RTC , ds1307 I2C driver and NTP does not work.

Luong Ngo luong.ngo at gmail.com
Sat Nov 18 11:54:13 EST 2006


Joakim,
We are having the exact same problem. And if I understand correctly, the
schedule call in i2c-mpc driver is because we are waiting for the interrupt
signaling a byte transfer complete. If the interrupt does not yet come, the
driver call schedule to wait, both for polling mode and interrupt mode.  I
am not sure if it is some problem occurs making the interrupt not coming
quick enough. We still try to resolve. Please let us know if you find a
solution and we definitely will post our finding if we can resolve.

-Ngo

On 11/17/06, Kumar Gala <galak at kernel.crashing.org> wrote:
>
>
> On Nov 17, 2006, at 10:38 AM, Joakim Tjernlund wrote:
>
> > I get this when I activathte NTP and ntp "sync" the time the I2C HW
> > clock.
>
> You may be better off posting this to lkml and copy the i2c list (and
> rtc if one exists).  Since its more a driver issue than anything
> really ppc specific.  Clearly we are doing schedules() in mpc_xfer()
> and maybe we shouldn't be.
>
> - kumar
>
> > BUG: scheduling while atomic: swapper/0x00010000/0
> > Call Trace:^M
> > [C0245C80] [C000860C] show_stack+0x48/0x194 (unreliable)
> > [C0245CB0] [C01BEFF4] schedule+0x5d4/0x618
> > [C0245CF0] [C01BF9C8] schedule_timeout+0x70/0xd0
> > [C0245D30] [C014416C] i2c_wait+0x164/0x1d8
> > [C0245D80] [C0144490] mpc_xfer+0x2b0/0x3a8
> > [C0245DD0] [C01423E8] i2c_transfer+0x58/0x7c
> > [C0245DF0] [C0141124] ds1307_set_time+0x1bc/0x234
> > [C0245E00] [C013F82C] rtc_set_time+0xb0/0xb8^M
> > [C0245E20] [C000BFC4] set_rtc_class_time+0x34/0x58
> > [C0245E40] [C000C8D0] timer_interrupt+0x5a0/0x5fc
> > [C0245EE0] [C000F7B0] ret_from_except+0x0/0x14
> > --- Exception: 901 at cpu_idle+0xc8/0xf0
> >     LR = cpu_idle+0xec/0xf0
> > [C0245FC0] [C000388C] rest_init+0x28/0x38
> > [C0245FD0] [C01F36E0] start_kernel+0x1d8/0x228
> > [C0245FF0] [00003438] 0x3438
> >
> > I have activated RTC CLASS and have this in my board file:
> > #ifdef CONFIG_RTC_CLASS
> > late_initcall(rtc_class_hookup);
> > #endif
> >
> > kernel 2.6.19-rc5
> >
> >  Jocke
> >
> > _______________________________________________
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> > Linuxppc-dev at ozlabs.org
> > https://ozlabs.org/mailman/listinfo/linuxppc-dev
>
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