On Wed, Jan 11, 2023 at 09:14:26PM +0100, Hans de Goede wrote:
> 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.
LGTM,
Reviewed-by: Andy Shevchenko <andy@xxxxxxxxxx>
thanks!
> Fixes: 5de691bffe57 ("platform/x86: Add intel_skl_int3472 driver")
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> Changes in v4:
> - Split out of the "int3472/media privacy LED support" series, so
> that this can be applied separately as it really is a bug-fix
> ---
> 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 b2342b3d78c7..74dc2cff799e 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 974a132db651..c42c3faa2c32 100644
> --- 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);
> --
> 2.39.0
>
--
With Best Regards,
Andy Shevchenko
