From: Guenter Roeck <linux@roeck-us.net>
Date: Thu, 2 Mar 2017 01:40:44 +0000 (+0800)
Subject: FROMLIST: mmc: core: Fix access to HS400-ES devices
X-Git-Tag: firefly_0821_release~504
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6173e2bc107f4c39e46cbe8c78d83ce6a3c7db9f;p=firefly-linux-kernel-4.4.55.git

FROMLIST: mmc: core: Fix access to HS400-ES devices

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.

Change-Id: I877b225a2ab9da623061288b2f908e956754107a
Cc: Anssi Hannula <anssi.hannula@bitwise.fi>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Brian Norris <briannorris@chromium.org>
Fixes: 3d4ef329757c ("mmc: core: fix multi-bit bus width ...")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chip.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 7a20989adabb..b394c437a8c8 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1661,7 +1661,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
 		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)) {