diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2025-04-17 13:13:34 +0200 |
|---|---|---|
| committer | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2025-04-24 16:05:37 +0300 |
| commit | ccda394e1ef17c3de33e31e7a4d2e647be6a362d (patch) | |
| tree | 25e1d6423ec8f7f32435ed750eb48f360d559a90 | |
| parent | 033234bdc6cfb88a797a16aa3a9df815bbe01a28 (diff) | |
platform/x86: int3472: Avoid GPIO regulator spikes
Avoid the GPIO controlling the avdd regulator being driven low or high
for a very short time leading to spikes by adding an enable delay of 2 ms
and a minimum off to on delay of also 2 ms.
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: David Heidelberg <david@ixit.cz> # Dell Latitude 9440
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://lore.kernel.org/r/20250417111337.38142-7-hdegoede@redhat.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
| -rw-r--r-- | drivers/platform/x86/intel/int3472/clk_and_regulator.c | 7 | ||||
| -rw-r--r-- | drivers/platform/x86/intel/int3472/common.h | 13 | ||||
| -rw-r--r-- | drivers/platform/x86/intel/int3472/discrete.c | 4 |
3 files changed, 19 insertions, 5 deletions
diff --git a/drivers/platform/x86/intel/int3472/clk_and_regulator.c b/drivers/platform/x86/intel/int3472/clk_and_regulator.c index 1d116b6a4efd..0a46d48896ed 100644 --- a/drivers/platform/x86/intel/int3472/clk_and_regulator.c +++ b/drivers/platform/x86/intel/int3472/clk_and_regulator.c @@ -187,6 +187,7 @@ void skl_int3472_unregister_clock(struct int3472_discrete_device *int3472) int skl_int3472_register_regulator(struct int3472_discrete_device *int3472, struct gpio_desc *gpio, + unsigned int enable_time, const char *supply_name, const char *second_sensor) { @@ -227,9 +228,9 @@ int skl_int3472_register_regulator(struct int3472_discrete_device *int3472, snprintf(regulator->regulator_name, sizeof(regulator->regulator_name), "%s-%s", acpi_dev_name(int3472->adev), supply_name); - int3472->regulator.rdesc = INT3472_REGULATOR( - int3472->regulator.regulator_name, - &int3472_gpio_regulator_ops); + regulator->rdesc = INT3472_REGULATOR(regulator->regulator_name, + &int3472_gpio_regulator_ops, + enable_time, GPIO_REGULATOR_OFF_ON_DELAY); cfg.dev = &int3472->adev->dev; cfg.init_data = &init_data; diff --git a/drivers/platform/x86/intel/int3472/common.h b/drivers/platform/x86/intel/int3472/common.h index 4bfd60df06de..2af8dc1ed25e 100644 --- a/drivers/platform/x86/intel/int3472/common.h +++ b/drivers/platform/x86/intel/int3472/common.h @@ -32,17 +32,27 @@ #define GPIO_REGULATOR_NAME_LENGTH (12 + GPIO_SUPPLY_NAME_LENGTH) /* lower- and upper-case mapping */ #define GPIO_REGULATOR_SUPPLY_MAP_COUNT 2 +/* + * Ensure the GPIO is driven low/high for at least 2 ms before changing. + * + * 2 ms has been chosen because it is the minimum time ovXXXX sensors need to + * have their reset line driven logical high to properly register a reset. + */ +#define GPIO_REGULATOR_ENABLE_TIME (2 * USEC_PER_MSEC) +#define GPIO_REGULATOR_OFF_ON_DELAY (2 * USEC_PER_MSEC) #define INT3472_LED_MAX_NAME_LEN 32 #define CIO2_SENSOR_SSDB_MCLKSPEED_OFFSET 86 -#define INT3472_REGULATOR(_name, _ops) \ +#define INT3472_REGULATOR(_name, _ops, _enable_time, _off_on_delay) \ (const struct regulator_desc) { \ .name = _name, \ .type = REGULATOR_VOLTAGE, \ .ops = _ops, \ .owner = THIS_MODULE, \ + .enable_time = _enable_time, \ + .off_on_delay = _off_on_delay, \ } #define to_int3472_clk(hw) \ @@ -134,6 +144,7 @@ void skl_int3472_unregister_clock(struct int3472_discrete_device *int3472); int skl_int3472_register_regulator(struct int3472_discrete_device *int3472, struct gpio_desc *gpio, + unsigned int enable_time, const char *supply_name, const char *second_sensor); void skl_int3472_unregister_regulator(struct int3472_discrete_device *int3472); diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c index f6dae82739e5..a2db4fae0e6d 100644 --- a/drivers/platform/x86/intel/int3472/discrete.c +++ b/drivers/platform/x86/intel/int3472/discrete.c @@ -311,7 +311,9 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares, break; case INT3472_GPIO_TYPE_POWER_ENABLE: - ret = skl_int3472_register_regulator(int3472, gpio, con_id, + ret = skl_int3472_register_regulator(int3472, gpio, + GPIO_REGULATOR_ENABLE_TIME, + con_id, int3472->quirks.avdd_second_sensor); if (ret) err_msg = "Failed to map regulator to sensor\n"; |