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Subject[PATCH 4/4] ASoC: da7213: Improve 32KHz mode PLL locking
To aid PLL in locking on to a 32KHz MCLK, some register mods
are made during PLL configuration, and when enabling the DAI,
to achieve the full range of sample rates.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
---
sound/soc/codecs/da7213.c | 25 ++++++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/da7213.c b/sound/soc/codecs/da7213.c
index 79b8324..095fe40 100644
--- a/sound/soc/codecs/da7213.c
+++ b/sound/soc/codecs/da7213.c
@@ -750,11 +750,18 @@ static int da7213_dai_event(struct snd_soc_dapm_widget *w,
snd_soc_update_bits(codec, DA7213_PC_COUNT,
DA7213_PC_FREERUN_MASK, 0);

- /* Slave mode, if SRM not enabled no need for status checks */
+ /* If SRM not enabled then nothing more to do */
pll_ctrl = snd_soc_read(codec, DA7213_PLL_CTRL);
if (!(pll_ctrl & DA7213_PLL_SRM_EN))
return 0;

+ /* Assist 32KHz mode PLL lock */
+ if (pll_ctrl & DA7213_PLL_32K_MODE) {
+ snd_soc_write(codec, 0xF0, 0x8B);
+ snd_soc_write(codec, 0xF2, 0x03);
+ snd_soc_write(codec, 0xF0, 0x00);
+ }
+
/* Check SRM has locked */
do {
pll_status = snd_soc_read(codec, DA7213_PLL_STATUS);
@@ -771,6 +778,14 @@ static int da7213_dai_event(struct snd_soc_dapm_widget *w,

return 0;
case SND_SOC_DAPM_POST_PMD:
+ /* Revert 32KHz PLL lock udpates if applied previously */
+ pll_ctrl = snd_soc_read(codec, DA7213_PLL_CTRL);
+ if (pll_ctrl & DA7213_PLL_32K_MODE) {
+ snd_soc_write(codec, 0xF0, 0x8B);
+ snd_soc_write(codec, 0xF2, 0x01);
+ snd_soc_write(codec, 0xF0, 0x00);
+ }
+
/* PC free-running */
snd_soc_update_bits(codec, DA7213_PC_COUNT,
DA7213_PC_FREERUN_MASK,
@@ -1428,6 +1443,14 @@ static int da7213_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
DA7213_PLL_INDIV_MASK | DA7213_PLL_MODE_MASK,
pll_ctrl);

+ /* Assist 32KHz mode PLL lock */
+ if (source == DA7213_SYSCLK_PLL_32KHZ) {
+ snd_soc_write(codec, 0xF0, 0x8B);
+ snd_soc_write(codec, 0xF1, 0x03);
+ snd_soc_write(codec, 0xF1, 0x01);
+ snd_soc_write(codec, 0xF0, 0x00);
+ }
+
return 0;
}

--
1.9.3
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