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gpio: aspeed: Set output latch before changing direction

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In aspeed_gpio_dir_out(), we need to establish the new output
value in the output latch *before* we change the direction
to output in order to avoid a glitch on the output line if
the previous value of the latch was different.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Benjamin Herrenschmidt 2018-05-17 18:11:56 +10:00 • committed by Linus Walleij
parent d5dbf9c266
commit af79492849
1 changed files with 1 additions and 2 deletions
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3
drivers/gpio/gpio-aspeed.c
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@ -287,11 +287,10 @@ static int aspeed_gpio_dir_out(struct gpio_chip *gc,
spin_lock_irqsave(&gpio->lock, flags);
__aspeed_gpio_set(gc, offset, val);
reg = ioread32(bank_val_reg(gpio, bank, GPIO_DIR));
iowrite32(reg | GPIO_BIT(offset), bank_val_reg(gpio, bank, GPIO_DIR));
__aspeed_gpio_set(gc, offset, val);
spin_unlock_irqrestore(&gpio->lock, flags);
return 0;