Enable power cycle and re-initialization of SD cards via the mmc_reset
function. Power cycling a buggy SD card sometimes helps it get back on
track.
Signed-off-by: Johan Rudholm <johanru@xxxxxxxx>
---
drivers/mmc/core/sd.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 0c44510..9ad46b2 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1177,6 +1177,21 @@ static int mmc_sd_runtime_resume(struct mmc_host *host)
return 0;
}
+static int mmc_sd_power_reset(struct mmc_host *host, int test)
+{
+ struct mmc_card *card = host->card;
+
+ if (!card)
+ return -EINVAL;
+
+ if (test == MMC_POWER_RESET_TEST)
+ return 0;
+
+ mmc_power_cycle(host, card->ocr);
+
+ return 0;
+}
+
static int mmc_sd_power_restore(struct mmc_host *host)
{
int ret;
@@ -1196,6 +1211,7 @@ static const struct mmc_bus_ops mmc_sd_ops = {
.suspend = mmc_sd_suspend,
.resume = mmc_sd_resume,
.power_restore = mmc_sd_power_restore,
+ .power_reset = mmc_sd_power_reset,
.alive = mmc_sd_alive,
.shutdown = mmc_sd_suspend,
};
--
1.7.2.5
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