[PATCH 1/2] ASoC: simple-card-utils: add ignore_zero_sysclk flag

[Sheetal <sheetal@nvidia.com>]

Commit 2458adb8f92a ("SoC: simple-card-utils: set 0Hz to
sysclk when shutdown") updated the simple-card-util driver to
send 0Hz frequency requests during stream shutdown, which can
request frequencies lower than a platform may support.

Add ignore_zero_sysclk flag to struct simple_util_priv to allow drivers
to ignore these 0Hz sysclk requests when they would result in a clock
frequency below the hardware's minimum allowed rate.

Signed-off-by: Sheetal <sheetal@nvidia.com>
---
 include/sound/simple_card_utils.h     | 1 +
 sound/soc/generic/simple-card-utils.c | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index 915e6ae5f68d..02ede92e8269 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -81,6 +81,7 @@ struct simple_util_priv {
 	const struct snd_soc_ops *ops;
 	unsigned int dpcm_selectable:1;
 	unsigned int force_dpcm:1;
+	unsigned int ignore_zero_sysclk:1;
 };
 #define simple_priv_to_card(priv)	(&(priv)->snd_card)
 #define simple_priv_to_props(priv, i)	((priv)->dai_props + (i))
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 3115e1f37c0c..04ae242a51d0 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -383,7 +383,8 @@ void simple_util_shutdown(struct snd_pcm_substream *substream)
 	for_each_prop_dai_cpu(props, i, dai) {
 		struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, i);
 
-		if (props->mclk_fs && !dai->clk_fixed && !snd_soc_dai_active(cpu_dai))
+		if (!priv->ignore_zero_sysclk && props->mclk_fs &&
+		    !dai->clk_fixed && !snd_soc_dai_active(cpu_dai))
 			snd_soc_dai_set_sysclk(cpu_dai, 0, 0, dai->clk_direction);
 
 		simple_clk_disable(dai);
@@ -391,7 +392,8 @@ void simple_util_shutdown(struct snd_pcm_substream *substream)
 	for_each_prop_dai_codec(props, i, dai) {
 		struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, i);
 
-		if (props->mclk_fs && !dai->clk_fixed && !snd_soc_dai_active(codec_dai))
+		if (!priv->ignore_zero_sysclk && props->mclk_fs &&
+		    !dai->clk_fixed && !snd_soc_dai_active(codec_dai))
 			snd_soc_dai_set_sysclk(codec_dai, 0, 0, dai->clk_direction);
 
 		simple_clk_disable(dai);
-- 
2.17.1