Patch "mmc: core: Fix access to HS400-ES devices" has been added to the 4.9-stable tree

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 <[email protected]> know about it.

From: Guenter Roeck <[email protected]>
Date: Wed, 1 Mar 2017 14:11:47 -0800
Subject: mmc: core: Fix access to HS400-ES devices

From: Guenter Roeck <[email protected]>

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.

---
 drivers/mmc/core/mmc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -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 [email protected] are

queue-4.9/mmc-core-fix-access-to-hs400-es-devices.patch