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More ACPI updates for 5.16-rc1

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- Add support for new ACPI device configuration object called _DSC
    to allow certain devices to be probed without changing their power
    states, document it and make two drivers use it (Sakari Ailus,
    Rajmohan Mani).
 
  - Fix device wakeup power reference counting broken recently by
    mistake (Rafael Wysocki).
 
  - Drop unused symbol and macros depending on it from acgcc.h (Rafael
    Wysocki).
 
  - Add HP ZHAN 66 Pro to the "no EC wakeup" quirk list (Binbin Zhou).
 
  - Add Xiaomi Mi Pad 2 to the backlight quirk list and drop an unused
    piece of data from all of the list entries (Hans de Goede).
 
  - Fix register read accesses handling in the Intel PMIC operation
    region driver (Hans de Goede).
 
  - Clean up static variables initialization in the EC driver
    (wangzhitong).
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Merge tag 'acpi-5.16-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more ACPI updates from Rafael Wysocki:
 "These add support for a new ACPI device configuration object called
  _DSC, fix some issues including one recent regression, add two new
  items to quirk lists and clean up assorted pieces of code.

  Specifics:

   - Add support for new ACPI device configuration object called _DSC
     ("Deepest State for Configuration") to allow certain devices to be
     probed without changing their power states, document it and make
     two drivers use it (Sakari Ailus, Rajmohan Mani).

   - Fix device wakeup power reference counting broken recently by
     mistake (Rafael Wysocki).

   - Drop unused symbol and macros depending on it from acgcc.h (Rafael
     Wysocki).

   - Add HP ZHAN 66 Pro to the "no EC wakeup" quirk list (Binbin Zhou).

   - Add Xiaomi Mi Pad 2 to the backlight quirk list and drop an unused
     piece of data from all of the list entries (Hans de Goede).

   - Fix register read accesses handling in the Intel PMIC operation
     region driver (Hans de Goede).

   - Clean up static variables initialization in the EC driver
     (wangzhitong)"

* tag 'acpi-5.16-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Documentation: ACPI: Fix non-D0 probe _DSC object example
  ACPI: Drop ACPI_USE_BUILTIN_STDARG ifdef from acgcc.h
  ACPI: PM: Fix device wakeup power reference counting error
  ACPI: video: use platform backlight driver on Xiaomi Mi Pad 2
  ACPI: video: Drop dmi_system_id.ident settings from video_detect_dmi_table[]
  ACPI: PMIC: Fix intel_pmic_regs_handler() read accesses
  ACPI: EC: Remove initialization of static variables to false
  ACPI: EC: Use ec_no_wakeup on HP ZHAN 66 Pro
  at24: Support probing while in non-zero ACPI D state
  media: i2c: imx319: Support device probe in non-zero ACPI D state
  ACPI: Add a convenience function to tell a device is in D0 state
  Documentation: ACPI: Document _DSC object usage for enum power state
  i2c: Allow an ACPI driver to manage the device's power state during probe
  ACPI: scan: Obtain device's desired enumeration power state
This commit is contained in:
Linus Torvalds 2021-11-10 11:52:40 -08:00
commit 285fc3db0a
16 changed files with 302 additions and 130 deletions
Download patch file Download diff file Expand all files Collapse all files

45
drivers/misc/eeprom/at24.c
View file

@ -595,6 +595,7 @@ static int at24_probe(struct i2c_client *client)
bool i2c_fn_i2c, i2c_fn_block;
unsigned int i, num_addresses;
struct at24_data *at24;
bool full_power;
struct regmap *regmap;
bool writable;
u8 test_byte;
@ -747,14 +748,16 @@ static int at24_probe(struct i2c_client *client)
i2c_set_clientdata(client, at24);
err = regulator_enable(at24->vcc_reg);
if (err) {
dev_err(dev, "Failed to enable vcc regulator\n");
return err;
}
full_power = acpi_dev_state_d0(&client->dev);
if (full_power) {
err = regulator_enable(at24->vcc_reg);
if (err) {
dev_err(dev, "Failed to enable vcc regulator\n");
return err;
}
/* enable runtime pm */
pm_runtime_set_active(dev);
pm_runtime_set_active(dev);
}
pm_runtime_enable(dev);
at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
@ -766,15 +769,18 @@ static int at24_probe(struct i2c_client *client)
}
/*
* Perform a one-byte test read to verify that the
* chip is functional.
* Perform a one-byte test read to verify that the chip is functional,
* unless powering on the device is to be avoided during probe (i.e.
* it's powered off right now).
*/
err = at24_read(at24, 0, &test_byte, 1);
if (err) {
pm_runtime_disable(dev);
if (!pm_runtime_status_suspended(dev))
regulator_disable(at24->vcc_reg);
return -ENODEV;
if (full_power) {
err = at24_read(at24, 0, &test_byte, 1);
if (err) {
pm_runtime_disable(dev);
if (!pm_runtime_status_suspended(dev))
regulator_disable(at24->vcc_reg);
return -ENODEV;
}
}
pm_runtime_idle(dev);
@ -794,9 +800,11 @@ static int at24_remove(struct i2c_client *client)
struct at24_data *at24 = i2c_get_clientdata(client);
pm_runtime_disable(&client->dev);
if (!pm_runtime_status_suspended(&client->dev))
regulator_disable(at24->vcc_reg);
pm_runtime_set_suspended(&client->dev);
if (acpi_dev_state_d0(&client->dev)) {
if (!pm_runtime_status_suspended(&client->dev))
regulator_disable(at24->vcc_reg);
pm_runtime_set_suspended(&client->dev);
}
return 0;
}
@ -833,6 +841,7 @@ static struct i2c_driver at24_driver = {
.probe_new = at24_probe,
.remove = at24_remove,
.id_table = at24_ids,
.flags = I2C_DRV_ACPI_WAIVE_D0_PROBE,
};
static int __init at24_init(void)