gpio: Add missing open drain/source handling to gpiod_set_value_cansleep()
Since commitf11a04464a
("i2c: gpio: Enable working over slow can_sleep GPIOs"), probing the i2c RTC connected to an i2c-gpio bus on r8a7740/armadillo fails with: rtc-s35390a 0-0030: error resetting chip rtc-s35390a: probe of 0-0030 failed with error -5 More debug code reveals: i2c i2c-0: master_xfer[0] R, addr=0x30, len=1 i2c i2c-0: NAK from device addr 0x30 msg #0 s35390a_get_reg: ret = -6 Commit02e479808b
("gpio: Alter semantics of *raw* operations to actually be raw") moved open drain/source handling from gpiod_set_raw_value_commit() to gpiod_set_value(), but forgot to take into account that gpiod_set_value_cansleep() also needs this handling. The i2c protocol mandates that i2c signals are open drain, hence i2c communication fails. Fix this by adding the missing handling to gpiod_set_value_cansleep(), using a new common helper gpiod_set_value_nocheck(). Fixes:02e479808b
("gpio: Alter semantics of *raw* operations to actually be raw") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> [removed underscore syntax, added kerneldoc] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -2892,6 +2892,27 @@ void gpiod_set_raw_value(struct gpio_desc *desc, int value)
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}
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}
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EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
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EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
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/**
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* gpiod_set_value_nocheck() - set a GPIO line value without checking
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* @desc: the descriptor to set the value on
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* @value: value to set
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*
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* This sets the value of a GPIO line backing a descriptor, applying
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* different semantic quirks like active low and open drain/source
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* handling.
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*/
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static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value)
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{
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if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
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value = !value;
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if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
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gpio_set_open_drain_value_commit(desc, value);
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else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
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gpio_set_open_source_value_commit(desc, value);
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else
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gpiod_set_raw_value_commit(desc, value);
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}
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/**
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/**
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* gpiod_set_value() - assign a gpio's value
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* gpiod_set_value() - assign a gpio's value
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* @desc: gpio whose value will be assigned
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* @desc: gpio whose value will be assigned
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@ -2906,16 +2927,8 @@ EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
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void gpiod_set_value(struct gpio_desc *desc, int value)
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void gpiod_set_value(struct gpio_desc *desc, int value)
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{
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{
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VALIDATE_DESC_VOID(desc);
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VALIDATE_DESC_VOID(desc);
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/* Should be using gpiod_set_value_cansleep() */
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WARN_ON(desc->gdev->chip->can_sleep);
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WARN_ON(desc->gdev->chip->can_sleep);
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if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
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gpiod_set_value_nocheck(desc, value);
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value = !value;
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if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
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gpio_set_open_drain_value_commit(desc, value);
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else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
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gpio_set_open_source_value_commit(desc, value);
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else
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gpiod_set_raw_value_commit(desc, value);
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}
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}
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EXPORT_SYMBOL_GPL(gpiod_set_value);
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EXPORT_SYMBOL_GPL(gpiod_set_value);
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@ -3243,9 +3256,7 @@ void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
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{
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{
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might_sleep_if(extra_checks);
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might_sleep_if(extra_checks);
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VALIDATE_DESC_VOID(desc);
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VALIDATE_DESC_VOID(desc);
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if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
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gpiod_set_value_nocheck(desc, value);
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value = !value;
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gpiod_set_raw_value_commit(desc, value);
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}
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}
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EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
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EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
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