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Commit d0fd9378 authored by Mike Frysinger's avatar Mike Frysinger Committed by Linus Torvalds
Browse files

Blackfin RTC Driver: dont let RTC programming in bootloaders randomly cause ~5 second boot delays 



Signed-off-by: default avatarMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7f604599

drivers/rtc/rtc-bfin.c

+8 −0
Original line number Diff line number Diff line
@@ -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);