linux-kernel - Re: interrupt handler not getting called after resume

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

On Wed, Dec 4, 2019 at 1:49 AM Pintu Agarwal <pintu.ping@...il.com> wrote:
>
> On Wed, 4 Dec 2019 at 00:28, anish singh <anish198519851985@...il.com> wrote:
> >
> > On Tue, Dec 3, 2019 at 6:12 AM Pintu Agarwal <pintu.ping@...il.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.