From: Niklas Cassel niklas.cassel@wdc.com
stable inclusion from stable-v5.10.101 commit 1ba45dd3266773852570a510020c4e0d695d3b87 bugzilla: https://gitee.com/openeuler/kernel/issues/I5669Z
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit cc38ef936840ac29204d806deb4d1836ec509594 ]
Setting the output of a GPIO to 1 using gpiod_set_value(), followed by reading the same GPIO using gpiod_get_value(), will currently yield an incorrect result.
This is because the SiFive GPIO device stores the output values in reg_set, not reg_dat.
Supply the flag BGPIOF_READ_OUTPUT_REG_SET to bgpio_init() so that the generic driver reads the correct register.
Fixes: 96868dce644d ("gpio/sifive: Add GPIO driver for SiFive SoCs") Signed-off-by: Niklas Cassel niklas.cassel@wdc.com Reviewed-by: Linus Walleij linus.walleij@linaro.org [Bartosz: added the Fixes tag] Signed-off-by: Bartosz Golaszewski brgl@bgdev.pl Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yu Liao liaoyu15@huawei.com Reviewed-by: Wei Li liwei391@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/gpio/gpio-sifive.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c index d5eb9ca11901..4f28fa73450c 100644 --- a/drivers/gpio/gpio-sifive.c +++ b/drivers/gpio/gpio-sifive.c @@ -206,7 +206,7 @@ static int sifive_gpio_probe(struct platform_device *pdev) NULL, chip->base + SIFIVE_GPIO_OUTPUT_EN, chip->base + SIFIVE_GPIO_INPUT_EN, - 0); + BGPIOF_READ_OUTPUT_REG_SET); if (ret) { dev_err(dev, "unable to init generic GPIO\n"); return ret;