Hi Uli,

On Fri, May 14, 2021 at 05:53:18PM +0200, Ulrich Hecht wrote:

The TMIO core sets a very low latency limit (100 us), but when using R-Car
SDHI hosts with SD cards, I have observed typical latencies of around 20-30
ms. This prevents runtime PM from working properly, and the devices remain
on continuously.

This patch sets the default latency limit to 100 ms to avoid that.

Signed-off-by: Ulrich Hecht <redacted>

Well, yes, I can confirm that this helps wrt the "always-enabled" clock.
However, when removing UHS cards, I now see this regression:

[    8.659916] mmcblk2: mmc2:0001 00000 29.8 GiB 
[    8.677304]  mmcblk2: p1
[    9.622918] mmc2: tuning execution failed: -5
[    9.627385] mmc2: card 0001 removed

It is interesting to see the "execution failed" error when *removing*
the card. Before removing, access to the card seems fine. I haven't
checked further, so I can't say yet if this is a related or seperate but
now undiscovered issue.

Thanks for the work so far!

   Wolfram