From e102dc7a5498439bf72ae9f6457f2e7fe09a4ae0 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Tue, 18 Feb 2014 14:26:06 +0100 Subject: rtc: mv: reset date if after year 2038 Dates after January, 19th 2038 are badly handled by userspace due to the time being stored on 32 bits. This causes issues on some Marvell platform on which the RTC is initialized by default to a date that's beyond 2038, causing a really weird behavior of the RTC. In order to avoid that, reset the date to a sane value if the RTC is beyond 2038. Signed-off-by: Thomas Petazzoni Signed-off-by: Jason Cooper --- drivers/rtc/rtc-mv.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/rtc/rtc-mv.c b/drivers/rtc/rtc-mv.c index d536c5962c9..d15a999363f 100644 --- a/drivers/rtc/rtc-mv.c +++ b/drivers/rtc/rtc-mv.c @@ -222,6 +222,7 @@ static int __init mv_rtc_probe(struct platform_device *pdev) struct resource *res; struct rtc_plat_data *pdata; u32 rtc_time; + u32 rtc_date; int ret = 0; pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); @@ -257,6 +258,17 @@ static int __init mv_rtc_probe(struct platform_device *pdev) } } + /* + * A date after January 19th, 2038 does not fit on 32 bits and + * will confuse the kernel and userspace. Reset to a sane date + * (January 1st, 2013) if we're after 2038. + */ + rtc_date = readl(pdata->ioaddr + RTC_DATE_REG_OFFS); + if (bcd2bin((rtc_date >> RTC_YEAR_OFFS) & 0xff) >= 38) { + dev_info(&pdev->dev, "invalid RTC date, resetting to January 1st, 2013\n"); + writel(0x130101, pdata->ioaddr + RTC_DATE_REG_OFFS); + } + pdata->irq = platform_get_irq(pdev, 0); platform_set_drvdata(pdev, pdata); -- cgit v1.2.3-70-g09d2