| Message ID | 20201120093058.7248-2-zhiyong.tao@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pinctrl: fix low level output voltage issue | expand |
On Fri, Nov 20, 2020 at 10:31 AM Zhiyong Tao <zhiyong.tao@mediatek.com> wrote: > 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> Patch applied! Yours, Linus Walleij
diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c index 623af4410b07..039ce9be19c5 100644 --- a/drivers/pinctrl/mediatek/pinctrl-paris.c +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c @@ -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:
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> --- drivers/pinctrl/mediatek/pinctrl-paris.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)