linux-kernel - [PATCH 05/11] ASoC: amd: Interrupt handler changes for ACP3x DMA driver

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Date:   Mon, 12 Nov 2018 11:04:56 +0530
From:   Vijendar Mukunda <Vijendar.Mukunda@....com>
To:     unlisted-recipients:; (no To-header on input)
CC:     <vijendar.mukunda@....com>, <Alexander.Deucher@....com>,
        <Vishnuvardhanrao.Ravulapati@....com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Maruthi Bayyavarapu <maruthi.bayyavarapu@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        "Mark Brown" <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH 05/11] ASoC: amd: Interrupt handler changes for ACP3x DMA driver

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

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@....com>
Tested-by: Ravulapati Vishnu vardhan Rao <Vishnuvardhanrao.Ravulapati@....com>
Signed-off-by: Vijendar Mukunda <vijendar.mukunda@....com>
---
 sound/soc/amd/raven/acp3x-pcm-dma.c | 46 +++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/sound/soc/amd/raven/acp3x-pcm-dma.c b/sound/soc/amd/raven/acp3x-pcm-dma.c
index 3e806f7..94f915a 100644
--- a/sound/soc/amd/raven/acp3x-pcm-dma.c
+++ b/sound/soc/amd/raven/acp3x-pcm-dma.c
@@ -27,6 +27,7 @@
 #define DRV_NAME "acp3x-i2s-audio"
 
 struct i2s_dev_data {
+	unsigned int i2s_irq;
 	void __iomem *acp3x_base;
 	struct snd_pcm_substream *play_stream;
 	struct snd_pcm_substream *capture_stream;
@@ -132,6 +133,38 @@ static int acp3x_deinit(void __iomem *acp3x_base)
 	return 0;
 }
 
+static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
+{
+	u16 play_flag, cap_flag;
+	u32 val;
+	struct i2s_dev_data *rv_i2s_data = dev_id;
+
+	if (!rv_i2s_data)
+		return IRQ_NONE;
+
+	play_flag = 0;
+	cap_flag = 0;
+	val = rv_readl(rv_i2s_data->acp3x_base + mmACP_EXTERNAL_INTR_STAT);
+	if ((val & BIT(BT_TX_THRESHOLD)) && rv_i2s_data->play_stream) {
+		rv_writel(BIT(BT_TX_THRESHOLD), rv_i2s_data->acp3x_base +
+			  mmACP_EXTERNAL_INTR_STAT);
+		snd_pcm_period_elapsed(rv_i2s_data->play_stream);
+		play_flag = 1;
+	}
+
+	if ((val & BIT(BT_RX_THRESHOLD)) && rv_i2s_data->capture_stream) {
+		rv_writel(BIT(BT_RX_THRESHOLD), rv_i2s_data->acp3x_base +
+			  mmACP_EXTERNAL_INTR_STAT);
+		snd_pcm_period_elapsed(rv_i2s_data->capture_stream);
+		cap_flag = 1;
+	}
+
+	if (play_flag | cap_flag)
+		return IRQ_HANDLED;
+	else
+		return IRQ_NONE;
+}
+
 static struct snd_pcm_ops acp3x_dma_ops = {
 	.open = NULL,
 	.close = NULL,
@@ -205,6 +238,13 @@ static int acp3x_audio_probe(struct platform_device *pdev)
 	adata->acp3x_base = devm_ioremap(&pdev->dev, res->start,
 					 resource_size(res));
 
+	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;
 	adata->play_stream = NULL;
 	adata->capture_stream = NULL;
 
@@ -220,6 +260,12 @@ static int acp3x_audio_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "Fail to register acp i2s dai\n");
 		goto dev_err;
 	}
+	status = devm_request_irq(&pdev->dev, adata->i2s_irq, i2s_irq_handler,
+				  irqflags, "ACP3x_I2S_IRQ", adata);
+	if (status) {
+		dev_err(&pdev->dev, "ACP3x I2S IRQ request failed\n");
+		goto dev_err;
+	}
 
 	return 0;
 dev_err:
-- 
2.7.4