Re: [PATCH 0/2] mmc: core: Implement support for cache ctrl for SD cards

From: Ulf Hansson
Date: Mon May 10 2021 - 05:44:55 EST

On Mon, 10 May 2021 at 09:40, Avri Altman <Avri.Altman@xxxxxxx> wrote:
> > In the SD spec v6.x the SD function extension registers for performance
> > enhancements were introduced. As a part of this an optional internal cache
> > on
> > the SD card can be used to improve performance.
> Just to verify that you are aware of that:
> In addition to the extension Registers that were defined in the physical core spec,
> there was a separate document that was released that suggest a common OS API's to those registers.
> It is called "SD specification part A5, SD Extensions API specification".

Thanks for the pointer!

I did have a very brief look at this. The conclusion I made is that
this is way over designed to enable support for features like cache
and poweroff notification. However, there may be other use cases that
could benefit from a user space library, along the lines of the SD
Extensions API, but I can't really tell.

Do you have an interest around this that you can share?

Thanks for reviewing!

Kind regards