Hi Sakari,
and thanks for the review!
On 2024-02-23 at 08:19 GMT, Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> wrote:
> Hi Mikhail,
>
> On Mon, Jan 08, 2024 at 06:06:52PM +0300, Mikhail Rudenko wrote:
>> Hi Sakari,
>>
>> Thanks for the review!
>>
>> On 2024-01-08 at 11:18 GMT, Sakari Ailus <sakari.ailus@xxxxxx> wrote:
>>
>> > Hi Mikhail,
>> >
>> > On Mon, Dec 18, 2023 at 08:40:30PM +0300, Mikhail Rudenko wrote:
>> >> Use runtime PM autosuspend to avoid powering off the sensor during
>> >> fast stop-reconfigure-restart cycles.
>> >>
>> >> Signed-off-by: Mikhail Rudenko <mike.rudenko@xxxxxxxxx>
>> >> ---
>> >> drivers/media/i2c/ov4689.c | 22 +++++++++++++++-------
>> >> 1 file changed, 15 insertions(+), 7 deletions(-)
>> >>
>> >> diff --git a/drivers/media/i2c/ov4689.c b/drivers/media/i2c/ov4689.c
>> >> index 5300e621ff90..64cc6d9e48cc 100644
>> >> --- a/drivers/media/i2c/ov4689.c
>> >> +++ b/drivers/media/i2c/ov4689.c
>> >> @@ -407,26 +407,27 @@ static int ov4689_s_stream(struct v4l2_subdev *sd, int on)
>> >> ov4689->cur_mode->num_regs,
>> >> NULL);
>> >> if (ret) {
>> >> - pm_runtime_put(dev);
>> >> + pm_runtime_put_sync(dev);
>> >
>> > Why are you switching to pm_runtime_put_sync() here? That isn't covered by
>> > the commit message (nor I think should be done).
>>
>> PM autosuspend conversion was suggested earlier by Laurent in his review
>> of this series [1], and he adviced looking at how it was done for the
>> imx290 driver. I followed along the lines of the corresponding patch
>> [2].
>
> There's no need to use the _sync() variant here. And at least it wouldn't
> be related to autosuspend, were you to switch to that.
Ok, will use pm_runtime_put in v3. Or do you suggest dropping this patch
altogether? Laurent?
>>
>> >> goto unlock_and_return;
>> >> }
>> >>
>> >> ret = __v4l2_ctrl_handler_setup(&ov4689->ctrl_handler);
>> >> if (ret) {
>> >> - pm_runtime_put(dev);
>> >> + pm_runtime_put_sync(dev);
>> >> goto unlock_and_return;
>> >> }
>> >>
>> >> ret = cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
>> >> OV4689_MODE_STREAMING, NULL);
>> >> if (ret) {
>> >> - pm_runtime_put(dev);
>> >> + pm_runtime_put_sync(dev);
>> >> goto unlock_and_return;
>> >> }
>> >> } else {
>> >> cci_write(ov4689->regmap, OV4689_REG_CTRL_MODE,
>> >> OV4689_MODE_SW_STANDBY, NULL);
>> >> - pm_runtime_put(dev);
>> >> + pm_runtime_mark_last_busy(dev);
>> >> + pm_runtime_put_autosuspend(dev);
>> >> }
>> >>
>> >> unlock_and_return:
>> >> @@ -606,7 +607,9 @@ static int ov4689_set_ctrl(struct v4l2_ctrl *ctrl)
>> >> break;
>> >> }
>> >>
>> >> - pm_runtime_put(dev);
>> >> + pm_runtime_mark_last_busy(dev);
>> >> + pm_runtime_put_autosuspend(dev);
>> >
>> > Also note that with runtime PM autosuspend, you have to use
>> > pm_runtime_get_if_active() instead of pm_runtime_get_if_in_use().
>>
>> Noted, will do so in v3.
>>
>> >> +
>> >> return ret;
>> >> }
>> >>
>> >> @@ -877,8 +880,10 @@ static int ov4689_probe(struct i2c_client *client)
>> >> }
>> >>
>> >> pm_runtime_set_active(dev);
>> >> + pm_runtime_get_noresume(dev);
>> >> pm_runtime_enable(dev);
>> >> - pm_runtime_idle(dev);
>> >> + pm_runtime_set_autosuspend_delay(dev, 1000);
>> >> + pm_runtime_use_autosuspend(dev);
>> >>
>> >> ret = v4l2_async_register_subdev_sensor(sd);
>> >> if (ret) {
>> >> @@ -886,11 +891,14 @@ static int ov4689_probe(struct i2c_client *client)
>> >> goto err_clean_subdev_pm;
>> >> }
>> >>
>> >> + pm_runtime_mark_last_busy(dev);
>> >> + pm_runtime_put_autosuspend(dev);
>> >> +
>> >> return 0;
>> >>
>> >> err_clean_subdev_pm:
>> >> pm_runtime_disable(dev);
>> >> - pm_runtime_set_suspended(dev);
>> >> + pm_runtime_put_noidle(dev);
>> >> v4l2_subdev_cleanup(sd);
>> >> err_clean_entity:
>> >> media_entity_cleanup(&sd->entity);
>>
>> [1] https://lore.kernel.org/all/20231211181935.GG27535@xxxxxxxxxxxxxxxxxxxxxxxxxx/
>> [2] https://lore.kernel.org/all/20230116144454.1012-14-laurent.pinchart@xxxxxxxxxxxxxxxx/
>>
--
Best regards,
Mikhail Rudenko
