platform/x86: int3472/discrete: Ensure the clk/power enable pins are in output mode

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@redhat.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Daniel Scally <djrscally@gmail.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://lore.kernel.org/r/20230111201426.947853-1-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/platform/x86/intel/int3472/clk_and_regulator.c b/drivers/platform/x86/intel/int3472/clk_and_regulator.c
index b2342b3..74dc2cf 100644 (file)
--- 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 974a132..c42c3fa 100644 (file)
--- 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(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");
@@ -175,6 +177,8 @@ 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);