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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 <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
View File

@ -1526,6 +1526,11 @@ static int wm8753_resume(struct platform_device *pdev)
for (i = 0; i < ARRAY_SIZE(wm8753_reg); i++) { for (i = 0; i < ARRAY_SIZE(wm8753_reg); i++) {
if (i + 1 == WM8753_RESET) if (i + 1 == WM8753_RESET)
continue; 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[0] = ((i + 1) << 1) | ((cache[i] >> 8) & 0x0001);
data[1] = cache[i] & 0x00ff; data[1] = cache[i] & 0x00ff;
codec->hw_write(codec->control_data, data, 2); codec->hw_write(codec->control_data, data, 2);