linux-kernel - [PATCH v5 06/12] ASoC: amd: irq handler changes for ACP5x PCM dma driver

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Date:   Wed, 21 Jul 2021 23:34:22 +0530
From:   Vijendar Mukunda <Vijendar.Mukunda@....com>
To:     <broonie@...nel.org>, <alsa-devel@...a-project.org>
CC:     <pierre-louis.bossart@...ux.intel.com>,
        <Alexander.Deucher@....com>, <Sunil-kumar.Dommati@....com>,
        <krisman@...labora.com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        "Jaroslav Kysela" <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH v5 06/12] ASoC: amd: irq handler changes for ACP5x PCM dma driver

Whenever audio data equal to the I2S FIFO watermark level are
produced/consumed, interrupt is generated.
Acknowledge the interrupt.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
 sound/soc/amd/vangogh/acp5x-pcm-dma.c | 61 ++++++++++++++++++++++++++-
 sound/soc/amd/vangogh/acp5x.h         |  9 ++++
 2 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/sound/soc/amd/vangogh/acp5x-pcm-dma.c b/sound/soc/amd/vangogh/acp5x-pcm-dma.c
index 60d752adfb81..952d5fd83653 100644
--- a/sound/soc/amd/vangogh/acp5x-pcm-dma.c
+++ b/sound/soc/amd/vangogh/acp5x-pcm-dma.c
@@ -21,10 +21,55 @@ static const struct snd_soc_component_driver acp5x_i2s_component = {
 	.name		= DRV_NAME,
 };
 
+static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
+{
+	struct i2s_dev_data *vg_i2s_data;
+	u16 irq_flag;
+	u32 val;
+
+	vg_i2s_data = dev_id;
+	if (!vg_i2s_data)
+		return IRQ_NONE;
+
+	irq_flag = 0;
+	val = acp_readl(vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
+	if ((val & BIT(HS_TX_THRESHOLD)) && vg_i2s_data->play_stream) {
+		acp_writel(BIT(HS_TX_THRESHOLD), vg_i2s_data->acp5x_base +
+			   ACP_EXTERNAL_INTR_STAT);
+		snd_pcm_period_elapsed(vg_i2s_data->play_stream);
+		irq_flag = 1;
+	}
+	if ((val & BIT(I2S_TX_THRESHOLD)) && vg_i2s_data->i2ssp_play_stream) {
+		acp_writel(BIT(I2S_TX_THRESHOLD),
+			   vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
+		snd_pcm_period_elapsed(vg_i2s_data->i2ssp_play_stream);
+		irq_flag = 1;
+	}
+
+	if ((val & BIT(HS_RX_THRESHOLD)) && vg_i2s_data->capture_stream) {
+		acp_writel(BIT(HS_RX_THRESHOLD), vg_i2s_data->acp5x_base +
+			   ACP_EXTERNAL_INTR_STAT);
+		snd_pcm_period_elapsed(vg_i2s_data->capture_stream);
+		irq_flag = 1;
+	}
+	if ((val & BIT(I2S_RX_THRESHOLD)) && vg_i2s_data->i2ssp_capture_stream) {
+		acp_writel(BIT(I2S_RX_THRESHOLD),
+			   vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
+		snd_pcm_period_elapsed(vg_i2s_data->i2ssp_capture_stream);
+		irq_flag = 1;
+	}
+
+	if (irq_flag)
+		return IRQ_HANDLED;
+	else
+		return IRQ_NONE;
+}
+
 static int acp5x_audio_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	struct i2s_dev_data *adata;
+	unsigned int irqflags;
 	int status;
 
 	if (!pdev->dev.platform_data) {
@@ -47,12 +92,26 @@ static int acp5x_audio_probe(struct platform_device *pdev)
 					 resource_size(res));
 	if (!adata->acp5x_base)
 		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
+		return -ENODEV;
+	}
+
+	adata->i2s_irq = res->start;
 	dev_set_drvdata(&pdev->dev, adata);
 	status = devm_snd_soc_register_component(&pdev->dev,
 						 &acp5x_i2s_component,
 						 NULL, 0);
-	if (status)
+	if (status) {
 		dev_err(&pdev->dev, "Fail to register acp i2s component\n");
+		return status;
+	}
+	status = devm_request_irq(&pdev->dev, adata->i2s_irq, i2s_irq_handler,
+				  irqflags, "ACP5x_I2S_IRQ", adata);
+	if (status)
+		dev_err(&pdev->dev, "ACP5x I2S IRQ request failed\n");
 
 	return status;
 }
diff --git a/sound/soc/amd/vangogh/acp5x.h b/sound/soc/amd/vangogh/acp5x.h
index e450fb32d680..a0d898e47bb8 100644
--- a/sound/soc/amd/vangogh/acp5x.h
+++ b/sound/soc/amd/vangogh/acp5x.h
@@ -32,9 +32,18 @@
 #define I2S_MODE 0
 #define ACP5x_I2S_MODE 1
 #define ACP5x_RES 4
+#define	I2S_RX_THRESHOLD 27
+#define	I2S_TX_THRESHOLD 28
+#define	HS_TX_THRESHOLD 24
+#define	HS_RX_THRESHOLD 23
 
 struct i2s_dev_data {
+	unsigned int i2s_irq;
 	void __iomem *acp5x_base;
+	struct snd_pcm_substream *play_stream;
+	struct snd_pcm_substream *capture_stream;
+	struct snd_pcm_substream *i2ssp_play_stream;
+	struct snd_pcm_substream *i2ssp_capture_stream;
 };
 
 /* common header file uses exact offset rather than relative
-- 
2.17.1