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Message-Id: <20211018121729.6357-6-sakari.ailus@linux.intel.com>
Date: Mon, 18 Oct 2021 15:17:28 +0300
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: linux-i2c@...r.kernel.org
Cc: Wolfram Sang <wsa@...-dreams.de>,
"Rafael J. Wysocki" <rafael@...nel.org>,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
rajmohan.mani@...el.com, Tomasz Figa <tfiga@...omium.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Bingbu Cao <bingbu.cao@...el.com>,
Chiranjeevi Rapolu <chiranjeevi.rapolu@...el.com>,
Hyungwoo Yang <hyungwoo.yang@...el.com>,
linux-media@...r.kernel.org
Subject: [PATCH 5/6] media: i2c: imx319: Support device probe in non-zero ACPI D state
From: Rajmohan Mani <rajmohan.mani@...el.com>
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.
Signed-off-by: Rajmohan Mani <rajmohan.mani@...el.com>
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Reviewed-by: Tomasz Figa <tfiga@...omium.org>
Reviewed-by: Bingbu Cao <bingbu.cao@...el.com>
---
drivers/media/i2c/imx319.c | 74 ++++++++++++++++++++++----------------
1 file changed, 44 insertions(+), 30 deletions(-)
diff --git a/drivers/media/i2c/imx319.c b/drivers/media/i2c/imx319.c
index dba0854ab5aad..daa976858e296 100644
--- a/drivers/media/i2c/imx319.c
+++ b/drivers/media/i2c/imx319.c
@@ -140,6 +140,8 @@ struct imx319 {
/* Streaming on/off */
bool streaming;
+ /* True if the device has been identified */
+ bool identified;
};
static const struct imx319_reg imx319_global_regs[] = {
@@ -2084,6 +2086,31 @@ imx319_set_pad_format(struct v4l2_subdev *sd,
return 0;
}
+/* Verify chip ID */
+static int imx319_identify_module(struct imx319 *imx319)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&imx319->sd);
+ int ret;
+ u32 val;
+
+ if (imx319->identified)
+ return 0;
+
+ ret = imx319_read_reg(imx319, IMX319_REG_CHIP_ID, 2, &val);
+ if (ret)
+ return ret;
+
+ if (val != IMX319_CHIP_ID) {
+ dev_err(&client->dev, "chip id mismatch: %x!=%x",
+ IMX319_CHIP_ID, val);
+ return -EIO;
+ }
+
+ imx319->identified = true;
+
+ return 0;
+}
+
/* Start streaming */
static int imx319_start_streaming(struct imx319 *imx319)
{
@@ -2091,6 +2118,10 @@ static int imx319_start_streaming(struct imx319 *imx319)
const struct imx319_reg_list *reg_list;
int ret;
+ ret = imx319_identify_module(imx319);
+ if (ret)
+ return ret;
+
/* Global Setting */
reg_list = &imx319_global_setting;
ret = imx319_write_regs(imx319, reg_list->regs, reg_list->num_of_regs);
@@ -2206,26 +2237,6 @@ static int __maybe_unused imx319_resume(struct device *dev)
return ret;
}
-/* Verify chip ID */
-static int imx319_identify_module(struct imx319 *imx319)
-{
- struct i2c_client *client = v4l2_get_subdevdata(&imx319->sd);
- int ret;
- u32 val;
-
- ret = imx319_read_reg(imx319, IMX319_REG_CHIP_ID, 2, &val);
- if (ret)
- return ret;
-
- if (val != IMX319_CHIP_ID) {
- dev_err(&client->dev, "chip id mismatch: %x!=%x",
- IMX319_CHIP_ID, val);
- return -EIO;
- }
-
- return 0;
-}
-
static const struct v4l2_subdev_core_ops imx319_subdev_core_ops = {
.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
.unsubscribe_event = v4l2_event_subdev_unsubscribe,
@@ -2420,6 +2431,7 @@ static struct imx319_hwcfg *imx319_get_hwcfg(struct device *dev)
static int imx319_probe(struct i2c_client *client)
{
struct imx319 *imx319;
+ bool full_power;
int ret;
u32 i;
@@ -2432,11 +2444,14 @@ static int imx319_probe(struct i2c_client *client)
/* Initialize subdev */
v4l2_i2c_subdev_init(&imx319->sd, client, &imx319_subdev_ops);
- /* Check module identity */
- ret = imx319_identify_module(imx319);
- if (ret) {
- dev_err(&client->dev, "failed to find sensor: %d", ret);
- goto error_probe;
+ full_power = acpi_dev_state_d0(&client->dev);
+ if (full_power) {
+ /* Check module identity */
+ ret = imx319_identify_module(imx319);
+ if (ret) {
+ dev_err(&client->dev, "failed to find sensor: %d", ret);
+ goto error_probe;
+ }
}
imx319->hwcfg = imx319_get_hwcfg(&client->dev);
@@ -2488,11 +2503,9 @@ static int imx319_probe(struct i2c_client *client)
if (ret < 0)
goto error_media_entity;
- /*
- * 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);
@@ -2545,6 +2558,7 @@ static struct i2c_driver imx319_i2c_driver = {
},
.probe_new = imx319_probe,
.remove = imx319_remove,
+ .flags = I2C_DRV_ACPI_WAIVE_D0_PROBE,
};
module_i2c_driver(imx319_i2c_driver);
--
2.30.2
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