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

From: [email-masked] (Kevin Hilman)
Date: Mon, 22 Oct 2012 14:46:17 -0700

Tero Kristo <[email-masked]> 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 <[email-masked]>
> Cc: Paul Walmsley <[email-masked]>
> Cc: Benoit Cousson <[email-masked]>
> Cc: Venkatraman S <[email-masked]>

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 <[email-masked]>

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

Thanks Tero for the fix,

Kevin