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authorPeter Ujfalusi <peter.ujfalusi@nokia.com>2010-05-26 11:38:21 +0300
committerLiam Girdwood <lrg@slimlogic.co.uk>2010-05-31 11:08:59 +0100
commita3a29b55c70cefaac0d6fda170ccc85bd10e78bf (patch)
tree494a600fc7586f553e12d9f67adb0286bac8b770 /sound/soc/codecs/twl4030.c
parent2046f175bc7b4d37e33dbce6a867be3bacf685cc (diff)
ASoC: TWL4030: Add functionalty to reset the registers
Machine driver can instruct the codec driver to reset the chip registers to their default values at probe time. If machine driver does not provide setup data, then the registers are going to be reseted to their defaults, to be safe. If the developer on the platform confirms that the register reset is not needed, than it can be skipped, saving ~20ms time in probe. As safety measure do the register reset at remove time also. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'sound/soc/codecs/twl4030.c')
-rw-r--r--sound/soc/codecs/twl4030.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index 45de2aad283..b292c2d8f2a 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -262,6 +262,17 @@ static inline void twl4030_check_defaults(struct snd_soc_codec *codec)
difference, difference ? "Not OK" : "OK");
}
+static inline void twl4030_reset_registers(struct snd_soc_codec *codec)
+{
+ int i;
+
+ /* set all audio section registers to reasonable defaults */
+ for (i = TWL4030_REG_OPTION; i <= TWL4030_REG_MISC_SET_2; i++)
+ if (i != TWL4030_REG_APLL_CTL)
+ twl4030_write(codec, i, twl4030_reg[i]);
+
+}
+
static void twl4030_init_chip(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
@@ -275,6 +286,10 @@ static void twl4030_init_chip(struct platform_device *pdev)
if (setup && setup->check_defaults)
twl4030_check_defaults(codec);
+ /* Reset registers, if no setup data or if instructed to do so */
+ if (!setup || (setup && setup->reset_registers))
+ twl4030_reset_registers(codec);
+
/* Refresh APLL_CTL register from HW */
twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &byte,
TWL4030_REG_APLL_CTL);
@@ -2271,6 +2286,8 @@ static int twl4030_soc_remove(struct platform_device *pdev)
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->card->codec;
+ /* Reset registers to their chip default before leaving */
+ twl4030_reset_registers(codec);
twl4030_set_bias_level(codec, SND_SOC_BIAS_OFF);
snd_soc_free_pcms(socdev);
snd_soc_dapm_free(socdev);