From e611bd82441130991d7f4600dfd4632cebd417c5 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Sun, 22 Feb 2009 20:04:41 +0000 Subject: [PATCH] ASoC: Only write back non-default registers when resuming WM8753 This will reduce the number of writes done on resume, allowing that to complete faster (especially on systems with very slow I2C like the current Samsung driver). Signed-off-by: Mark Brown --- sound/soc/codecs/wm8753.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/soc/codecs/wm8753.c b/sound/soc/codecs/wm8753.c index bc29558149e9..2241204b5151 100644 --- a/sound/soc/codecs/wm8753.c +++ b/sound/soc/codecs/wm8753.c @@ -1526,6 +1526,11 @@ static int wm8753_resume(struct platform_device *pdev) for (i = 0; i < ARRAY_SIZE(wm8753_reg); i++) { if (i + 1 == WM8753_RESET) continue; + + /* No point in writing hardware default values back */ + if (cache[i] == wm8753_reg[i]) + continue; + data[0] = ((i + 1) << 1) | ((cache[i] >> 8) & 0x0001); data[1] = cache[i] & 0x00ff; codec->hw_write(codec->control_data, data, 2);