linux-kernel - [PATCH V4 2/9] ASoC: amd: ps: handle SoundWire interrupts in acp pci driver

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Message-ID: <20230612095903.2113464-3-Vijendar.Mukunda@amd.com>
Date:   Mon, 12 Jun 2023 15:28:56 +0530
From:   Vijendar Mukunda <Vijendar.Mukunda@....com>
To:     <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>,
        <pierre-louis.bossart@...ux.intel.com>,
        <Basavaraj.Hiregoudar@....com>, <Sunil-kumar.Dommati@....com>,
        <Mastan.Katragadda@....com>, <Arungopal.kondaveeti@....com>,
        <mario.limonciello@....com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Syed Saba Kareem <Syed.SabaKareem@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH V4 2/9] ASoC: amd: ps: handle SoundWire interrupts in acp pci driver

Handle SoundWire manager related interrupts in ACP PCI driver
interrupt handler and schedule SoundWire manager work queue for
further processing.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
 sound/soc/amd/ps/acp63.h  |  3 +++
 sound/soc/amd/ps/pci-ps.c | 48 +++++++++++++++++++++++++++++++++++----
 2 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
index 80ab542529a7..494f498bdc91 100644
--- a/sound/soc/amd/ps/acp63.h
+++ b/sound/soc/amd/ps/acp63.h
@@ -99,6 +99,9 @@
  * manager instance combination.
  */
 #define ACP63_SDW_PDM_DEV_CONFIG	GENMASK(1, 0)
+#define ACP_SDW0_STAT			BIT(21)
+#define ACP_SDW1_STAT			BIT(2)
+#define ACP_ERROR_IRQ			BIT(29)
 
 enum acp_config {
 	ACP_CONFIG_0 = 0,
diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
index cf57ad2d7ccc..ac82dbe13351 100644
--- a/sound/soc/amd/ps/pci-ps.c
+++ b/sound/soc/amd/ps/pci-ps.c
@@ -56,6 +56,7 @@ static int acp63_reset(void __iomem *acp_base)
 static void acp63_enable_interrupts(void __iomem *acp_base)
 {
 	writel(1, acp_base + ACP_EXTERNAL_INTR_ENB);
+	writel(ACP_ERROR_IRQ, acp_base + ACP_EXTERNAL_INTR_CNTL);
 }
 
 static void acp63_disable_interrupts(void __iomem *acp_base)
@@ -102,23 +103,60 @@ static irqreturn_t acp63_irq_handler(int irq, void *dev_id)
 {
 	struct acp63_dev_data *adata;
 	struct pdm_dev_data *ps_pdm_data;
-	u32 val;
+	struct amd_sdw_manager *amd_manager;
+	u32 ext_intr_stat, ext_intr_stat1;
+	u16 irq_flag = 0;
 	u16 pdev_index;
 
 	adata = dev_id;
 	if (!adata)
 		return IRQ_NONE;
+	/* ACP interrupts will be cleared by reading particular bit and writing
+	 * same value to the status register. writing zero's doesn't have any
+	 * effect.
+	 * Bit by bit checking of IRQ field is implemented.
+	 */
+	ext_intr_stat = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
+	if (ext_intr_stat & ACP_SDW0_STAT) {
+		writel(ACP_SDW0_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
+		pdev_index = adata->sdw0_dev_index;
+		amd_manager = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
+		if (amd_manager)
+			schedule_work(&amd_manager->amd_sdw_irq_thread);
+		irq_flag = 1;
+	}
+
+	ext_intr_stat1 = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
+	if (ext_intr_stat1 & ACP_SDW1_STAT) {
+		writel(ACP_SDW1_STAT, adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
+		pdev_index = adata->sdw1_dev_index;
+		amd_manager = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
+		if (amd_manager)
+			schedule_work(&amd_manager->amd_sdw_irq_thread);
+		irq_flag = 1;
+	}
 
-	val = readl(adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
-	if (val & BIT(PDM_DMA_STAT)) {
+	if (ext_intr_stat & ACP_ERROR_IRQ) {
+		writel(ACP_ERROR_IRQ, adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
+		/* TODO: Report SoundWire Manager instance errors */
+		writel(0, adata->acp63_base + ACP_SW0_I2S_ERROR_REASON);
+		writel(0, adata->acp63_base + ACP_SW1_I2S_ERROR_REASON);
+		writel(0, adata->acp63_base + ACP_ERROR_STATUS);
+		irq_flag = 1;
+	}
+
+	if (ext_intr_stat & BIT(PDM_DMA_STAT)) {
 		pdev_index = adata->pdm_dev_index;
 		ps_pdm_data = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
 		writel(BIT(PDM_DMA_STAT), adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
 		if (ps_pdm_data->capture_stream)
 			snd_pcm_period_elapsed(ps_pdm_data->capture_stream);
-		return IRQ_HANDLED;
+		irq_flag = 1;
 	}
-	return IRQ_NONE;
+	if (irq_flag)
+		return IRQ_HANDLED;
+	else
+		return IRQ_NONE;
 }
 
 static int sdw_amd_scan_controller(struct device *dev)
-- 
2.34.1