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authorAdam Thomson <Adam.Thomson.Opensource@diasemi.com>2016-05-10 18:11:05 +0300
committerMark Brown <broonie@kernel.org>2016-05-10 21:24:19 +0300
commitd575b0b0f01a805508c5cf48b540f004e9b5de07 (patch)
tree823dd5f75ad5728872306deeada77d9d7146e994 /sound/soc/codecs/da7213.c
parenta0d5caeaebfd00853efa0080afc850e10be7b39a (diff)
downloadlinux-d575b0b0f01a805508c5cf48b540f004e9b5de07.tar.xz
ASoC: da7213: Add checking of SRM lock status before enabling DAI
When the codec is DAI clk slave, and the SRM feature of the PLL is being used, the enabling of the DAI should occur only after the PLL has locked to the incoming WCLK. This update adds checking to the the DAI widget event, so it waits for SRM to lock. There is also a timeout if that lock doesn't occur within a given time. Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/da7213.c')
-rw-r--r--sound/soc/codecs/da7213.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/sound/soc/codecs/da7213.c b/sound/soc/codecs/da7213.c
index 701bd6204747..680d11116ccf 100644
--- a/sound/soc/codecs/da7213.c
+++ b/sound/soc/codecs/da7213.c
@@ -734,6 +734,9 @@ static int da7213_dai_event(struct snd_soc_dapm_widget *w,
{
struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
struct da7213_priv *da7213 = snd_soc_codec_get_drvdata(codec);
+ u8 pll_ctrl, pll_status;
+ int i = 0;
+ bool srm_lock = false;
switch (event) {
case SND_SOC_DAPM_PRE_PMU:
@@ -742,6 +745,26 @@ static int da7213_dai_event(struct snd_soc_dapm_widget *w,
snd_soc_update_bits(codec, DA7213_DAI_CLK_MODE,
DA7213_DAI_CLK_EN_MASK,
DA7213_DAI_CLK_EN_MASK);
+
+ /* Slave mode, if SRM not enabled no need for status checks */
+ pll_ctrl = snd_soc_read(codec, DA7213_PLL_CTRL);
+ if (!(pll_ctrl & DA7213_PLL_SRM_EN))
+ return 0;
+
+ /* Check SRM has locked */
+ do {
+ pll_status = snd_soc_read(codec, DA7213_PLL_STATUS);
+ if (pll_status & DA7219_PLL_SRM_LOCK) {
+ srm_lock = true;
+ } else {
+ ++i;
+ msleep(50);
+ }
+ } while ((i < DA7213_SRM_CHECK_RETRIES) & (!srm_lock));
+
+ if (!srm_lock)
+ dev_warn(codec->dev, "SRM failed to lock\n");
+
return 0;
case SND_SOC_DAPM_POST_PMD:
/* Disable DAI clks if in master mode */