From d0fd93781c49cbe127f9e7a5b402e9b167c105a6 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Wed, 20 Aug 2008 14:09:03 -0700 Subject: [PATCH] Blackfin RTC Driver: dont let RTC programming in bootloaders randomly cause ~5 second boot delays Signed-off-by: Mike Frysinger Signed-off-by: Bryan Wu Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-bfin.c | 8 ++++++++ 1 file changed, 8 insertions(+) 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); -- GitLab