For UHS2, the signal voltage is supplied by vdd2 which is already 1.8v,
so no voltage switch required.
Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-uhs2.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
index 896a1c8e55cf..4dc3e904d7d2 100644
--- a/drivers/mmc/host/sdhci-uhs2.c
+++ b/drivers/mmc/host/sdhci-uhs2.c
@@ -196,6 +196,27 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
}
EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
+/*****************************************************************************\
+ * *
+ * MMC callbacks *
+ * *
+\*****************************************************************************/
+
+static int sdhci_uhs2_start_signal_voltage_switch(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+
+ /*
+ * For UHS2, the signal voltage is supplied by vdd2 which is
+ * already 1.8v so no voltage switch required.
+ */
+ if (sdhci_uhs2_mode(host))
+ return 0;
+
+ return sdhci_start_signal_voltage_switch(mmc, ios);
+}
+
/*****************************************************************************\
* *
* Driver init/exit *
@@ -204,6 +225,9 @@ EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
{
+ host->mmc_host_ops.start_signal_voltage_switch =
+ sdhci_uhs2_start_signal_voltage_switch;
+
return 0;
}
--
2.25.1
