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media: ov7670: hook s_power onto v4l2 core

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The commit 71862f63f3 ("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 <lkundrak@v3.sk>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Lubomir Rintel 2019-01-15 06:54:45 -02:00 committed by Mauro Carvalho Chehab
parent 40012cd5ec
commit 3d6a8fe256
1 changed files with 44 additions and 6 deletions
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50
drivers/media/i2c/ov7670.c
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@ -243,6 +243,7 @@ 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 */
@ -1617,19 +1618,54 @@ 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;
}
@ -1662,6 +1698,7 @@ 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,
.log_status = v4l2_ctrl_subdev_log_status,
.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
.unsubscribe_event = v4l2_event_subdev_unsubscribe,
@ -1826,6 +1863,7 @@ static int ov7670_probe(struct i2c_client *client,
else
return ret;
}
if (info->clk) {
ret = clk_prepare_enable(info->clk);
if (ret)
@ -1842,7 +1880,7 @@ 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);
@ -1930,7 +1968,7 @@ 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;
@ -1946,7 +1984,7 @@ 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;
}