hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

gpio: pch: Optimize pch_gpio_get() 

The double negation is costly and can be avoided by shifting the
register value before masking the requested bit.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Jean Delvare 2016-01-05 14:23:47 +01:00 committed by Linus Walleij
parent 446f59acb7
commit 166814d841
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpio/gpio-pch.c
View File

@ -127,7 +127,7 @@ static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
{ {
struct pch_gpio *chip = gpiochip_get_data(gpio); struct pch_gpio *chip = gpiochip_get_data(gpio);
return !!(ioread32(&chip->reg->pi) & (1 << nr)); return (ioread32(&chip->reg->pi) >> nr) & 1;
} }
static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,