Messages in this thread Patch in this message | | | Subject | [PATCH RESEND 2/3] mfd: da903x: Ensure setting bits if new value is different from the old value | From | Axel Lin <> | Date | Mon, 19 Dec 2011 19:57:50 +0800 |
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It does not make sense to write new value only when all the bit_mask bits are zero. We need to write new value if the bit mask fields of new value is not equal to old value.
Signed-off-by: Axel Lin <axel.lin@gmail.com> --- drivers/mfd/da903x.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/mfd/da903x.c b/drivers/mfd/da903x.c index 62ce685..1924b85 100644 --- a/drivers/mfd/da903x.c +++ b/drivers/mfd/da903x.c @@ -182,7 +182,7 @@ int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask) if (ret) goto out; - if ((reg_val & bit_mask) == 0) { + if ((reg_val & bit_mask) != bit_mask) { reg_val |= bit_mask; ret = __da903x_write(chip->client, reg, reg_val); } -- 1.7.5.4
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