From 567c89032cfdda8047562abe450947ac01f2d3c7 Mon Sep 17 00:00:00 2001
From: Johan Rudholm <johan.rudholm@stericsson.com>
Date: Mon, 28 Jan 2013 15:08:27 +0100
Subject: [PATCH] mmc: core: Break out start_signal_voltage_switch

Allow callers to access the start_signal_voltage_switch host_ops
member without going through any cmd11 logic. This is mostly a
preparation for the following signal voltage switch patch.

Also, reset ios.signal_voltage to its original value if
start_signal_voltage_switch fails.

Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Chris Ball <cjb@laptop.org>
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