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| author | Mike Frysinger <vapier.adi@gmail.com> | 2008-08-20 14:09:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-20 15:40:30 -0700 |
| commit | d0fd93781c49cbe127f9e7a5b402e9b167c105a6 (patch) | |
| tree | 1434323b3898dbb838b2f5cecf22b2bfc97906c8 /drivers/rtc/rtc-bfin.c | |
| parent | 7f60459921bd24e86b21e07c42244c510b4f46b2 (diff) | |
| download | linux-3.10-d0fd93781c49cbe127f9e7a5b402e9b167c105a6.tar.gz linux-3.10-d0fd93781c49cbe127f9e7a5b402e9b167c105a6.tar.bz2 linux-3.10-d0fd93781c49cbe127f9e7a5b402e9b167c105a6.zip | |
Blackfin RTC Driver: dont let RTC programming in bootloaders randomly cause ~5 second boot delays
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc/rtc-bfin.c')
| -rw-r--r-- | drivers/rtc/rtc-bfin.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-bfin.c b/drivers/rtc/rtc-bfin.c index 9d2da1cd777..34439ce3967 100644 --- a/drivers/rtc/rtc-bfin.c +++ b/drivers/rtc/rtc-bfin.c @@ -363,6 +363,7 @@ static int __devinit bfin_rtc_probe(struct platform_device *pdev) struct bfin_rtc *rtc; struct device *dev = &pdev->dev; int ret = 0; + unsigned long timeout; dev_dbg_stamp(dev); @@ -377,6 +378,13 @@ static int __devinit bfin_rtc_probe(struct platform_device *pdev) ret = request_irq(IRQ_RTC, bfin_rtc_interrupt, IRQF_SHARED, pdev->name, dev); if (unlikely(ret)) goto err; + /* sometimes the bootloader touched things, but the write complete was not + * enabled, so let's just do a quick timeout here since the IRQ will not fire ... + */ + timeout = jiffies + HZ; + while (bfin_read_RTC_ISTAT() & RTC_ISTAT_WRITE_PENDING) + if (time_after(jiffies, timeout)) + break; bfin_rtc_reset(dev, RTC_ISTAT_WRITE_COMPLETE); bfin_write_RTC_SWCNT(0); |