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-rw-r--r--sound/soc/ux500/mop500_ab8500.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/sound/soc/ux500/mop500_ab8500.c b/sound/soc/ux500/mop500_ab8500.c
index 5e0f14634271..7e923ecf8901 100644
--- a/sound/soc/ux500/mop500_ab8500.c
+++ b/sound/soc/ux500/mop500_ab8500.c
@@ -16,6 +16,7 @@
#include <linux/device.h>
#include <linux/io.h>
#include <linux/clk.h>
+#include <linux/mutex.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
@@ -44,6 +45,12 @@
static unsigned int tx_slots = DEF_TX_SLOTS;
static unsigned int rx_slots = DEF_RX_SLOTS;
+/* Configuration consistency parameters */
+static DEFINE_MUTEX(mop500_ab8500_params_lock);
+static unsigned long mop500_ab8500_usage;
+static int mop500_ab8500_rate;
+static int mop500_ab8500_channels;
+
/* Clocks */
static const char * const enum_mclk[] = {
"SYSCLK",
@@ -231,6 +238,21 @@ static int mop500_ab8500_hw_params(struct snd_pcm_substream *substream,
substream->name,
substream->number);
+ /* Ensure configuration consistency between DAIs */
+ mutex_lock(&mop500_ab8500_params_lock);
+ if (mop500_ab8500_usage) {
+ if (mop500_ab8500_rate != params_rate(params) ||
+ mop500_ab8500_channels != params_channels(params)) {
+ mutex_unlock(&mop500_ab8500_params_lock);
+ return -EBUSY;
+ }
+ } else {
+ mop500_ab8500_rate = params_rate(params);
+ mop500_ab8500_channels = params_channels(params);
+ }
+ __set_bit(cpu_dai->id, &mop500_ab8500_usage);
+ mutex_unlock(&mop500_ab8500_params_lock);
+
channels = params_channels(params);
switch (params_format(params)) {
@@ -329,9 +351,22 @@ static int mop500_ab8500_hw_params(struct snd_pcm_substream *substream,
return 0;
}
+static int mop500_ab8500_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+
+ mutex_lock(&mop500_ab8500_params_lock);
+ __clear_bit(cpu_dai->id, &mop500_ab8500_usage);
+ mutex_unlock(&mop500_ab8500_params_lock);
+
+ return 0;
+}
+
struct snd_soc_ops mop500_ab8500_ops[] = {
{
.hw_params = mop500_ab8500_hw_params,
+ .hw_free = mop500_ab8500_hw_free,
.startup = mop500_ab8500_startup,
.shutdown = mop500_ab8500_shutdown,
}