tree 1faf6e99a591f9b6856bab6c8318eeeacb076051
parent e6f29a8dc1602e170daf955233891a9130573a55
author Aries Lee <arieslee@jmicron.com> 1292397264 +0100
committer Chris Ball <cjb@laptop.org> 1294548729 -0500

mmc: Test bus-width for old MMC devices

Some old MMC devices fail with the 4/8 bits the driver tries to use
exclusively.  This patch adds a test for the given bus setup and falls
back to the lower bit mode (until 1-bit mode) when the test fails.

[Major rework and refactoring by tiwai]
[Quirk addition and many fixes by prakity]

Signed-off-by: Aries Lee <arieslee@jmicron.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Philip Rakity <prakity@marvell.com>
Tested-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>