RE: [PATCH] mmc: block: enable cache-flushing when mmc cache is on

Avri Altman
2022-03-14T07:26:39Z

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