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

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Hi,

On 1/11/23 21:14, 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.
> 
> Fixes: 5de691bffe57 ("platform/x86: Add intel_skl_int3472 driver")
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>

I've added this to my review-hans (soon to be fixes) branch now.

Thank you all for the reviews.

Regards,

Hans

> ---
> 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);




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