Hi, > The mmc core enable cache on default. But it only enables cache-flushing > when host supports cmd23 and eMMC supports reliable write. > For hosts which do not support cmd23 or eMMCs which do not support > reliable write, the cache can not be flushed by `sync` command. > This may leads to cache data lost. > This patch enables cache-flushing as long as cache is enabled, no matter host > supports cmd23 and/or eMMC supports reliable write or not. I looked in the spec and indeed couldn't find why enabling cache is dependent of cmd23/reliable write. Nor I was able to find the original commit log. Please allow few days to ask internally. Thanks, Avri
