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Default for delay is 1000us but custom delay can be passed in to work around hardware issues such as slow RC discharge on MMC VDD rails. Signed-off-by: Judith Mendez --- Changes since v2: - Drop < 0 check when parsing DT property, device_property_read_u32 should allow only positive values. Change also per Ulf's review - Remove upper limit check, also per Ulf's review - Use fsleep() instead of custom logic in mmc_delay_us(), per Sebastian's review - Return immediately if 0 in mmc_delay_us(), since no delay should now be valid as per Ulf's review --- drivers/mmc/core/core.c | 2 +- drivers/mmc/core/core.h | 8 ++++++++ drivers/mmc/core/host.c | 4 ++++ include/linux/mmc/host.h | 1 + 4 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 29e80e5f928e9..9472041fe1c20 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1388,7 +1388,7 @@ void mmc_power_off(struct mmc_host *host) * XO-1.5, require a short delay after poweroff before the card * can be successfully turned on again. */ - mmc_delay(1); + mmc_delay_us(host->ios.power_off_delay_us); } void mmc_power_cycle(struct mmc_host *host, u32 ocr) diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h index a028b48be1644..601c73761e886 100644 --- a/drivers/mmc/core/core.h +++ b/drivers/mmc/core/core.h @@ -73,6 +73,14 @@ static inline void mmc_delay(unsigned int ms) msleep(ms); } +static inline void mmc_delay_us(unsigned int us) +{ + if (us == 0) + return; + + fsleep(us); +} + void mmc_rescan(struct work_struct *work); void mmc_start_host(struct mmc_host *host); void __mmc_stop_host(struct mmc_host *host); diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index b7ce3137d4529..ac1846e0e7fbd 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -421,6 +421,9 @@ int mmc_of_parse(struct mmc_host *host) device_property_read_u32(dev, "post-power-on-delay-ms", &host->ios.power_delay_ms); + device_property_read_u32(dev, "power-off-delay-us", + &host->ios.power_off_delay_us); + return mmc_pwrseq_alloc(host); } @@ -574,6 +577,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev) host->fixed_drv_type = -EINVAL; host->ios.power_delay_ms = 10; + host->ios.power_off_delay_us = 1000; host->ios.power_mode = MMC_POWER_UNDEFINED; return host; diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index ba84f02c2a101..714417466707c 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -23,6 +23,7 @@ struct mmc_ios { unsigned int clock; /* clock rate */ unsigned short vdd; unsigned int power_delay_ms; /* waiting for stable power */ + unsigned int power_off_delay_us; /* waiting for power discharge */ /* vdd stores the bit number of the selected voltage range from below. */ -- 2.54.0