mmc: sd: add reset bus_ops callback

Enable power cycle and re-initialization of SD cards via the reset
bus_ops. Power cycling a buggy SD card sometimes helps it get back on
track.

Signed-off-by: Johan Rudholm <johanru@axis.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 29fccdcacd68..36d5333838cb 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1197,6 +1197,12 @@ static int mmc_sd_power_restore(struct mmc_host *host)
         return ret;
 }
 
+static int mmc_sd_reset(struct mmc_host *host)
+{
+        mmc_power_cycle(host, host->card->ocr);
+        return mmc_sd_power_restore(host);
+}
+
 static const struct mmc_bus_ops mmc_sd_ops = {
         .remove = mmc_sd_remove,
         .detect = mmc_sd_detect,
@@ -1207,6 +1213,7 @@ static const struct mmc_bus_ops mmc_sd_ops = {
         .power_restore = mmc_sd_power_restore,
         .alive = mmc_sd_alive,
         .shutdown = mmc_sd_suspend,
+        .reset = mmc_sd_reset,
 };
 
 /*