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authorAdam Thomson <Adam.Thomson.Opensource@diasemi.com>2016-05-10 16:11:05 +0100
committerMark Brown <broonie@kernel.org>2016-05-10 19:24:19 +0100
commitd575b0b0f01a805508c5cf48b540f004e9b5de07 (patch)
tree823dd5f75ad5728872306deeada77d9d7146e994 /sound
parenta0d5caeaebfd00853efa0080afc850e10be7b39a (diff)
downloadlinux-d575b0b0f01a805508c5cf48b540f004e9b5de07.tar.bz2
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')
-rw-r--r--sound/soc/codecs/da7213.c23
-rw-r--r--sound/soc/codecs/da7213.h4
2 files changed, 27 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 */
diff --git a/sound/soc/codecs/da7213.h b/sound/soc/codecs/da7213.h
index 5de5c2997e0c..af75340dea63 100644
--- a/sound/soc/codecs/da7213.h
+++ b/sound/soc/codecs/da7213.h
@@ -142,6 +142,9 @@
* Bit fields
*/
+/* DA7213_PLL_STATUS = 0x03 */
+#define DA7219_PLL_SRM_LOCK (0x1 << 1)
+
/* DA7213_SR = 0x22 */
#define DA7213_SR_8000 (0x1 << 0)
#define DA7213_SR_11025 (0x2 << 0)
@@ -502,6 +505,7 @@
#define DA7213_PLL_INDIV_10_20_MHZ_VAL 4
#define DA7213_PLL_INDIV_20_40_MHZ_VAL 8
#define DA7213_PLL_INDIV_40_54_MHZ_VAL 16
+#define DA7213_SRM_CHECK_RETRIES 8
enum da7213_clk_src {
DA7213_CLKSRC_MCLK = 0,