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media: ipu3-cio2: Defer probing until the PMIC is fully setup

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On devices where things are not fully describe in devicetree (1)
and where the code thus falls back to calling cio2_bridge_init(),
the i2c-clients for any VCMs also need to be instantiated manually.

The VCM can be probed by its driver as soon as the code instantiates
the i2c-client and this probing must not happen before the PMIC is
fully setup.

Make cio2_bridge_init() return -EPROBE_DEFER when the PMIC is not
fully-setup, deferring the probe of the ipu3-cio2 driver.

This is a preparation patch for adding VCM enumeration support to
the ipu3-cio2-bridge code.

1) Through embedding of devicetree info in the ACPI tables

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans de Goede 2021-12-03 11:28:55 +01:00 committed by Mauro Carvalho Chehab
parent 86790a4fdf
commit ae971ccae9
1 changed files with 37 additions and 0 deletions
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37
drivers/media/pci/intel/ipu3/cio2-bridge.c
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@ -308,6 +308,40 @@ err_unregister_sensors:
return ret;
}
/*
* The VCM cannot be probed until the PMIC is completely setup. We cannot rely
* on -EPROBE_DEFER for this, since the consumer<->supplier relations between
* the VCM and regulators/clks are not described in ACPI, instead they are
* passed as board-data to the PMIC drivers. Since -PROBE_DEFER does not work
* for the clks/regulators the VCM i2c-clients must not be instantiated until
* the PMIC is fully setup.
*
* The sensor/VCM ACPI device has an ACPI _DEP on the PMIC, check this using the
* acpi_dev_ready_for_enumeration() helper, like the i2c-core-acpi code does
* for the sensors.
*/
static int cio2_bridge_sensors_are_ready(void)
{
struct acpi_device *adev;
bool ready = true;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(cio2_supported_sensors); i++) {
const struct cio2_sensor_config *cfg =
&cio2_supported_sensors[i];
for_each_acpi_dev_match(adev, cfg->hid, NULL, -1) {
if (!adev->status.enabled)
continue;
if (!acpi_dev_ready_for_enumeration(adev))
ready = false;
}
}
return ready;
}
int cio2_bridge_init(struct pci_dev *cio2)
{
struct device *dev = &cio2->dev;
@ -316,6 +350,9 @@ int cio2_bridge_init(struct pci_dev *cio2)
unsigned int i;
int ret;
if (!cio2_bridge_sensors_are_ready())
return -EPROBE_DEFER;
bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
if (!bridge)
return -ENOMEM;