[PATCH v6 2/2] mmc: sd: add hw_reset callback

[Johan Rudholm <johan.rudholm@axis.com>]

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

Signed-off-by: Johan Rudholm <johanru@axis.com>
---
 drivers/mmc/core/sd.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 29fccdc..1228ef7 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_hw_reset(struct mmc_host *host)
+{
+	mmc_power_cycle(host, host->card->ocr);
+	return 0;
+}
+
 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,
+	.hw_reset = mmc_sd_hw_reset,
 };
 
 /*
-- 
1.7.2.5