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From:   Venkata Prasad Potturu <venkataprasad.potturu@amd.com>
To:     <broonie@kernel.org>, <alsa-devel@alsa-project.org>
CC:     <vsujithkumar.reddy@amd.com>, <Vijendar.Mukunda@amd.com>,
        <Basavaraj.Hiregoudar@amd.com>, <Sunil-kumar.Dommati@amd.com>,
        <ssabakar@amd.com>, Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>,
        "Venkata Prasad Potturu" <venkataprasad.potturu@amd.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        V sujith kumar Reddy <Vsujithkumar.Reddy@amd.com>,
        "Charles Keepax" <ckeepax@opensource.cirrus.com>,
        Yang Yingliang <yangyingliang@huawei.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] ASoC: amd: acp: Initialize list to store acp_stream during pcm_open
Date:   Fri, 22 Jul 2022 19:05:22 +0530
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From: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>

We are currently allocating acp_stream during pcm_open and saving
it in static array corresponds to array index calculated based on
cpu dai->driver id. This approach will fail if we have single dai
linked to multiple pcm device as we will have same dai->driver id
or array index for multiple pcm open. Initialize new linked list
stream_list to store opened pcm stream info dynamically.

Signed-off-by: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>
Signed-off-by: Venkata Prasad Potturu <venkataprasad.potturu@amd.com>
Reviewed-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
---

Changes since v1:
    -- Fix compile error and remove unused variable.

 sound/soc/amd/acp/acp-platform.c | 33 ++++++++++++--------------------
 sound/soc/amd/acp/amd.h          |  3 ++-
 2 files changed, 14 insertions(+), 22 deletions(-)

diff --git a/sound/soc/amd/acp/acp-platform.c b/sound/soc/amd/acp/acp-platform.c
index 10730d33c3b0..20c0f75f7c97 100644
--- a/sound/soc/amd/acp/acp-platform.c
+++ b/sound/soc/amd/acp/acp-platform.c
@@ -94,7 +94,7 @@ static irqreturn_t i2s_irq_handler(int irq, void *data)
 	struct acp_resource *rsrc = adata->rsrc;
 	struct acp_stream *stream;
 	u16 i2s_flag = 0;
-	u32 ext_intr_stat, ext_intr_stat1, i;
+	u32 ext_intr_stat, ext_intr_stat1;
 
 	if (!adata)
 		return IRQ_NONE;
@@ -104,8 +104,7 @@ static irqreturn_t i2s_irq_handler(int irq, void *data)
 
 	ext_intr_stat = readl(ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used));
 
-	for (i = 0; i < ACP_MAX_STREAM; i++) {
-		stream = adata->stream[i];
+	list_for_each_entry(stream, &adata->stream_list, list) {
 		if (stream && (ext_intr_stat & stream->irq_bit)) {
 			writel(stream->irq_bit,
 			       ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used));
@@ -146,9 +145,8 @@ static void config_pte_for_stream(struct acp_dev_data *adata, struct acp_stream
 	writel(0x01, adata->acp_base + ACPAXI2AXI_ATU_CTRL);
 }
 
-static void config_acp_dma(struct acp_dev_data *adata, int cpu_id, int size)
+static void config_acp_dma(struct acp_dev_data *adata, struct acp_stream *stream, int size)
 {
-	struct acp_stream *stream = adata->stream[cpu_id];
 	struct snd_pcm_substream *substream = stream->substream;
 	struct acp_resource *rsrc = adata->rsrc;
 	dma_addr_t addr = substream->dma_buffer.addr;
@@ -174,13 +172,10 @@ static void config_acp_dma(struct acp_dev_data *adata, int cpu_id, int size)
 
 static int acp_dma_open(struct snd_soc_component *component, struct snd_pcm_substream *substream)
 {
-	struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream);
-	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct device *dev = component->dev;
 	struct acp_dev_data *adata = dev_get_drvdata(dev);
 	struct acp_stream *stream;
-	int stream_id = cpu_dai->driver->id * 2 + substream->stream;
 	int ret;
 
 	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
@@ -188,7 +183,8 @@ static int acp_dma_open(struct snd_soc_component *component, struct snd_pcm_subs
 		return -ENOMEM;
 
 	stream->substream = substream;
-	adata->stream[stream_id] = stream;
+
+	list_add_tail(&stream->list, &adata->stream_list);
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		runtime->hw = acp_pcm_hardware_playback;
@@ -212,16 +208,13 @@ static int acp_dma_hw_params(struct snd_soc_component *component,
 			     struct snd_pcm_substream *substream,
 			     struct snd_pcm_hw_params *params)
 {
-	struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream);
 	struct acp_dev_data *adata = snd_soc_component_get_drvdata(component);
-	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0);
 	struct acp_stream *stream = substream->runtime->private_data;
-	int stream_id = cpu_dai->driver->id * 2 + substream->stream;
 	u64 size = params_buffer_bytes(params);
 
 	/* Configure ACP DMA block with params */
 	config_pte_for_stream(adata, stream);
-	config_acp_dma(adata, stream_id, size);
+	config_acp_dma(adata, stream, size);
 
 	return 0;
 }
@@ -261,16 +254,11 @@ static int acp_dma_new(struct snd_soc_component *component,
 static int acp_dma_close(struct snd_soc_component *component,
 			 struct snd_pcm_substream *substream)
 {
-	struct snd_soc_pcm_runtime *soc_runtime = asoc_substream_to_rtd(substream);
-	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(soc_runtime, 0);
-	struct device *dev = component->dev;
-	struct acp_dev_data *adata = dev_get_drvdata(dev);
-	struct acp_stream *stream;
-	int stream_id = cpu_dai->driver->id * 2 + substream->stream;
+	struct acp_stream *stream = substream->runtime->private_data;
 
-	stream = adata->stream[stream_id];
+	/* Remove entry from list */
+	list_del(&stream->list);
 	kfree(stream);
-	adata->stream[stream_id] = NULL;
 
 	return 0;
 }
@@ -305,6 +293,9 @@ int acp_platform_register(struct device *dev)
 		dev_err(dev, "Fail to register acp i2s component\n");
 		return status;
 	}
+
+	INIT_LIST_HEAD(&adata->stream_list);
+
 	return 0;
 }
 EXPORT_SYMBOL_NS_GPL(acp_platform_register, SND_SOC_ACP_COMMON);
diff --git a/sound/soc/amd/acp/amd.h b/sound/soc/amd/acp/amd.h
index af9603724a68..148a9ab6206d 100644
--- a/sound/soc/amd/acp/amd.h
+++ b/sound/soc/amd/acp/amd.h
@@ -91,6 +91,7 @@ struct acp_chip_info {
 };
 
 struct acp_stream {
+	struct list_head list;
 	struct snd_pcm_substream *substream;
 	int irq_bit;
 	int dai_id;
@@ -123,7 +124,7 @@ struct acp_dev_data {
 	struct snd_soc_dai_driver *dai_driver;
 	int num_dai;
 
-	struct acp_stream *stream[ACP_MAX_STREAM];
+	struct list_head stream_list;
 
 	struct snd_soc_acpi_mach *machines;
 	struct platform_device *mach_dev;
-- 
2.25.1