[PATCH 09/19] ASoC: amd: ps: add support for Soundwire DMA interrupts

From: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
To: <broonie@kernel.org>, <vkoul@kernel.org>, <alsa-devel@alsa-project.org>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Mastan.Katragadda@amd.com, Sunil-kumar.Dommati@amd.com,
	open list <linux-kernel@vger.kernel.org>,
	Basavaraj.Hiregoudar@amd.com, Takashi Iwai <tiwai@suse.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Mario.Limonciello@amd.com,
	Vijendar Mukunda <Vijendar.Mukunda@amd.com>,
	arungopal.kondaveeti@amd.com,
	Syed Saba Kareem <Syed.SabaKareem@amd.com>
Subject: [PATCH 09/19] ASoC: amd: ps: add support for Soundwire DMA interrupts
Date: Wed, 11 Jan 2023 14:32:12 +0530	[thread overview]
Message-ID: <20230111090222.2016499-10-Vijendar.Mukunda@amd.com> (raw)
In-Reply-To: <20230111090222.2016499-1-Vijendar.Mukunda@amd.com>

Initialize workqueue for DMA interrupts handling.
Whenever audio data equal to the Soundwire FIFO watermark level are
produced/consumed, interrupt is generated.
Acknowledge the interrupt and schedule the workqueue.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
---
 sound/soc/amd/ps/acp63.h  |  2 +
 sound/soc/amd/ps/pci-ps.c | 81 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 82 insertions(+), 1 deletion(-)

diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
index 8963cfb6120d..833d0b5aa73d 100644
--- a/sound/soc/amd/ps/acp63.h
+++ b/sound/soc/amd/ps/acp63.h
@@ -167,9 +167,11 @@ struct acp63_dev_data {
 	struct platform_device *pdev[ACP63_DEVS];
 	struct mutex acp_lock; /* protect shared registers */
 	struct fwnode_handle *sdw_fw_node;
+	struct work_struct acp_sdw_dma_work;
 	u16 pdev_mask;
 	u16 pdev_count;
 	u16 pdm_dev_index;
+	u16 dma_intr_stat[ACP63_SDW_MAX_STREAMS];
 	u8 sdw_master_count;
 	u16 sdw0_dev_index;
 	u16 sdw1_dev_index;
diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
index 0fbe5e27f3fb..5b82ee8e3ad8 100644
--- a/sound/soc/amd/ps/pci-ps.c
+++ b/sound/soc/amd/ps/pci-ps.c
@@ -113,14 +113,37 @@ static int acp63_deinit(void __iomem *acp_base, struct device *dev)
 	return 0;
 }
 
+static void acp63_sdw_dma_workthread(struct work_struct *work)
+{
+	struct acp63_dev_data *adata = container_of(work, struct acp63_dev_data,
+						    acp_sdw_dma_work);
+	struct sdw_dma_dev_data *sdw_dma_data;
+	u32 stream_index;
+	u16 pdev_index;
+
+	pdev_index = adata->sdw_dma_dev_index;
+	sdw_dma_data = dev_get_drvdata(&adata->pdev[pdev_index]->dev);
+
+	for (stream_index = 0; stream_index < ACP63_SDW_MAX_STREAMS; stream_index++) {
+		if (adata->dma_intr_stat[stream_index]) {
+			if (sdw_dma_data->sdw_stream[stream_index])
+				snd_pcm_period_elapsed(sdw_dma_data->sdw_stream[stream_index]);
+			adata->dma_intr_stat[stream_index] = 0;
+		}
+	}
+}
+
 static irqreturn_t acp63_irq_handler(int irq, void *dev_id)
 {
 	struct acp63_dev_data *adata;
 	struct pdm_dev_data *ps_pdm_data;
 	struct amd_sdwc_ctrl *ctrl;
 	u32 ext_intr_stat, ext_intr_stat1;
+	u32 stream_id = 0;
 	u16 irq_flag = 0;
+	u16 sdw_dma_irq_flag = 0;
 	u16 pdev_index;
+	u16 index;
 
