From 8e3e916e23f5ab0ceb046d57f4d41d53159b8192 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 5 Jul 2023 23:30:05 +0200 Subject: media: ipu-bridge: Add a runtime-pm device-link between VCM and sensor In most cases when a VCM is used there is a single integrated module with the sensor + VCM + lens. This means that the sensor and VCM often share regulators and possibly also something like a powerdown pin. In the ACPI tables this is modelled as a single ACPI device with multiple I2cSerialBus resources. On atomisp devices the regulators and clks are modelled as ACPI power-resources, which are controlled by the (ACPI) power state of the sensor. So the sensor must be in D0 power state for the VCM to work. To make this work add a device-link with DL_FLAG_PM_RUNTIME flag so that the sensor will automatically be runtime-resumed whenever the VCM is runtime-resumed. This requires the probing of the VCM and thus the creation of the VCM I2C-client to be delayed till after the sensor driver has bound. Move the instantiation of the VCM I2C-client to the v4l2_async_notifier bound op, so that it is done after the sensor driver has bound; and add code to add the device-link. This fixes the problem with the shared ACPI power-resources on atomisp2 and this avoids the need for VCM related workarounds on IPU3 / IPU6. E.g. until now the dw9719 driver needed to get and control a Vsio (V sensor IO) regulator since that needs to be enabled to enable I2C pass-through on the PMIC on the sensor module. So the driver was controlling this regulator even though the actual dw9719 chip has no Vsio pin / power-plane. This also removes the need for ipu_bridge_init() to return -EPROBE_DEFER since the VCM is now instantiated later. Reviewed-by: Andy Shevchenko Reviewed-by: Daniel Scally Tested-by: Daniel Scally Signed-off-by: Hans de Goede Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- include/media/ipu-bridge.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'include/media') diff --git a/include/media/ipu-bridge.h b/include/media/ipu-bridge.h index 7d84b22b2111..ceda2a801948 100644 --- a/include/media/ipu-bridge.h +++ b/include/media/ipu-bridge.h @@ -7,8 +7,6 @@ #include #include -struct i2c_client; - #define IPU_HID "INT343E" #define IPU_MAX_LANES 4 #define IPU_MAX_PORTS 4 @@ -117,7 +115,6 @@ struct ipu_sensor { /* append ssdb.link(u8) in "-%u" format as suffix of HID */ char name[ACPI_ID_LEN + 4]; struct acpi_device *adev; - struct i2c_client *vcm_i2c_client; /* SWNODE_COUNT + 1 for terminating NULL */ const struct software_node *group[SWNODE_COUNT + 1]; @@ -157,9 +154,11 @@ struct ipu_bridge { int ipu_bridge_init(struct device *dev, ipu_parse_sensor_fwnode_t parse_sensor_fwnode); int ipu_bridge_parse_ssdb(struct acpi_device *adev, struct ipu_sensor *sensor); +int ipu_bridge_instantiate_vcm(struct device *sensor); #else /* Use a define to avoid the @parse_sensor_fwnode argument getting evaluated */ #define ipu_bridge_init(dev, parse_sensor_fwnode) (0) +static inline int ipu_bridge_instantiate_vcm(struct device *s) { return 0; } #endif #endif -- cgit v1.2.3-58-ga151