DryIce , RTC not working on imx53.

[Alexandre Belloni]

+Cc Juergen

On 14/11/2017 at 08:12:03 -0200, Fabio Estevam wrote:
> Hi Patrick,
> 
> On Tue, Nov 14, 2017 at 3:00 AM, Patrick Brünn <P.Bruenn at beckhoff.com> wrote:
> >>From: Fabio Estevam [mailto:festevam at gmail.com]
> >>Sent: Montag, 13. November 2017 19:57
> >>> I don't recall of any recent change in this area.
> >>>
> > I don't think the behavior changed recently. I tried a kernel 4.4.65 and it shows the same symptoms. I guess Noel really means 3.19-> 4.0.
> 
> Or maybe by 'old kernel' he meant the vendor 2.6.35 kernel.
> 
> I have the impression that the dryice driver has never worked in
> mainlune for mx53.
> 

I doubt that because it seems to have been used by Pengutronix.

> > Unfortunately no. Did you run hwclock or rtctest?
> 
> Yes, this is what I get:
> 
> # hwclock -r -D
> hwclock from util-linux 2.31
> System Time: 14.876372
> Trying to open: /dev/rtc0
> Using the rtc interface to the clock.
> Last drift adjustment done at 2167 seconds after 1969
> Last calibrat[   14.892484] imxdi_rtc 53fa4000.srtc: Write-wait timeout val = 08
> ion done at 2167 seconds after 1969
> Hardware clock is on UTC time
> Assuming hardware clock is kept in UTC time.
> Waiting for clock tick...
> hwclock: select() to /dev/rtc0 to wait for clock tick timed out
> ...synchronization failed
> 
> 
> > I still see:
> > root at CX9020:~# cat /proc/interrupts | grep rtc
> >  40:          0      tzic  24 Edge      53fa4000.srtc
> >  41:          0      tzic  25 Edge      53fa4000.srtc
> > root at CX9020:~# hwclock -D -r
> > hwclock from util-linux 2.29.2
> > Using the /dev interface to the clock.
> > Last drift adjustment done at 1490885082 seconds after 1969
> > Last calibration done at 1490885082 seconds after 1969
> > Hardware clock is on UTC time
> > Assuming hardware clock is kept in UTC time.
> > Waiting for clock tick...
> > [   41.035269] irq 40: nobody cared (try booting with the "irqpoll" option)
> > [   41.042514] handlers:
> > [   41.044847] [<c06031e0>] dryice_irq
> > [   41.048398] Disabling IRQ #40
> 
> This error I don't get with the 2.31 hwclock version I tried.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com