RE: [PATCH 4/4] DSS2: clear spurious SYNC_LOST_DIGIT interrupts

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On Fri, 2010-03-05 at 16:19 +0100, ext Aguirre, Sergio wrote:
> Hi Ville,
> 
> > -----Original Message-----
> > From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap-
> > owner@xxxxxxxxxxxxxxx] On Behalf Of ville.syrjala@xxxxxxxxx
> > Sent: Friday, March 05, 2010 7:26 AM
> > To: Tomi Valkeinen
> > Cc: linux-fbdev@xxxxxxxxxxxxxxx; linux-omap@xxxxxxxxxxxxxxx; Ville Syrjälä
> > Subject: [PATCH 4/4] DSS2: clear spurious SYNC_LOST_DIGIT interrupts
> > 
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxx>
> > 
> > When DSS transitions from off mode to on VENC may generate a spurious
> > SYNC_LOST_DIGIT error. Just ack it when restoring the context. Also
> > restore IRQENABLE last to avoid triggering interrupts before the
> > context is fully restored.
> 
> (Tomi or anyone can correct me if I'm wrong)
> 
> AFAIK, The solution for spurious interrupts is to flush posted bus writes during interrupt handling, which can be achieved by reading the same register just after you have written it.
> 
> Tomi, what do you think?

That's a different spurious interrupt =).

In this case the IRQ mechanism from CPU side is working fine, but VENC
is just spamming the error interrupts, for unknown reason.

 Tomi


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