vcm;
> >         struct v4l2_subdev sd;
> >         u16 current_val;
> > +       struct regulator *vcc;
> >  };
> >  
> >  static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl
> > *ctrl)
> > @@ -145,6 +147,16 @@ static int dw9714_probe(struct i2c_client
> > *client)
> >         if (dw9714_dev == NULL)
> >                 return -ENOMEM;
> >  
> > +       dw9714_dev->vcc = devm_regulator_get(&client->dev, "vcc");
> > +       if (IS_ERR(dw9714_dev->vcc))
> > +               return PTR_ERR(dw9714_dev->vcc);
> > +
> > +       rval = regulator_enable(dw9714_dev->vcc);
> > +       if (rval < 0) {
> > +               dev_err(&client->dev, "failed to enable vcc: %d\n",
> > rval);
> > +               return rval;
> > +       }
> > +
> >         v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops);
> >         dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
> >                                 V4L2_SUBDEV_FL_HAS_EVENTS;
> > @@ -200,6 +212,9 @@ static int __maybe_unused
> > dw9714_vcm_suspend(struct device *dev)
> >         struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
> >         int ret, val;
> >  
> > +       if (pm_runtime_suspended(&client->dev))
> > +               return 0;
> > +
> >         for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS -
> > 1);
> >              val >= 0; val -= DW9714_CTRL_STEPS) {
> >                 ret = dw9714_i2c_write(client,
> > @@ -208,7 +223,12 @@ static int __maybe_unused
> > dw9714_vcm_suspend(struct device *dev)
> >                         dev_err_once(dev, "%s I2C failure: %d",
> > __func__, ret);
> >                 usleep_range(DW9714_CTRL_DELAY_US,
> > DW9714_CTRL_DELAY_US + 10);
> >         }
> > -       return 0;
> > +
> > +       ret = regulator_disable(dw9714_dev->vcc);
> > +       if (ret)
> > +               dev_err(dev, "Failed to disable vcc: %d\n", ret);
> > +
> > +       return ret;
> >  }
> >  
> >  /*
> > @@ -224,6 +244,16 @@ static int  __maybe_unused
> > dw9714_vcm_resume(struct device *dev)
> >         struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
> >         int ret, val;
> >  
> > +       if (pm_runtime_suspended(&client->dev))
> > +               return 0;
> > +
> > +       ret = regulator_enable(dw9714_dev->vcc);
> > +       if (ret) {
> > +               dev_err(dev, "Failed to enable vcc: %d\n", ret);
> > +               return ret;
> > +       }
> > +       usleep_range(1000, 2000);
> > +
> >         for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS;
> >              val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1;
> >              val += DW9714_CTRL_STEPS) {
> 
> hi Sakari and all interested,
> 
> any objection to this addition? I run it for a long time now.
> 
> thank you,
> 
>                               martin
> 
> 

hi all, patchwork marked this as "changes requested":
https://patchwork.linuxtv.org/project/linux-media/patch/20211129120754.1766570-1-martin.kepplinger@puri.sm/

I'm not aware of changes you wish to this. What do you think?

thank you,

                           martin