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authorVenu Byravarasu <vbyravarasu@nvidia.com>2012-03-23 15:02:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:39 -0700
commitf7439bcb74aca4234fedc336a21e169e6e33bb2e (patch)
tree815b214ea649e068711e5b36de3952f1221c717d /drivers/rtc
parentce9f650636d310e4c8febc821b0038e9918a12db (diff)
downloadlinux-f7439bcb74aca4234fedc336a21e169e6e33bb2e.tar.bz2
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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-twl.c12
1 files changed, 2 insertions, 10 deletions
diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
index 18dff5255670..18e4c0138a40 100644
--- a/drivers/rtc/rtc-twl.c
+++ b/drivers/rtc/rtc-twl.c
@@ -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)