Hi Lubomir,
On Tue, Nov 20, 2018 at 11:03:08AM +0100, Lubomir Rintel wrote:
> The commit 71862f63f351 ("media: ov7670: Add the ov7670_s_power function")
> added a power control routing. However, it was not good enough to use as
> a s_power() callback: it merely flipped on the power GPIOs without
> restoring the register settings.
>
> Fix this now and register an actual power callback.
>
> Signed-off-by: Lubomir Rintel <lkund...@v3.sk>
>
> ---
> Changes since v2:
> - Restore the controls, format and frame rate on power on
>
> drivers/media/i2c/ov7670.c | 50 +++++++++++++++++++++++++++++++++-----
> 1 file changed, 44 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c
> index ead0c360df33..cbaab60aaaac 100644
> --- a/drivers/media/i2c/ov7670.c
> +++ b/drivers/media/i2c/ov7670.c
> @@ -242,6 +242,7 @@ struct ov7670_info {
> struct ov7670_format_struct *fmt; /* Current format */
> struct ov7670_win_size *wsize;
> struct clk *clk;
> + int on;
> struct gpio_desc *resetb_gpio;
> struct gpio_desc *pwdn_gpio;
> unsigned int mbus_config; /* Media bus configuration flags */
> @@ -1615,19 +1616,54 @@ static int ov7670_s_register(struct v4l2_subdev *sd,
> const struct v4l2_dbg_regis
> }
> #endif
>
> -static int ov7670_s_power(struct v4l2_subdev *sd, int on)
> +static void ov7670_power_on(struct v4l2_subdev *sd)
> {
> struct ov7670_info *info = to_state(sd);
>
> + if (info->on)
> + return;
> +
> if (info->pwdn_gpio)
> - gpiod_set_value(info->pwdn_gpio, !on);
> - if (on && info->resetb_gpio) {
> + gpiod_set_value(info->pwdn_gpio, 0);
> + if (info->resetb_gpio) {
> gpiod_set_value(info->resetb_gpio, 1);
> usleep_range(500, 1000);
> gpiod_set_value(info->resetb_gpio, 0);
> usleep_range(3000, 5000);
> }
>
> + info->on = true;
> +}
> +
> +static void ov7670_power_off(struct v4l2_subdev *sd)
> +{
> + struct ov7670_info *info = to_state(sd);
> +
> + if (!info->on)
> + return;
> +
> + if (info->pwdn_gpio)
> + gpiod_set_value(info->pwdn_gpio, 1);
> +
> + info->on = false;
> +}
> +
> +static int ov7670_s_power(struct v4l2_subdev *sd, int on)
> +{
> + struct ov7670_info *info = to_state(sd);
> +
> + if (info->on == on)
> + return 0;
> +
> + if (on) {
> + ov7670_power_on (sd);
> + ov7670_apply_fmt(sd);
> + ov7675_apply_framerate(sd);
> + v4l2_ctrl_handler_setup(&info->hdl);
> + } else {
> + ov7670_power_off (sd);
> + }
> +
> return 0;
> }
>
> @@ -1660,6 +1696,7 @@ static int ov7670_open(struct v4l2_subdev *sd, struct
> v4l2_subdev_fh *fh)
> static const struct v4l2_subdev_core_ops ov7670_core_ops = {
> .reset = ov7670_reset,
> .init = ov7670_init,
> + .s_power = ov7670_s_power,
> #ifdef CONFIG_VIDEO_ADV_DEBUG
> .g_register = ov7670_g_register,
> .s_register = ov7670_s_register,
> @@ -1825,6 +1862,7 @@ static int ov7670_probe(struct i2c_client *client,
> else
> return ret;
> }
> +
> if (info->clk) {
> ret = clk_prepare_enable(info->clk);
> if (ret)
> @@ -1841,7 +1879,7 @@ static int ov7670_probe(struct i2c_client *client,
> if (ret)
> goto clk_disable;
>
> - ov7670_s_power(sd, 1);
> + ov7670_power_on(sd);
>
> /* Make sure it's an ov7670 */
> ret = ov7670_detect(sd);
> @@ -1929,7 +1967,7 @@ static int ov7670_probe(struct i2c_client *client,
> hdl_free:
> v4l2_ctrl_handler_free(&info->hdl);
> power_off:
> - ov7670_s_power(sd, 0);
> + ov7670_power_off(sd);
> clk_disable:
> clk_disable_unprepare(info->clk);
> return ret;
> @@ -1945,7 +1983,7 @@ static int ov7670_remove(struct i2c_client *client)
> v4l2_ctrl_handler_free(&info->hdl);
> clk_disable_unprepare(info->clk);
> media_entity_cleanup(&info->sd.entity);
> - ov7670_s_power(sd, 0);
> + ov7670_power_off(sd);
> return 0;
> }
>
Could you consider instead switching to runtime PM? A few drivers such as
the ov2685 driver does that already.
--
Kind regards,
Sakari Ailus
e-mail: sakari.ai...@iki.fi
