[PATCH 5.15 15/93] platform/x86: int3472/discrete: Ensure the clk/power enable pins are in output mode

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From: Hans de Goede <hdegoede@xxxxxxxxxx>

[ Upstream commit cf5ac2d45f6e4d11ad78e7b10ae9a4121ba5e995 ]

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: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/platform/x86/intel/int3472/clk_and_regulator.c | 3 +++
 drivers/platform/x86/intel/int3472/discrete.c          | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/clk_and_regulator.c b/drivers/platform/x86/intel/int3472/clk_and_regulator.c
index 1cf958983e868..28353addffa7f 100644
--- 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(struct int3472_discrete_device *int3472,
 		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;
diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index d2e8a87a077e7..401fa8f223d62 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -169,6 +169,8 @@ static int skl_int3472_map_gpio_to_clk(struct int3472_discrete_device *int3472,
 			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");
@@ -176,6 +178,8 @@ static int skl_int3472_map_gpio_to_clk(struct int3472_discrete_device *int3472,
 			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);
-- 
2.39.2






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