diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-02-10 14:01:38 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-02-11 11:13:56 +0000 |
| commit | 22f226dd1496a0fa470e64a66e2da474f34eebf8 (patch) | |
| tree | 786da18ee0aa1337349575cff7e1f69801f05527 /sound/soc/codecs/wm8903.c | |
| parent | 66daaa59d5f0310238de183918e13062428fb59f (diff) | |
| download | lwn-22f226dd1496a0fa470e64a66e2da474f34eebf8.tar.gz lwn-22f226dd1496a0fa470e64a66e2da474f34eebf8.zip | |
ASoC: Don't use write sequencer to power up WM8903
The write sequencer sequencer sequence takes longer than is desirable
as it brings up a full playback path which is not required at this
point. Open coding the sequence cuts the startup time by two thirds.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'sound/soc/codecs/wm8903.c')
| -rw-r--r-- | sound/soc/codecs/wm8903.c | 73 |
1 files changed, 54 insertions, 19 deletions
diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c index b88c6165dd25..e203a3ec655a 100644 --- a/sound/soc/codecs/wm8903.c +++ b/sound/soc/codecs/wm8903.c @@ -297,15 +297,6 @@ static int wm8903_run_sequence(struct snd_soc_codec *codec, unsigned int start) return 0; } -static void wm8903_sync_reg_cache(struct snd_soc_codec *codec, u16 *cache) -{ - int i; - - /* There really ought to be something better we can do here :/ */ - for (i = 0; i < ARRAY_SIZE(wm8903_reg_defaults); i++) - cache[i] = codec->hw_read(codec, i); -} - static void wm8903_reset(struct snd_soc_codec *codec) { snd_soc_write(codec, WM8903_SW_RESET_AND_ID, 0); @@ -1142,6 +1133,7 @@ static int wm8903_set_bias_level(struct snd_soc_codec *codec, switch (level) { case SND_SOC_BIAS_ON: break; + case SND_SOC_BIAS_PREPARE: snd_soc_update_bits(codec, WM8903_VMID_CONTROL_0, WM8903_VMID_RES_MASK, @@ -1150,16 +1142,59 @@ static int wm8903_set_bias_level(struct snd_soc_codec *codec, case SND_SOC_BIAS_STANDBY: if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { - snd_soc_write(codec, WM8903_CLOCK_RATES_2, - WM8903_CLK_SYS_ENA); - - /* Change DC servo dither level in startup sequence */ - snd_soc_write(codec, WM8903_WRITE_SEQUENCER_0, 0x11); - snd_soc_write(codec, WM8903_WRITE_SEQUENCER_1, 0x1257); - snd_soc_write(codec, WM8903_WRITE_SEQUENCER_2, 0x2); - - wm8903_run_sequence(codec, 0); - wm8903_sync_reg_cache(codec, codec->reg_cache); + snd_soc_update_bits(codec, WM8903_BIAS_CONTROL_0, + WM8903_POBCTRL | WM8903_ISEL_MASK | + WM8903_STARTUP_BIAS_ENA | + WM8903_BIAS_ENA, + WM8903_POBCTRL | + (2 << WM8903_ISEL_SHIFT) | + WM8903_STARTUP_BIAS_ENA); + + snd_soc_update_bits(codec, + WM8903_ANALOGUE_SPK_OUTPUT_CONTROL_0, + WM8903_SPK_DISCHARGE, + WM8903_SPK_DISCHARGE); + + msleep(33); + + snd_soc_update_bits(codec, WM8903_POWER_MANAGEMENT_5, + WM8903_SPKL_ENA | WM8903_SPKR_ENA, + WM8903_SPKL_ENA | WM8903_SPKR_ENA); + + snd_soc_update_bits(codec, + WM8903_ANALOGUE_SPK_OUTPUT_CONTROL_0, + WM8903_SPK_DISCHARGE, 0); + + snd_soc_update_bits(codec, WM8903_VMID_CONTROL_0, + WM8903_VMID_TIE_ENA | + WM8903_BUFIO_ENA | + WM8903_VMID_IO_ENA | + WM8903_VMID_SOFT_MASK | + WM8903_VMID_RES_MASK | + WM8903_VMID_BUF_ENA, + WM8903_VMID_TIE_ENA | + WM8903_BUFIO_ENA | + WM8903_VMID_IO_ENA | + (2 << WM8903_VMID_SOFT_SHIFT) | + WM8903_VMID_RES_250K | + WM8903_VMID_BUF_ENA); + + msleep(129); + + snd_soc_update_bits(codec, WM8903_POWER_MANAGEMENT_5, + WM8903_SPKL_ENA | WM8903_SPKR_ENA, + 0); + + snd_soc_update_bits(codec, WM8903_VMID_CONTROL_0, + WM8903_VMID_SOFT_MASK, 0); + + snd_soc_update_bits(codec, WM8903_VMID_CONTROL_0, + WM8903_VMID_RES_MASK, + WM8903_VMID_RES_50K); + + snd_soc_update_bits(codec, WM8903_BIAS_CONTROL_0, + WM8903_BIAS_ENA | WM8903_POBCTRL, + WM8903_BIAS_ENA); /* By default no bypass paths are enabled so * enable Class W support. |