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Subject[PATCH v2 5/6] media: ov5675: Support device probe in non-zero ACPI D state
Date
Tell ACPI device PM code that the driver supports the device being in
non-zero ACPI D state when the driver's probe function is entered.

Also do identification on the first access of the device, whether in probe
or when starting streaming.

Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
---
drivers/media/i2c/ov5675.c | 71 ++++++++++++++++++++++++++++++----------------
1 file changed, 46 insertions(+), 25 deletions(-)

diff --git a/drivers/media/i2c/ov5675.c b/drivers/media/i2c/ov5675.c
index da5850b7ad07..00925850fa7c 100644
--- a/drivers/media/i2c/ov5675.c
+++ b/drivers/media/i2c/ov5675.c
@@ -493,6 +493,9 @@ struct ov5675 {

/* Streaming on/off */
bool streaming;
+
+ /* True if the device has been identified */
+ bool identified;
};

static u64 to_pixel_rate(u32 f_index)
@@ -808,12 +811,41 @@ static void ov5675_update_pad_format(const struct ov5675_mode *mode,
fmt->field = V4L2_FIELD_NONE;
}

+static int ov5675_identify_module(struct ov5675 *ov5675)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
+ int ret;
+ u32 val;
+
+ if (ov5675->identified)
+ return 0;
+
+ ret = ov5675_read_reg(ov5675, OV5675_REG_CHIP_ID,
+ OV5675_REG_VALUE_24BIT, &val);
+ if (ret)
+ return ret;
+
+ if (val != OV5675_CHIP_ID) {
+ dev_err(&client->dev, "chip id mismatch: %x!=%x",
+ OV5675_CHIP_ID, val);
+ return -ENXIO;
+ }
+
+ ov5675->identified = true;
+
+ return 0;
+}
+
static int ov5675_start_streaming(struct ov5675 *ov5675)
{
struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
const struct ov5675_reg_list *reg_list;
int link_freq_index, ret;

+ ret = ov5675_identify_module(ov5675);
+ if (ret)
+ return ret;
+
link_freq_index = ov5675->cur_mode->link_freq_index;
reg_list = &link_freq_configs[link_freq_index].reg_list;
ret = ov5675_write_reg_list(ov5675, reg_list);
@@ -1048,26 +1080,6 @@ static const struct v4l2_subdev_internal_ops ov5675_internal_ops = {
.open = ov5675_open,
};

-static int ov5675_identify_module(struct ov5675 *ov5675)
-{
- struct i2c_client *client = v4l2_get_subdevdata(&ov5675->sd);
- int ret;
- u32 val;
-
- ret = ov5675_read_reg(ov5675, OV5675_REG_CHIP_ID,
- OV5675_REG_VALUE_24BIT, &val);
- if (ret)
- return ret;
-
- if (val != OV5675_CHIP_ID) {
- dev_err(&client->dev, "chip id mismatch: %x!=%x",
- OV5675_CHIP_ID, val);
- return -ENXIO;
- }
-
- return 0;
-}
-
static int ov5675_check_hwcfg(struct device *dev)
{
struct fwnode_handle *ep;
@@ -1154,6 +1166,7 @@ static int ov5675_remove(struct i2c_client *client)
static int ov5675_probe(struct i2c_client *client)
{
struct ov5675 *ov5675;
+ bool full_power;
int ret;

ret = ov5675_check_hwcfg(&client->dev);
@@ -1168,10 +1181,14 @@ static int ov5675_probe(struct i2c_client *client)
return -ENOMEM;

v4l2_i2c_subdev_init(&ov5675->sd, client, &ov5675_subdev_ops);
- ret = ov5675_identify_module(ov5675);
- if (ret) {
- dev_err(&client->dev, "failed to find sensor: %d", ret);
- return ret;
+
+ full_power = acpi_dev_state_d0(&client->dev);
+ if (full_power) {
+ ret = ov5675_identify_module(ov5675);
+ if (ret) {
+ dev_err(&client->dev, "failed to find sensor: %d", ret);
+ return ret;
+ }
}

mutex_init(&ov5675->mutex);
@@ -1204,7 +1221,10 @@ static int ov5675_probe(struct i2c_client *client)
* Device is already turned on by i2c-core with ACPI domain PM.
* Enable runtime PM and turn off the device.
*/
- pm_runtime_set_active(&client->dev);
+
+ /* Set the device's state to active if it's in D0 state. */
+ if (full_power)
+ pm_runtime_set_active(&client->dev);
pm_runtime_enable(&client->dev);
pm_runtime_idle(&client->dev);

@@ -1241,6 +1261,7 @@ static struct i2c_driver ov5675_i2c_driver = {
},
.probe_new = ov5675_probe,
.remove = ov5675_remove,
+ .flags = I2C_DRV_ACPI_WAIVE_D0_PROBE,
};

module_i2c_driver(ov5675_i2c_driver);
--
2.7.4
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