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pinctrl: mtk: Fix low level output voltage issue

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This patch is used to fix low level output voltage issue.
A pin is changed from input pull-up to output high.
The Dout value of the pin is default as 0.
If we change the direction of the pin before the dout value of the pin,
It maybe produce a low level output voltage between "input pull-up" and
"output high".

Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
Link: https://lore.kernel.org/r/20201120093058.7248-2-zhiyong.tao@mediatek.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Zhiyong Tao 2020-11-20 17:30:58 +08:00 committed by Linus Walleij
parent 89cce2b3f2
commit 517c3f5a86
1 changed files with 4 additions and 4 deletions
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8
drivers/pinctrl/mediatek/pinctrl-paris.c
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@ -247,13 +247,13 @@ static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR, !!arg);
break;
case PIN_CONFIG_OUTPUT:
err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
MTK_OUTPUT);
err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO,
arg);
if (err)
goto err;
err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO,
arg);
err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
MTK_OUTPUT);
break;
case PIN_CONFIG_INPUT_SCHMITT:
case PIN_CONFIG_INPUT_SCHMITT_ENABLE: