Commit 73478755 authored by Axel Lin's avatar Axel Lin Committed by Mark Brown
Browse files

ASoC: wm8995: Slightly optimize configure_clock 



snd_soc_update_bits() will only write new register value
if the old value is different from the new value.
In additional, snd_soc_update_bits() returns 0 for no change.
No need to read WM8995_CLOCKING_1 register before calling snd_soc_update_bits().

Signed-off-by: default avatarAxel Lin <axel.lin@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 04f45c49

sound/soc/codecs/wm8995.c

+4 −8
Original line number Diff line number Diff line
@@ -485,7 +485,7 @@ static int configure_aif_clock(struct snd_soc_codec *codec, int aif) 
static int configure_clock(struct snd_soc_codec *codec)

{

	struct wm8995_priv *wm8995;

	int old, new;

	int change, new;



	wm8995 = snd_soc_codec_get_drvdata(codec);
@@ -509,14 +509,10 @@ static int configure_clock(struct snd_soc_codec *codec) 
	else

		new = 0;



	old = snd_soc_read(codec, WM8995_CLOCKING_1) & WM8995_SYSCLK_SRC;



	/* If there's no change then we're done. */

	if (old == new)

		return 0;



	snd_soc_update_bits(codec, WM8995_CLOCKING_1,

	change = snd_soc_update_bits(codec, WM8995_CLOCKING_1,

				     WM8995_SYSCLK_SRC_MASK, new);

	if (!change)

		return 0;



	snd_soc_dapm_sync(&codec->dapm);