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drivers/rtc/rtc-pl031.c: configure correct wday for 2000-01-01

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The reset date of the ST Micro version of PL031 is 2000-01-01.  The
correct weekday for 2000-01-01 is saturday, but pl031 is initialized to
sunday.  This may lead to alarm malfunction, so configure the correct
wday if RTC_DR indicates reset.

Signed-off-by: Rajkumar Kasirajan <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Cc: Mattias Wallin <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rajkumar Kasirajan 2012-05-17 17:03:24 -07:00 • committed by Linus Torvalds
commit c0a5f4a05a
1 changed files with 18 additions and 0 deletions
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18
drivers/rtc/rtc-pl031.c
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@ -312,6 +312,7 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
int ret;
struct pl031_local *ldata;
struct rtc_class_ops *ops = id->data;
unsigned long time;
ret = amba_request_regions(adev, NULL);
if (ret)
@ -343,6 +344,23 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
writel(readl(ldata->base + RTC_CR) | RTC_CR_CWEN,
ldata->base + RTC_CR);
/*
* On ST PL031 variants, the RTC reset value does not provide correct
* weekday for 2000-01-01. Correct the erroneous sunday to saturday.
*/
if (ldata->hw_designer == AMBA_VENDOR_ST) {
if (readl(ldata->base + RTC_YDR) == 0x2000) {
time = readl(ldata->base + RTC_DR);
if ((time &
(RTC_MON_MASK | RTC_MDAY_MASK | RTC_WDAY_MASK))
== 0x02120000) {
time = time | (0x7 << RTC_WDAY_SHIFT);
writel(0x2000, ldata->base + RTC_YLR);
writel(time, ldata->base + RTC_LR);
}
}
}
ldata->rtc = rtc_device_register("pl031", &adev->dev, ops,
THIS_MODULE);
if (IS_ERR(ldata->rtc)) {