On 02/24/2016 03:25 PM, Alexandre Belloni wrote:
> Hi,
>
> On 19/02/2016 at 11:09:45 -0700, Joshua Henderson wrote :
>> +static int pic32_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
>> +{
>> + struct pic32_rtc_dev *pdata = dev_get_drvdata(dev);
>> + void __iomem *base = pdata->reg_base;
>> + unsigned int tries = 0;
>> +
>> + clk_enable(pdata->clk);
>> +
>> + do {
>> + rtc_tm->tm_hour = readb(base + PIC32_RTCHOUR);
>> + rtc_tm->tm_min = readb(base + PIC32_RTCMIN);
>> + rtc_tm->tm_mon = readb(base + PIC32_RTCMON);
>> + rtc_tm->tm_mday = readb(base + PIC32_RTCDAY);
>> + rtc_tm->tm_year = readb(base + PIC32_RTCYEAR);
>> + rtc_tm->tm_sec = readb(base + PIC32_RTCSEC);
>> +
>> + /*
>> + * The only way to work out whether the system was mid-update
>> + * when we read it is to check the second counter, and if it
>> + * is zero, then we re-try the entire read.
>> + */
>> + tries = 1;
>> + } while (rtc_tm->tm_sec == 0 && tries < 2);
>> +
>
> This doesn't seem right. It will wait up to a second as tries will
> always be less than 2, this is probably not what you want.
Dang good catch. When fixed, it will work as expected:
# hwclock
tries 1
Sun Oct 17 19:23:59 2010 0.000000 seconds
# hwclock
tries 1
tries 2
Sun Oct 17 19:24:00 2010 0.000000 seconds
# hwclock
tries 1
Sun Oct 17 19:24:01 2010 0.000000 seconds
Josh
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