[RFC] ARM: OMAP: hwmod: wait for sysreset complete after enabling hwmod

Tero Kristo [off-list ref] writes:

When waking up from off-mode, some IP blocks are reset automatically by
hardware. For this reason, software must wait until the reset has
completed before attempting to access the IP block.

This patch fixes for example the bug introduced by commit
6c31b2150ff96755d24e0ab6d6fea08a7bf5c44c ("mmc: omap_hsmmc: remove access
to SYSCONFIG register"), in which the MMC IP block is reset during
off-mode entry, but the code expects the module to be already available
during the execution of context restore.

Signed-off-by: Tero Kristo <redacted>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Benoit Cousson <redacted>
Cc: Venkatraman S <redacted>

I can confirm that this patch the regression in my OMAP3 PM tests where
suspend test (to retention or off) failed if ran after the off-idle
test.

Tested-by: Kevin Hilman <redacted>

on 3530/Overo, 3730/OveroSTORM, 3730/Beagle-xM

Thanks Tero for the fix,

Kevin