In sd_set_bus_speed_mode(), sd card speed is switched to sd_bus_speed.
However, the switch process may fail. When it happens, sd card is in
default speed mode, which is SDR12 as described in Spec3.0.
In such case, the sd_bus_speed should be updated according to status[16].
Signed-off-by: Gao Pan <pandy.gao@xxxxxxx>
Reviewed-by: Fugang Duan <B38611@xxxxxxxxxxxxx>
---
drivers/mmc/core/sd.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 73c762a..ac456ec 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -471,9 +471,11 @@ static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
if (err)
return err;
- if ((status[16] & 0xF) != card->sd_bus_speed)
+ if ((status[16] & 0xF) != card->sd_bus_speed) {
+ card->sd_bus_speed = status[16] & 0xF;
pr_warn("%s: Problem setting bus speed mode!\n",
mmc_hostname(card->host));
+ }
else {
mmc_set_timing(card->host, timing);
mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
--
1.9.1
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