[PATCH 4.13 155/160] mmc: core: add driver strength selection when selecting hs400es

From: Greg Kroah-Hartman
Date: Tue Oct 10 2017 - 16:06:42 EST


4.13-stable review patch. If anyone has any objections, please let me know.

------------------

From: Chanho Min <chanho.min@xxxxxxx>

commit fb458864d9a78cc433fec7979acbe4078c82d7a8 upstream.

The driver strength selection is missed and required when selecting
hs400es. So, It is added here.

Fixes: 81ac2af65793ecf ("mmc: core: implement enhanced strobe support")
Signed-off-by: Hankyung Yu <hankyung.yu@xxxxxxx>
Signed-off-by: Chanho Min <chanho.min@xxxxxxx>
Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Reviewed-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/mmc/core/mmc.c | 36 +++++++++++++++++++-----------------
1 file changed, 19 insertions(+), 17 deletions(-)

--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1286,6 +1286,23 @@ out_err:
return err;
}

+static void mmc_select_driver_type(struct mmc_card *card)
+{
+ int card_drv_type, drive_strength, drv_type;
+
+ card_drv_type = card->ext_csd.raw_driver_strength |
+ mmc_driver_type_mask(0);
+
+ drive_strength = mmc_select_drive_strength(card,
+ card->ext_csd.hs200_max_dtr,
+ card_drv_type, &drv_type);
+
+ card->drive_strength = drive_strength;
+
+ if (drv_type)
+ mmc_set_driver_type(card->host, drv_type);
+}
+
static int mmc_select_hs400es(struct mmc_card *card)
{
struct mmc_host *host = card->host;
@@ -1341,6 +1358,8 @@ static int mmc_select_hs400es(struct mmc
goto out_err;
}

+ mmc_select_driver_type(card);
+
/* Switch card to HS400 */
val = EXT_CSD_TIMING_HS400 |
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
@@ -1374,23 +1393,6 @@ out_err:
return err;
}

-static void mmc_select_driver_type(struct mmc_card *card)
-{
- int card_drv_type, drive_strength, drv_type;
-
- card_drv_type = card->ext_csd.raw_driver_strength |
- mmc_driver_type_mask(0);
-
- drive_strength = mmc_select_drive_strength(card,
- card->ext_csd.hs200_max_dtr,
- card_drv_type, &drv_type);
-
- card->drive_strength = drive_strength;
-
- if (drv_type)
- mmc_set_driver_type(card->host, drv_type);
-}
-
/*
* For device supporting HS200 mode, the following sequence
* should be done before executing the tuning process.