[PATCH] regmap: irq: Only update mask bits when doing initial mask

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

Don't write the full register, it's possible there's bits other than the
masks in the same register which we shouldn't be changing.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 drivers/base/regmap/regmap-irq.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 51b3cb1..c3ac97c 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -328,9 +328,11 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 	/* Mask all the interrupts by default */
 	for (i = 0; i < chip->num_regs; i++) {
 		d->mask_buf[i] = d->mask_buf_def[i];
-		ret = regmap_write(map, chip->mask_base + (i * map->reg_stride
-				   * d->irq_reg_stride),
-				   d->mask_buf[i]);
+		ret = regmap_update_bits(map, chip->mask_base +
+						(i * map->reg_stride *
+						 d->irq_reg_stride),
+					 d->mask_buf[i],
+					 d->mask_buf[i]);
 		if (ret != 0) {
 			dev_err(map->dev, "Failed to set masks in 0x%x: %d\n",
 				chip->mask_base + (i * map->reg_stride), ret);
-- 
1.7.10.4