ASoC: Only restore non-default registers for WM8731

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c
index 3a497810f939..5a2619dbf283 100644
--- a/sound/soc/codecs/wm8731.c
+++ b/sound/soc/codecs/wm8731.c
@@ -456,6 +456,9 @@ static int wm8731_resume(struct platform_device *pdev)
 
         /* Sync reg_cache with the hardware */
         for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) {
+                if (cache[i] == wm8731_reg[i])
+                        continue;
+
                 data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
                 data[1] = cache[i] & 0x00ff;
                 codec->hw_write(codec->control_data, data, 2);