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ASoC: Only write back non-default registers when resuming WM8753

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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 <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-02-22 20:04:41 +00:00
parent c2bac1606a
commit e611bd8244
1 changed files with 5 additions and 0 deletions
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5
sound/soc/codecs/wm8753.c
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@ -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);