linux-kernel - [PATCH 4.9 11/93] mmc: core: Fix access to HS400-ES devices

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Date:   Wed,  9 Aug 2017 11:13:04 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anssi Hannula <anssi.hannula@...wise.fi>,
        Douglas Anderson <dianders@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Shawn Lin <shawn.lin@...k-chip.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.9 11/93] mmc: core: Fix access to HS400-ES devices

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

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

From: Guenter Roeck <linux@...ck-us.net>

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@...wise.fi>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: Brian Norris <briannorris@...omium.org>
Fixes: 3d4ef329757c ("mmc: core: fix multi-bit bus width ...")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Shawn Lin <shawn.lin@...k-chip.com>
Tested-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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)) {