From: Hans de Goede <hdegoede@xxxxxxxxxx>
commit cf5ac2d45f6e4d11ad78e7b10ae9a4121ba5e995 upstream.
acpi_get_and_request_gpiod() does not take a gpio_lookup_flags argument
specifying that the pins direction should be initialized to a specific
value.
This means that in some cases the pins might be left in input mode, causing
the gpiod_set() calls made to enable the clk / regulator to not work.
One example of this problem is the clk-enable GPIO for the ov01a1s sensor
on a Dell Latitude 9420 being left in input mode causing the clk to
never get enabled.
Explicitly set the direction of the pins to output to fix this.
Fixes: 5de691bffe57 ("platform/x86: Add intel_skl_int3472 driver")
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy@xxxxxxxxxx>
Reviewed-by: Daniel Scally <djrscally@xxxxxxxxx>
Reviewed-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230111201426.947853-1-hdegoede@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/platform/x86/intel/int3472/clk_and_regulator.c | 3 +++
drivers/platform/x86/intel/int3472/discrete.c | 4 ++++
2 files changed, 7 insertions(+)
--- a/drivers/platform/x86/intel/int3472/clk_and_regulator.c
+++ b/drivers/platform/x86/intel/int3472/clk_and_regulator.c
@@ -181,6 +181,9 @@ int skl_int3472_register_regulator(struc
return PTR_ERR(int3472->regulator.gpio);
}
+ /* Ensure the pin is in output mode and non-active state */
+ gpiod_direction_output(int3472->regulator.gpio, 0);
+
cfg.dev = &int3472->adev->dev;
cfg.init_data = &init_data;
cfg.ena_gpiod = int3472->regulator.gpio;
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -168,6 +168,8 @@ static int skl_int3472_map_gpio_to_clk(s
return (PTR_ERR(gpio));
int3472->clock.ena_gpio = gpio;
+ /* Ensure the pin is in output mode and non-active state */
+ gpiod_direction_output(int3472->clock.ena_gpio, 0);
break;
case INT3472_GPIO_TYPE_PRIVACY_LED:
gpio = acpi_get_and_request_gpiod(path, pin, "int3472,privacy-led");
@@ -175,6 +177,8 @@ static int skl_int3472_map_gpio_to_clk(s
return (PTR_ERR(gpio));
int3472->clock.led_gpio = gpio;
+ /* Ensure the pin is in output mode and non-active state */
+ gpiod_direction_output(int3472->clock.led_gpio, 0);
break;
default:
dev_err(int3472->dev, "Invalid GPIO type 0x%02x for clock\n", type);
