diff options
Diffstat (limited to 'drivers/mmc/core/pwrseq_emmc.c')
-rw-r--r-- | drivers/mmc/core/pwrseq_emmc.c | 41 |
1 files changed, 21 insertions, 20 deletions
diff --git a/drivers/mmc/core/pwrseq_emmc.c b/drivers/mmc/core/pwrseq_emmc.c index efb8a7965dd4..f6dde9edd7a3 100644 --- a/drivers/mmc/core/pwrseq_emmc.c +++ b/drivers/mmc/core/pwrseq_emmc.c @@ -1,10 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2015, Samsung Electronics Co., Ltd. * * Author: Marek Szyprowski <m.szyprowski@samsung.com> * - * License terms: GNU General Public License (GPL) version 2 - * * Simple eMMC hardware reset provider */ #include <linux/delay.h> @@ -30,19 +29,14 @@ struct mmc_pwrseq_emmc { #define to_pwrseq_emmc(p) container_of(p, struct mmc_pwrseq_emmc, pwrseq) -static void __mmc_pwrseq_emmc_reset(struct mmc_pwrseq_emmc *pwrseq) -{ - gpiod_set_value(pwrseq->reset_gpio, 1); - udelay(1); - gpiod_set_value(pwrseq->reset_gpio, 0); - udelay(200); -} - static void mmc_pwrseq_emmc_reset(struct mmc_host *host) { struct mmc_pwrseq_emmc *pwrseq = to_pwrseq_emmc(host->pwrseq); - __mmc_pwrseq_emmc_reset(pwrseq); + gpiod_set_value_cansleep(pwrseq->reset_gpio, 1); + udelay(1); + gpiod_set_value_cansleep(pwrseq->reset_gpio, 0); + udelay(200); } static int mmc_pwrseq_emmc_reset_nb(struct notifier_block *this, @@ -50,8 +44,11 @@ static int mmc_pwrseq_emmc_reset_nb(struct notifier_block *this, { struct mmc_pwrseq_emmc *pwrseq = container_of(this, struct mmc_pwrseq_emmc, reset_nb); + gpiod_set_value(pwrseq->reset_gpio, 1); + udelay(1); + gpiod_set_value(pwrseq->reset_gpio, 0); + udelay(200); - __mmc_pwrseq_emmc_reset(pwrseq); return NOTIFY_DONE; } @@ -72,14 +69,18 @@ static int mmc_pwrseq_emmc_probe(struct platform_device *pdev) if (IS_ERR(pwrseq->reset_gpio)) return PTR_ERR(pwrseq->reset_gpio); - /* - * register reset handler to ensure emmc reset also from - * emergency_reboot(), priority 255 is the highest priority - * so it will be executed before any system reboot handler. - */ - pwrseq->reset_nb.notifier_call = mmc_pwrseq_emmc_reset_nb; - pwrseq->reset_nb.priority = 255; - register_restart_handler(&pwrseq->reset_nb); + if (!gpiod_cansleep(pwrseq->reset_gpio)) { + /* + * register reset handler to ensure emmc reset also from + * emergency_reboot(), priority 255 is the highest priority + * so it will be executed before any system reboot handler. + */ + pwrseq->reset_nb.notifier_call = mmc_pwrseq_emmc_reset_nb; + pwrseq->reset_nb.priority = 255; + register_restart_handler(&pwrseq->reset_nb); + } else { + dev_notice(dev, "EMMC reset pin tied to a sleepy GPIO driver; reset on emergency-reboot disabled\n"); + } pwrseq->pwrseq.ops = &mmc_pwrseq_emmc_ops; pwrseq->pwrseq.dev = dev; |