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authorMike Frysinger <vapier.adi@gmail.com>2008-08-21 01:09:03 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-21 02:40:30 +0400
commitd0fd93781c49cbe127f9e7a5b402e9b167c105a6 (patch)
tree1434323b3898dbb838b2f5cecf22b2bfc97906c8 /drivers/rtc/rtc-bfin.c
parent7f60459921bd24e86b21e07c42244c510b4f46b2 (diff)
downloadlinux-d0fd93781c49cbe127f9e7a5b402e9b167c105a6.tar.xz
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.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-bfin.c b/drivers/rtc/rtc-bfin.c
index 9d2da1cd7773..34439ce3967e 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);