]> git.karo-electronics.de Git - karo-tx-linux.git/commit
mmc: Prevent 1.8V switch for SD hosts that don't support UHS modes.
authorAl Cooper <acooper@gmail.com>
Fri, 16 Mar 2012 19:54:17 +0000 (15:54 -0400)
committerChris Ball <cjb@laptop.org>
Fri, 6 Apr 2012 00:32:32 +0000 (20:32 -0400)
commit4188bba0e9e7ba58d231b528df495666f2742b74
tree062ef9f10f7c55c7784dd3dc8ed059cab00ba7c8
parent79263f33b0f3abe26d74a66824b457b94bdbef9f
mmc: Prevent 1.8V switch for SD hosts that don't support UHS modes.

The driver should not try to switch to 1.8V when the SD 3.0 host
controller does not have any UHS capabilities bits set (SDR50, DDR50
or SDR104). See page 72 of "SD Specifications Part A2 SD Host
Controller Simplified Specification Version 3.00" under
"1.8V Signaling Enable". Instead of setting SDR12 and SDR25 in the host
capabilities data structure for all V3.0 host controllers, only set them
if SDR104, SDR50 or DDR50 is set in the host capabilities register. This
will prevent the switch to 1.8V later.

Signed-off-by: Al Cooper <acooper@gmail.com>
Acked-by: Arindam Nath <arindam.nath@amd.com>
Acked-by: Philip Rakity <prakity@marvell.com>
Acked-by: Girish K S <girish.shivananjappa@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
drivers/mmc/host/sdhci.c