tree 17e2327f1c98902e4ca887ef2deda61741987f7d
parent 44350993d01c901cc201ef2663fd0fded2e03d06
author ernest.zhang <ernest.zhang@bayhubtech.com> 1531722411 +0800
committer Ulf Hansson <ulf.hansson@linaro.org> 1532953417 +0200

mmc: sdhci: Add support for O2 eMMC HS200 mode

When use eMMC as boot device, the eMMC signaling voltage is tied to 1.8v
fixed output voltage, bios can set o2 sd host controller PCI configuration
register 0x308 bit4 to 1 to let driver skip 3.3v signaling voltage and
direct use 1.8v singling voltage in eMMC initialize process.

Signed-off-by: ernest.zhang <ernest.zhang@bayhubtech.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>