This is a note to let you know that I've just added the patch titled
mmc: core: Fix access to HS400-ES devices
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-core-fix-access-to-hs400-es-devices.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 773dc118756b1f38766063e90e582016be868f09 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@xxxxxxxxxxxx>
Date: Wed, 1 Mar 2017 14:11:47 -0800
Subject: mmc: core: Fix access to HS400-ES devices
From: Guenter Roeck <linux@xxxxxxxxxxxx>
commit 773dc118756b1f38766063e90e582016be868f09 upstream.
HS400-ES devices fail to initialize with the following error messages.
mmc1: power class selection to bus width 8 ddr 0 failed
mmc1: error -110 whilst initialising MMC card
This was seen on Samsung Chromebook Plus. Code analysis points to
commit 3d4ef329757c ("mmc: core: fix multi-bit bus width without
high-speed mode"), which attempts to set the bus width for all but
HS200 devices unconditionally. However, for HS400-ES, the bus width
is already selected.
Cc: Anssi Hannula <anssi.hannula@xxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Brian Norris <briannorris@xxxxxxxxxxxx>
Fixes: 3d4ef329757c ("mmc: core: fix multi-bit bus width ...")
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Reviewed-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxx>
Tested-by: Heiko Stuebner <heiko@xxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1581,7 +1581,7 @@ static int mmc_init_card(struct mmc_host
err = mmc_select_hs400(card);
if (err)
goto free_card;
- } else {
+ } else if (!mmc_card_hs400es(card)) {
/* Select the desired bus width optionally */
err = mmc_select_bus_width(card);
if (!IS_ERR_VALUE(err) && mmc_card_hs(card)) {
Patches currently in stable-queue which might be from linux@xxxxxxxxxxxx are
queue-4.4/mmc-core-fix-access-to-hs400-es-devices.patch