Re: [PATCH] UCB1400: enable touchscreen interrupt unconditionally

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Fri, Aug 07, 2009 at 03:04:46PM +0200, Marek Vasut wrote:
> Dne Pá 7. srpna 2009 14:59:52 Pavel Revak napsal(a):
> > Hi,
> >
> > Sometimes, when I using the touchscreen, it stops working till next restart
> > and I see the following message:
> >  "ucb1400: unexpected IE_STATUS = 0x0"
> >
> > The following patch retriggers the touchscreen interrupt unconditionally.
> > This prevents hanging of the touchscreen in case of bogus interrupt
> > occurence.
> >
> > Signed-off-by: Pavel Revak <palo@bielyvlk.sk>
> > ---
> > diff --git a/drivers/input/touchscreen/ucb1400_ts.c
> > b/drivers/input/touchscreen/ucb1400_ts.c
> > index 5498662..6752de5 100644
> > --- a/drivers/input/touchscreen/ucb1400_ts.c
> > +++ b/drivers/input/touchscreen/ucb1400_ts.c
> > @@ -168,11 +168,11 @@ static void ucb1400_handle_pending_irq(struct
> > ucb1400_ts *ucb)
> >         ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr);
> >         ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
> >
> > -       if (isr & UCB_IE_TSPX) {
> > +       if (isr & UCB_IE_TSPX)
> >                 ucb1400_ts_irq_disable(ucb->ac97);
> > -               enable_irq(ucb->irq);
> > -       } else
> > -               printk(KERN_ERR "ucb1400: unexpected IE_STATUS = %#x\n",
> > isr);
> > +       else
> > +               dev_dbg(&ucb->ts_idev->dev, "ucb1400: unexpected IE_STATUS
> > = %#x\n", isr);
> > +       enable_irq(ucb->irq);
> >  }
> >
> >  static int ucb1400_ts_thread(void *_ucb)
> 
> Hi!
> 
> looks OK to me, it's a bug that was introduced in the spliting process last 
> year by me it seems.
> 
> Acked-by: Marek Vasut <marek.vasut@gmail.com>
> 
> Dmitry, can we get this in before .32? Thanks!

It would be helpful if I could locate the original patch, fishing
it from quoted text is not pleasant. Also, do we really need to
fiddle with enabling/disabling interrupt at all? It seems to be
edge-triggered...

-- 
Dmitry
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html