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 4.9-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-4.9 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 @@ -1690,7 +1690,7 @@ 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 (err > 0 && mmc_card_hs(card)) { Patches currently in stable-queue which might be from linux@xxxxxxxxxxxx are queue-4.9/mmc-core-fix-access-to-hs400-es-devices.patch