diff options
| author | Varshit B Pandya <varshit.b.pandya@intel.com> | 2021-10-27 10:41:32 +0530 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-11-19 14:53:06 +0000 |
| commit | 04e8c2b5ff85e246d6f711f58cc54b0e2ba91841 (patch) | |
| tree | 0dc471ac6b2873aadb8b0dd0e34b12c5b69944cb /src/drivers/intel/mipi_camera | |
| parent | 423e9e0fc0c6c20df32683be816368cb68374c05 (diff) | |
driver/intel/mipi_camera: Add support for _DSC field
The _DSC (Device State for Configuration) object evaluates to an integer
may be used to tell Linux the highest allowed D state for a device
during probe. The support for _DSC requires support from the kernel
bus type if the bus driver normally sets the device in D0 state for
probe.
The D states and thus also the allowed values for _DSC are listed below.
Number State Description
0 D0 Device fully powered on
1 D1
2 D2
3 D3hot
4 D3cold Off
More details can be found here https://lkml.org/lkml/2021/10/25/397
BUG=none
BRANCH=none
TEST=Add corresponding field in brya, boot and dump SSDT to check if
_DSC field is as per expectation.
Name (_ADR, Zero) // _ADR: Address
Name (_HID, "OVTI8856") // _HID: Hardware ID
Name (_UID, Zero) // _UID: Unique ID
Name (_DDN, "Ov 8856 Camera") // _DDN: DOS Device Name
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (0x0F)
}
Method (_DSC, 0, NotSerialized)
{
Return (0x04)
}
Signed-off-by: Varshit B Pandya <varshit.b.pandya@intel.com>
Change-Id: I5471f144918413a2982f86beaf3dbf7e4e66cc9b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58767
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Diffstat (limited to 'src/drivers/intel/mipi_camera')
| -rw-r--r-- | src/drivers/intel/mipi_camera/camera.c | 3 | ||||
| -rw-r--r-- | src/drivers/intel/mipi_camera/chip.h | 11 |
2 files changed, 14 insertions, 0 deletions
diff --git a/src/drivers/intel/mipi_camera/camera.c b/src/drivers/intel/mipi_camera/camera.c index ec79e39a60..a9af25cf12 100644 --- a/src/drivers/intel/mipi_camera/camera.c +++ b/src/drivers/intel/mipi_camera/camera.c @@ -847,6 +847,9 @@ static void write_i2c_camera_device(const struct device *dev, const char *scope) acpigen_write_name_integer("_UID", config->acpi_uid); acpigen_write_name_string("_DDN", config->chip_name); acpigen_write_STA(acpi_device_status(dev)); + acpigen_write_method("_DSC", 0); + acpigen_write_return_integer(config->max_dstate_for_probe); + acpigen_pop_len(); /* Method _DSC */ /* Resources */ acpigen_write_name("_CRS"); diff --git a/src/drivers/intel/mipi_camera/chip.h b/src/drivers/intel/mipi_camera/chip.h index c6ead1ffd6..55e9f33fb1 100644 --- a/src/drivers/intel/mipi_camera/chip.h +++ b/src/drivers/intel/mipi_camera/chip.h @@ -257,6 +257,17 @@ struct drivers_intel_mipi_camera_config { bool has_power_resource; /* Perform low power probe */ bool low_power_probe; + /* + * This will create a _DSC method in ACPI which returns an integer, to tell the kernel + * the highest allowed D state for a device during probe + * Number State Description + * 0 D0 Device fully powered on + * 1 D1 + * 2 D2 + * 3 D3hot + * 4 D3cold Off + */ + uint8_t max_dstate_for_probe; }; #endif |