[PATCH 1/4] ARM: OMAP3 PM: Fix IO Daisychain sequence
khilman at ti.com
Tue Oct 4 16:47:48 EDT 2011
Vishwanath BS <vishwanath.bs at ti.com> writes:
> As per OMAP3630 TRM Section 188.8.131.52.2, the right sequence for enabling IO Daisy
> chain is "The I/O wake-up scheme is enabled by triggering the I/O daisy chain
> control (Wu clock) by programming a dedicated register
> (PRCM.PM_WKEN_WKUP EN_IO_CHAIN) in the PRCM module.Software must wait for
> the I/O daisy chain to complete before it transitions the PER domain to a
> nonfunctional state. This is done by polling a dedicated status bit in the PRCM
> module (PRCM.PM_WKST_WKUP ST_IO_CHAIN). This status bit must be cleared by
> software when the bit is read to 1".
> The original code was polling on a wrong register which is fixed in this patch.
> Also omap3_enable_io_chain is made non static as it's going to be used in
> subsequent patches.
> Signed-off-by: Vishwanath BS <vishwanath.bs at ti.com>
A fix for this was posted by Mohan V (added to Cc) back in June. It
recieved a few minor comments but an updated version was never posted.
Maybe you can ping Mohan or update that version fixing the comments
mentioned in that thread.
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