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gpio: htc-egpio: read output value from cache 

When the hardware is in output mode, reading the value from the
hardware is not giving the correct value back. Instead read the
value from the cache so we get the right value.

Suggested-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2016-11-13 11:50:22 +01:00
parent 9298539c04
commit 24b35ed9a8
1 changed files with 8 additions and 4 deletions
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12
drivers/gpio/gpio-htc-egpio.c
View File

@ -160,10 +160,14 @@ static int egpio_get(struct gpio_chip *chip, unsigned offset)
bit = egpio_bit(ei, offset);
reg = egpio->reg_start + egpio_pos(ei, offset);
value = egpio_readw(ei, reg);
pr_debug("readw(%p + %x) = %x\n",
ei->base_addr, reg << ei->bus_shift, value);
return !!(value & bit);
if (test_bit(offset, &egpio->is_out)) {
return !!(egpio->cached_values & (1 << offset));
} else {
value = egpio_readw(ei, reg);
pr_debug("readw(%p + %x) = %x\n",
ei->base_addr, reg << ei->bus_shift, value);
return !!(value & bit);
}
}
static int egpio_direction_input(struct gpio_chip *chip, unsigned offset)