 	adata = dev_id;
 	if (!adata)
@@ -159,7 +182,58 @@ static irqreturn_t acp63_irq_handler(int irq, void *dev_id)
 			snd_pcm_period_elapsed(ps_pdm_data->capture_stream);
 		irq_flag = 1;
 	}
-	if (irq_flag)
+	if (ext_intr_stat & ACP_SDW_DMA_IRQ_MASK) {
+		for (index = ACP_HS_RX_THRESHOLD; index <= ACP_AUDIO_TX_THRESHOLD; index++) {
+			if (ext_intr_stat & BIT(index)) {
+				acp63_writel(BIT(index),
+					     adata->acp63_base + ACP_EXTERNAL_INTR_STAT);
+				switch (index) {
+				case ACP_AUDIO_TX_THRESHOLD:
+					stream_id = ACP_SDW_AUDIO_TX;
+					break;
+				case ACP_BT_TX_THRESHOLD:
+					stream_id = ACP_SDW_BT_TX;
+					break;
+				case ACP_HS_TX_THRESHOLD:
+					stream_id = ACP_SDW_HS_TX;
+					break;
+				case ACP_AUDIO_RX_THRESHOLD:
+					stream_id = ACP_SDW_AUDIO_RX;
+					break;
+				case ACP_BT_RX_THRESHOLD:
+					stream_id = ACP_SDW_BT_RX;
+					break;
+				case ACP_HS_RX_THRESHOLD:
+					stream_id = ACP_SDW_HS_RX;
+					break;
+				}
+
+				adata->dma_intr_stat[stream_id] = 1;
+				sdw_dma_irq_flag = 1;
+			}
+		}
+	}
+
+	/* SDW1 BT RX */
+	if (ext_intr_stat1 & BIT(ACP_P1_BT_RX_THRESHOLD)) {
+		acp63_writel(BIT(ACP_P1_BT_RX_THRESHOLD),
+			     adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
+		adata->dma_intr_stat[ACP_SDW1_BT_RX] = 1;
+		sdw_dma_irq_flag = 1;
+	}
+
+	/* SDW1 BT TX*/
+	if (ext_intr_stat1 & BIT(ACP_P1_BT_TX_THRESHOLD)) {
+		acp63_writel(BIT(ACP_P1_BT_TX_THRESHOLD),
+			     adata->acp63_base + ACP_EXTERNAL_INTR_STAT1);
+		adata->dma_intr_stat[ACP_SDW1_BT_TX] = 1;
+		sdw_dma_irq_flag = 1;
+	}
+
+	if (sdw_dma_irq_flag)
+		schedule_work(&adata->acp_sdw_dma_work);
+
+	if (irq_flag || sdw_dma_irq_flag)
 		return IRQ_HANDLED;
 	else
 		return IRQ_NONE;
@@ -240,6 +314,7 @@ static int get_acp63_device_config(u32 config, struct pci_dev *pci, struct acp63
 	if (sdw_dev) {
 		is_sdw_dev = true;
 		acp_data->sdw_fw_node = acpi_fwnode_handle(sdw_dev);
+		INIT_WORK(&acp_data->acp_sdw_dma_work, acp63_sdw_dma_workthread);
 		ret = sdw_amd_scan_controller(dev);
 		if (ret)
 			return ret;
@@ -612,6 +687,10 @@ static void snd_acp63_remove(struct pci_dev *pci)
 	int ret, index;
 
 	adata = pci_get_drvdata(pci);
+
+	if (adata->pdev_mask & ACP63_SDW_DEV_MASK)
+		cancel_work_sync(&adata->acp_sdw_dma_work);
+
 	for (index = 0; index < adata->pdev_count; index++)
 		platform_device_unregister(adata->pdev[index]);
 	ret = acp63_deinit(adata->acp63_base, &pci->dev);
-- 
2.34.1

