On some ACPI platforms, such as Chromebooks the ACPI methods to
change the power-state (_PS0 and _PS3) fully take care of powering
on/off the sensor.
On other ACPI platforms, such as e.g. various HP models with IPU6 +
hi556 sensor, the sensor driver must control the sensor's clock itself.
Add support for having the driver control an optional clock.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/media/i2c/hi556.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/media/i2c/hi556.c b/drivers/media/i2c/hi556.c
index e084f7888e29..235caadf02dc 100644
--- a/drivers/media/i2c/hi556.c
+++ b/drivers/media/i2c/hi556.c
@@ -3,6 +3,7 @@
#include <asm/unaligned.h>
#include <linux/acpi.h>
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
@@ -636,6 +637,7 @@ struct hi556 {
/* GPIOs, clocks, etc. */
struct gpio_desc *reset_gpio;
+ struct clk *clk;
/* Current mode */
const struct hi556_mode *cur_mode;
@@ -1286,6 +1288,7 @@ static int hi556_suspend(struct device *dev)
struct hi556 *hi556 = to_hi556(sd);
gpiod_set_value_cansleep(hi556->reset_gpio, 1);
+ clk_disable_unprepare(hi556->clk);
return 0;
}
@@ -1293,6 +1296,11 @@ static int hi556_resume(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct hi556 *hi556 = to_hi556(sd);
+ int ret;
+
+ ret = clk_prepare_enable(hi556->clk);
+ if (ret)
+ return ret;
gpiod_set_value_cansleep(hi556->reset_gpio, 0);
usleep_range(5000, 5500);
@@ -1324,6 +1332,11 @@ static int hi556_probe(struct i2c_client *client)
return dev_err_probe(&client->dev, PTR_ERR(hi556->reset_gpio),
"failed to get reset GPIO\n");
+ hi556->clk = devm_clk_get_optional(&client->dev, "clk");
+ if (IS_ERR(hi556->clk))
+ return dev_err_probe(&client->dev, PTR_ERR(hi556->clk),
+ "failed to get clock\n");
+
full_power = acpi_dev_state_d0(&client->dev);
if (full_power) {
/* Ensure non ACPI managed resources are enabled */
--
2.44.0
