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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>
This commit is contained in:
Mike Frysinger 2008-08-20 14:09:03 -07:00 committed by Linus Torvalds
parent 7f60459921
commit d0fd93781c
1 changed files with 8 additions and 0 deletions
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8
drivers/rtc/rtc-bfin.c
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@ -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);