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drivers/rtc/rtc-twl.c: enable RTC irrespective of its prior state 

As part of probe, before enabling RTC, RTC_CTRL register is read to check
if it is already running.  If RTC is used by kernel alone, then this read
is not required.  Even if RTC was enabled already by boot loader, setting
STOP_RTC bit again should not harm.  Hence removed unwanted read
operation.

Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
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:
Venu Byravarasu 2012-03-23 15:02:33 -07:00 committed by Linus Torvalds
parent ce9f650636
commit f7439bcb74
1 changed files with 2 additions and 10 deletions
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12
drivers/rtc/rtc-twl.c
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@ -457,19 +457,11 @@ static int __devinit twl_rtc_probe(struct platform_device *pdev)
REG_INT_MSK_STS_A);
}
/* Check RTC module status, Enable if it is off */
ret = twl_rtc_read_u8(&rd_reg, REG_RTC_CTRL_REG);
dev_info(&pdev->dev, "Enabling TWL-RTC\n");
ret = twl_rtc_write_u8(BIT_RTC_CTRL_REG_STOP_RTC_M, REG_RTC_CTRL_REG);
if (ret < 0)
goto out1;
if (!(rd_reg & BIT_RTC_CTRL_REG_STOP_RTC_M)) {
dev_info(&pdev->dev, "Enabling TWL-RTC.\n");
rd_reg = BIT_RTC_CTRL_REG_STOP_RTC_M;
ret = twl_rtc_write_u8(rd_reg, REG_RTC_CTRL_REG);
if (ret < 0)
goto out1;
}
/* init cached IRQ enable bits */
ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
if (ret < 0)