diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c index 922c27177b5a..c6f93fb1dc20 100644 --- a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c +++ b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c @@ -734,29 +734,50 @@ static int pmic_gpio_get_direction(struct gpio_chip *chip, unsigned pin) (!pad->input_enabled && !pad->output_enabled)) return -EINVAL; - /* Make sure the state is aligned on what pmic_gpio_get() returns */ - return pad->input_enabled ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT; + /* + * An open-drain or open-source pad keeps its input buffer enabled while + * driving, so the output buffer is what tells the direction. + */ + return pad->output_enabled ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; } static int pmic_gpio_direction_input(struct gpio_chip *chip, unsigned pin) { struct pmic_gpio_state *state = gpiochip_get_data(chip); - unsigned long config; + unsigned long configs[2]; - config = pinconf_to_config_packed(PIN_CONFIG_INPUT_ENABLE, 1); + configs[0] = pinconf_to_config_packed(PIN_CONFIG_OUTPUT_ENABLE, 0); + configs[1] = pinconf_to_config_packed(PIN_CONFIG_INPUT_ENABLE, 1); - return pmic_gpio_config_set(state->ctrl, pin, &config, 1); + return pmic_gpio_config_set(state->ctrl, pin, configs, + ARRAY_SIZE(configs)); } static int pmic_gpio_direction_output(struct gpio_chip *chip, unsigned pin, int val) { struct pmic_gpio_state *state = gpiochip_get_data(chip); - unsigned long config; + struct pmic_gpio_pad *pad = state->ctrl->desc->pins[pin].drv_data; + unsigned long configs[2]; - config = pinconf_to_config_packed(PIN_CONFIG_LEVEL, val); + /* + * An open-drain or open-source pad only ever drives one rail, so the + * line can still be sampled while the pad is an output. Keep the input + * buffer enabled for those, so that pmic_gpio_get() reports what is on + * the wire rather than the value last written, and disable it for a + * CMOS pad, so that the pad ends up in DIGITAL_OUTPUT rather than + * DIGITAL_INPUT_OUTPUT. Program it either way, as the buffer may have + * been left in the opposite state by the bootloader or by an earlier + * direction change with a different buffer type. gpiolib applies + * PIN_CONFIG_DRIVE_OPEN_DRAIN before calling this, so buffer_type is + * already up to date here. + */ + configs[0] = pinconf_to_config_packed(PIN_CONFIG_INPUT_ENABLE, + pad->buffer_type != PMIC_GPIO_OUT_BUF_CMOS); + configs[1] = pinconf_to_config_packed(PIN_CONFIG_LEVEL, val); - return pmic_gpio_config_set(state->ctrl, pin, &config, 1); + return pmic_gpio_config_set(state->ctrl, pin, configs, + ARRAY_SIZE(configs)); } static int pmic_gpio_get(struct gpio_chip *chip, unsigned pin)