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

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Date:   Thu, 20 Jan 2022 11:57:24 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     broonie@...nel.org, 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

On Thu, Jan 20, 2022 at 09:04:17AM +0100, Martin Kepplinger wrote:
> 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?

Oops! I wrote a reply but forgot to send it. I've just sent that.

-- 
Sakari Ailus