[PATCH v3 2/3] gpio: thunderx: Utilize for_each_set_nbits macro
From: Syed Nayyar Waris <hidden>
Date: 2021-03-06 14:06:52
Also in:
linux-arch, linux-arm-kernel, linux-pm, lkml
Subsystem:
gpio subsystem, the rest, thunderx gpio driver · Maintainers:
Linus Walleij, Bartosz Golaszewski, Linus Torvalds, Robert Richter
This patch reimplements the thunderx_gpio_set_multiple function in drivers/gpio/gpio-thunderx.c to use the new for_each_set_nbits macro. Instead of looping for each bank in thunderx_gpio_set_multiple function, now we can skip bank which is not set and save cycles. Cc: Robert Richter <redacted> Cc: Bartosz Golaszewski <redacted> Signed-off-by: Syed Nayyar Waris <redacted> Acked-by: William Breathitt Gray <redacted> --- drivers/gpio/gpio-thunderx.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/gpio/gpio-thunderx.c b/drivers/gpio/gpio-thunderx.c
index 9f66deab46ea..4349e7393a1d 100644
--- a/drivers/gpio/gpio-thunderx.c
+++ b/drivers/gpio/gpio-thunderx.c@@ -16,7 +16,7 @@ #include <linux/pci.h> #include <linux/spinlock.h> #include <asm-generic/msi.h> - +#include "gpiolib.h" #define GPIO_RX_DAT 0x0 #define GPIO_TX_SET 0x8
@@ -275,12 +275,15 @@ static void thunderx_gpio_set_multiple(struct gpio_chip *chip, unsigned long *bits) { int bank; - u64 set_bits, clear_bits; + unsigned long set_bits, clear_bits, gpio_mask; + unsigned long offset; + struct thunderx_gpio *txgpio = gpiochip_get_data(chip); - for (bank = 0; bank <= chip->ngpio / 64; bank++) { - set_bits = bits[bank] & mask[bank]; - clear_bits = ~bits[bank] & mask[bank]; + for_each_set_nbits(offset, gpio_mask, mask, chip->ngpio, 64) { + bank = offset / 64; + set_bits = bits[bank] & gpio_mask; + clear_bits = ~bits[bank] & gpio_mask; writeq(set_bits, txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_SET); writeq(clear_bits, txgpio->register_base + (bank * GPIO_2ND_BANK) + GPIO_TX_CLR); }
--
2.29.0