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i2c: i2c-gpio: Fix GPIO output

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The dm_gpio_set_dir_flags function cannot be used to update the
configuration of a GPIO pin because it does a bitwise OR with the
existing flags. Looks like commit 788ea83412 ("gpio: add function
_dm_gpio_set_dir_flags") has introduced this behaviour and the i2c-gpio
driver has been broken since.

Signed-off-by: Harm Berntsen <harm.berntsen@nedap.com>
CC: Heiko Schocher <hs@denx.de>
CC: Patrick Delaunay <patrick.delaunay@st.com>
This commit is contained in:
Harm Berntsen 2020-11-29 09:47:15 +00:00 • committed by Heiko Schocher
parent ea966d24ef
commit 6befb51f34
1 changed files with 10 additions and 7 deletions
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17
drivers/i2c/i2c-gpio.c
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@ -50,9 +50,10 @@ static void i2c_gpio_sda_set(struct i2c_gpio_bus *bus, int bit)
struct gpio_desc *sda = &bus->gpios[PIN_SDA];
if (bit)
dm_gpio_set_dir_flags(sda, GPIOD_IS_IN);
sda->flags = (sda->flags & ~GPIOD_IS_OUT) | GPIOD_IS_IN;
else
dm_gpio_set_dir_flags(sda, GPIOD_IS_OUT);
sda->flags = (sda->flags & (~GPIOD_IS_IN & ~GPIOD_IS_OUT_ACTIVE)) | GPIOD_IS_OUT;
dm_gpio_set_dir(sda);
}
static void i2c_gpio_scl_set(struct i2c_gpio_bus *bus, int bit)
@ -61,14 +62,16 @@ static void i2c_gpio_scl_set(struct i2c_gpio_bus *bus, int bit)
int count = 0;
if (bit) {
dm_gpio_set_dir_flags(scl, GPIOD_IS_IN);
scl->flags = (scl->flags & ~GPIOD_IS_OUT) | GPIOD_IS_IN;
dm_gpio_set_dir(scl);
while (!dm_gpio_get_value(scl) && count++ < 100000)
udelay(1);
if (!dm_gpio_get_value(scl))
pr_err("timeout waiting on slave to release scl\n");
} else {
dm_gpio_set_dir_flags(scl, GPIOD_IS_OUT);
scl->flags = (scl->flags & (~GPIOD_IS_IN & ~GPIOD_IS_OUT_ACTIVE)) | GPIOD_IS_OUT;
dm_gpio_set_dir(scl);
}
}
@ -76,11 +79,11 @@ static void i2c_gpio_scl_set(struct i2c_gpio_bus *bus, int bit)
static void i2c_gpio_scl_set_output_only(struct i2c_gpio_bus *bus, int bit)
{
struct gpio_desc *scl = &bus->gpios[PIN_SCL];
ulong flags = GPIOD_IS_OUT;
scl->flags = (scl->flags & (~GPIOD_IS_IN & ~GPIOD_IS_OUT_ACTIVE)) | GPIOD_IS_OUT;
if (bit)
flags |= GPIOD_IS_OUT_ACTIVE;
dm_gpio_set_dir_flags(scl, flags);
scl->flags |= GPIOD_IS_OUT_ACTIVE;
dm_gpio_set_dir(scl);
}
static void i2c_gpio_write_bit(struct i2c_gpio_bus *bus, int delay, uchar bit)