The .hw_reset() callback is optionally called when attaching
a host if and only if MMC_CAP_HW_RESET is set on the host,
which can be done from the device tree by putting the flag
cap-mmc-hw-reset in the DT node. This is sometimes helpful
for eMMC.
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Yann Gautier <yann.gautier@xxxxxxxxxxx>
Cc: Ludovic Barre <ludovic.barre@xxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/mmc/host/mmci.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index af2ed6013ef9..97fa5e67ca0c 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1883,6 +1883,15 @@ static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
return ret;
}
+static void mmci_hw_reset(struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+
+ reset_control_assert(host->rst);
+ udelay(2);
+ reset_control_deassert(host->rst);
+}
+
static struct mmc_host_ops mmci_ops = {
.request = mmci_request,
.pre_req = mmci_pre_request,
@@ -1891,6 +1900,7 @@ static struct mmc_host_ops mmci_ops = {
.get_ro = mmc_gpio_get_ro,
.get_cd = mmci_get_cd,
.start_signal_voltage_switch = mmci_sig_volt_switch,
+ .hw_reset = mmci_hw_reset,
};
static void mmci_probe_level_translator(struct mmc_host *mmc)
--
2.31.1
