On 23/02/16 01:32, Kevin Hilman wrote:

Eddie Huang [off-list ref] writes:

quoted

MT8173 E1 chip has one bug that if turn off USB power domain, vcore
power will also be off, thus cause modules using vcore power domain
fail, like MMC. The E1 chip only found on MT8173-evb board and this
board only has E1 chip, so implement this as a board specific
workaround.

Pwrapper use vcore power, so add pwrapper using USB power domain to
keep USB power domain not to zero and disabled.

Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>

Tested-by: Kevin Hilman <khilman@baylibre.com>

I send the patch in a pull request yesterday, so I won't be able to add 
your tag.
Thanks for testing and reporting this issue!

Matthias

I verified that this gets my mt8173-evb booting again when I enable MMC
support.

Thanks,

Kevin