mmc: core: Simplify and fix for SD switch processing

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In mmc_read_switch, just do a one time mode 0 switch command to get the
support bits information, no need to do multiple times as the support
bits do not change with different arguments.

And no need to check current limit support bits, as these bits are
fixed according to the signal voltage. If the signal voltage is 1.8V,
the support bits would be 0xf and if the signal voltage is 3.3V, the
support bits would be 0x01. We will check host's ability to set the
current limit.

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

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Aaron Lu 2012-07-03 14:16:11 +08:00 • committed by Chris Ball

parent b67c6b411d

commit a39ca6ae0a

1 changed files with 22 additions and 72 deletions

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drivers/mmc/core/sd.c

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