[PATCH 1/4] ARM: OMAP3 PM: Fix IO Daisychain sequence

[Vishwanath Sripathy]

> -----Original Message-----
> From: Kevin Hilman [mailto:khilman at ti.com]
> Sent: Wednesday, October 05, 2011 2:18 AM
> To: Vishwanath BS
> Cc: linux-omap at vger.kernel.org; linux-arm-
> kernel at lists.infradead.org; mohanv at ti.com
> Subject: Re: [PATCH 1/4] ARM: OMAP3 PM: Fix IO Daisychain sequence
>
> Hi Vishwa,
>
> Vishwanath BS <vishwanath.bs at ti.com> writes:
>
> > As per OMAP3630 TRM Section 3.5.7.2.2, 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[16] 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[16] 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[1] 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.
OK. I will update the original patchset from Mohan with your comments and
repost.

Vishwa
>
> Thanks,
>
> Kevin
>
> [1] http://marc.info/?l=linux-omap&w=2&r=1&s=%27Mohan+V%27&q=b