[PATCH 1/3] powerpc: mac: fix rtc read functions

[Andreas Schwab]

On Jun 18 2018, Mathieu Malaterre <malat at debian.org> wrote:

> Sadly, trying again today does not work anymore. Adding some printk
> just before WARN_ON:
>
> +printk(KERN_ERR " rtc DBG pmu_get_time1: %lld %d %lld \n", now,
> RTC_OFFSET, now - RTC_OFFSET );
> +printk(KERN_ERR " rtc DBG pmu_get_time2: %x %x %x %x %d \n",
> req.reply[0], req.reply[1], req.reply[2], req.reply[3] ,
> req.reply_len);
>
> leads to:
>
> [    0.000000]  rtc DBG pmu_get_time1: 14096662 2082844800 -2068748138
> [    0.000000]  rtc DBG pmu_get_time2: 0 d7 19 16 4

A good value would have 0xd7 in the first byte.  The problem is that
pmu_set_rtc_time is also broken, and leads to an invalid time value
stored in the RTC.  Since pmu_request is a varargs function passing
values of type time64_t without casting won't work.

You need to reset your RTC before you can continue.

I think the right fix is to change nowtime in pmu_set_rtc_time and
cuda_set_rtc_time back to unsigned int (or to u32).

Andreas.

-- 
Andreas Schwab, schwab at linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."