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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>
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1 changed files with 8 additions and 0 deletions
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@ -176,6 +176,10 @@ static int set_rtc_irq_bit(unsigned char bit)
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unsigned char val;
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int ret;
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/* if the bit is set, return from here */
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if (rtc_irq_bits & bit)
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return 0;
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val = rtc_irq_bits | bit;
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val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
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ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
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@ -193,6 +197,10 @@ static int mask_rtc_irq_bit(unsigned char bit)
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unsigned char val;
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int ret;
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/* if the bit is clear, return from here */
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if (!(rtc_irq_bits & bit))
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return 0;
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val = rtc_irq_bits & ~bit;
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ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
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if (ret == 0)
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