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drivers/rtc/rtc-twl.c: optimize IRQ bit access 

As the TWL RTC driver has a cached copy of enabled RTC interrupt bits in
variable rtc_irq_bits, that can be checked before really setting or
masking any of the interrupt bits.

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 15:02:32 -07:00 committed by Linus Torvalds
parent b4f0b880c8
commit ce9f650636
1 changed files with 8 additions and 0 deletions
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8
drivers/rtc/rtc-twl.c
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@ -176,6 +176,10 @@ static int set_rtc_irq_bit(unsigned char bit)
unsigned char val;
int ret;
/* if the bit is set, return from here */
if (rtc_irq_bits & bit)
return 0;
val = rtc_irq_bits | bit;
val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
@ -193,6 +197,10 @@ static int mask_rtc_irq_bit(unsigned char bit)
unsigned char val;
int ret;
/* if the bit is clear, return from here */
if (!(rtc_irq_bits & bit))
return 0;
val = rtc_irq_bits & ~bit;
ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
if (ret == 0)