[i2c] FW: RTC , ds1307 I2C driver and NTP does not work.

Joakim Tjernlund joakim.tjernlund at transmode.se
Fri Nov 17 18:38:10 CET 2006

switching to kernel/i2c list, see below for details.


-----Original Message-----
From: Kumar Gala [mailto:galak at kernel.crashing.org] 
Sent: 17 November 2006 17:57
To: Joakim Tjernlund
Cc: linuxppc-dev at ozlabs.org
Subject: Re: RTC , ds1307 I2C driver and NTP does not work.

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:
> late_initcall(rtc_class_hookup);
> #endif
> kernel 2.6.19-rc5
>  Jocke
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