[U-Boot] [PATCH] Fixing timing issue with eMMC on atmel MCI

[Gregory CLEMENT]

Hi,

I got similar issues that Marek had:
http://lists.denx.de/pipermail/u-boot/2015-October/231420.html.

When trying to initialize an eMMC on a SAMA5D4 based board the CPU
stuck. However, the fix sent by Marek was not enough for me and after
digging in the sources and trying many combinations I found that the
culprit was the switch command (CMD 6). A small delay was needed after
this command before the next one. The MMC spec seems to confirm that
by speaking about waiting 8 clocks after this command.

In the following patch I removed the delay introduced by Marek, and
instead I added a 8 clocks wait just after the switch command.

Marek, could you test it on your board and confirm that it is still
work for you?

Thanks,

Gregory CLEMENT (1):
  mmc: atmel: Properly fix clock configuration

 drivers/mmc/gen_atmel_mci.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

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2.5.0