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From: anish singh <anish198519851985@gmail.com>
To: Pintu Agarwal <pintu.ping@gmail.com>
Cc: linux-pm@vger.kernel.org,
	open list <linux-kernel@vger.kernel.org>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE"
	<linux-arm-kernel@lists.infradead.org>,
	Kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: interrupt handler not getting called after resume
Date: Wed, 4 Dec 2019 11:25:23 -0800
Message-ID: <CAK7N6vrSKM8pU0+gquCu1x52GjBTaqFbwqtj_v8dzd+3-g4D1A@mail.gmail.com> (raw)
In-Reply-To: <CAOuPNLii26WcDnwD7ZkMX6ux7VRspw7nMEKJK0QF+j95YCHPOw@mail.gmail.com>

On Wed, Dec 4, 2019 at 1:49 AM Pintu Agarwal <pintu.ping@gmail.com> wrote:
>
> On Wed, 4 Dec 2019 at 00:28, anish singh <anish198519851985@gmail.com> wrote:
> >
> > On Tue, Dec 3, 2019 at 6:12 AM Pintu Agarwal <pintu.ping@gmail.com> wrote:
> > >
> > > Hi All,
> > >
> > > I have one general query.
> > >
> > > If an interrupt handler is NOT getting called (for one device) after
> > > the system resume (from snapshot image), then what could be the issue?
> >
> > Most likely during resume the interrupt was not enabled. So check
> > irq status registers to see in the working and non working case.
> >
> Oh sorry, I forgot to mention one thing.
> After resume, I can see that the interrupts are visible under /proc/interrupts.
> # cat /proc/interrupts
>            CPU0       CPU1
> [...]
> 416:          1          0       IPU  (null)
> 417:          0          0       IPU  (null)
> 418:          0          0       IPU  imx_drm  ===> HDMI
> 419:       2242       2       IPU  imx_drm   ===> LCD
> [...]
>
> The interrupts are coming only for LCD display and thus its irq
> handler is getting called.
> But the interrupts are not coming for HDMI case, thus HDMI gives
> "vblank timeout issue".

Is it something to do with MHL cable? Have you used scope
to find out if the interrupt was actually triggered?

> Apart from this I also tried calling enable_irq(irq) after resume, but
> it did not help much.

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Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03 14:10 Pintu Agarwal
2019-12-03 18:58 ` anish singh
2019-12-04  9:49   ` Pintu Agarwal
2019-12-04 19:25     ` anish singh [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-12-03 13:23 Pintu Agarwal

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