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From:   Syed Saba Kareem <Syed.SabaKareem@amd.com>
To:     <broonie@kernel.org>, <alsa-devel@alsa-project.org>
CC:     <Vijendar.Mukunda@amd.com>, <Basavaraj.Hiregoudar@amd.com>,
        <Sunil-kumar.Dommati@amd.com>,
        Syed Saba Kareem <Syed.SabaKareem@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>,
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        Venkata Prasad Potturu <venkataprasad.potturu@amd.com>,
        Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 11/11] ASoC: amd: acp: add pm ops support for rembrandt platform
Date:   Thu, 22 Jun 2023 20:53:58 +0530
Message-ID: <20230622152406.3709231-21-Syed.SabaKareem@amd.com>
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Add pm ops for rembrandt platform.

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@amd.com>
---
 sound/soc/amd/acp/acp-legacy-common.c | 208 ++++++++++++++++++++++++++
 sound/soc/amd/acp/acp-rembrandt.c     |  42 +++++-
 sound/soc/amd/acp/amd.h               |   9 ++
 3 files changed, 258 insertions(+), 1 deletion(-)

diff --git a/sound/soc/amd/acp/acp-legacy-common.c b/sound/soc/amd/acp/acp-legacy-common.c
index 45a45d002915..ba58165cc6e6 100644
--- a/sound/soc/amd/acp/acp-legacy-common.c
+++ b/sound/soc/amd/acp/acp-legacy-common.c
@@ -37,6 +37,214 @@ void acp_disable_interrupts(struct acp_dev_data *adata)
 }
 EXPORT_SYMBOL_NS_GPL(acp_disable_interrupts, SND_SOC_ACP_COMMON);
 
+static void set_acp_pdm_ring_buffer(struct snd_pcm_substream *substream,
+				    struct snd_soc_dai *dai)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct acp_stream *stream = runtime->private_data;
+	struct device *dev = dai->component->dev;
+	struct acp_dev_data *adata = dev_get_drvdata(dev);
+
+	u32 physical_addr, pdm_size, period_bytes;
+
+	period_bytes = frames_to_bytes(runtime, runtime->period_size);
+	pdm_size = frames_to_bytes(runtime, runtime->buffer_size);
+	physical_addr = stream->reg_offset + MEM_WINDOW_START;
+
+	/* Init ACP PDM Ring buffer */
+	writel(physical_addr, adata->acp_base + ACP_WOV_RX_RINGBUFADDR);
+	writel(pdm_size, adata->acp_base + ACP_WOV_RX_RINGBUFSIZE);
+	writel(period_bytes, adata->acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
+	writel(0x01, adata->acp_base + ACPAXI2AXI_ATU_CTRL);
+}
+
+static void set_acp_pdm_clk(struct snd_pcm_substream *substream,
+			    struct snd_soc_dai *dai)
+{
+	struct device *dev = dai->component->dev;
+	struct acp_dev_data *adata = dev_get_drvdata(dev);
+	unsigned int pdm_ctrl;
+
+	/* Enable default ACP PDM clk */
+	writel(PDM_CLK_FREQ_MASK, adata->acp_base + ACP_WOV_CLK_CTRL);
+	pdm_ctrl = readl(adata->acp_base + ACP_WOV_MISC_CTRL);
+	pdm_ctrl |= PDM_MISC_CTRL_MASK;
+	writel(pdm_ctrl, adata->acp_base + ACP_WOV_MISC_CTRL);
+	set_acp_pdm_ring_buffer(substream, dai);
+}
+
+void restore_acp_pdm_params(struct snd_pcm_substream *substream,
+			    struct acp_dev_data *adata)
+{
+	struct snd_soc_dai *dai;
+	struct snd_soc_pcm_runtime *soc_runtime;
+	u32 ext_int_ctrl;
+
+	soc_runtime = asoc_substream_to_rtd(substream);
+	dai = asoc_rtd_to_cpu(soc_runtime, 0);
+	/* Programming channel mask and sampling rate */
+	writel(adata->ch_mask, adata->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);
+	writel(PDM_DEC_64, adata->acp_base + ACP_WOV_PDM_DECIMATION_FACTOR);
+
+	/* Enabling ACP Pdm interuppts */
+	ext_int_ctrl = readl(ACP_EXTERNAL_INTR_CNTL(adata, 0));
+	ext_int_ctrl |= PDM_DMA_INTR_MASK;
+	writel(ext_int_ctrl, ACP_EXTERNAL_INTR_CNTL(adata, 0));
+	set_acp_pdm_clk(substream, dai);
+}
+EXPORT_SYMBOL_NS_GPL(restore_acp_pdm_params, SND_SOC_ACP_COMMON);
+
+static int set_acp_i2s_dma_fifo(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct device *dev = dai->component->dev;
+	struct acp_dev_data *adata = dev_get_drvdata(dev);
+	struct acp_resource *rsrc = adata->rsrc;
+	struct acp_stream *stream = substream->runtime->private_data;
+	u32 reg_dma_size, reg_fifo_size, reg_fifo_addr;
+	u32 phy_addr, acp_fifo_addr, ext_int_ctrl;
+	unsigned int dir = substream->stream;
+
+	switch (dai->driver->id) {
+	case I2S_SP_INSTANCE:
+		if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
+			reg_dma_size = ACP_I2S_TX_DMA_SIZE;
+			acp_fifo_addr = rsrc->sram_pte_offset +
+					SP_PB_FIFO_ADDR_OFFSET;
+			reg_fifo_addr = ACP_I2S_TX_FIFOADDR;
+			reg_fifo_size = ACP_I2S_TX_FIFOSIZE;
+			phy_addr = I2S_SP_TX_MEM_WINDOW_START + stream->reg_offset;
+			writel(phy_addr, adata->acp_base + ACP_I2S_TX_RINGBUFADDR);
+		} else {
+			reg_dma_size = ACP_I2S_RX_DMA_SIZE;
+			acp_fifo_addr = rsrc->sram_pte_offset +
+					SP_CAPT_FIFO_ADDR_OFFSET;
+			reg_fifo_addr = ACP_I2S_RX_FIFOADDR;
+			reg_fifo_size = ACP_I2S_RX_FIFOSIZE;
+			phy_addr = I2S_SP_RX_MEM_WINDOW_START + stream->reg_offset;
+			writel(phy_addr, adata->acp_base + ACP_I2S_RX_RINGBUFADDR);
+		}
+		break;
+	case I2S_BT_INSTANCE:
+		if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
+			reg_dma_size = ACP_BT_TX_DMA_SIZE;
+			acp_fifo_addr = rsrc->sram_pte_offset +
+					BT_PB_FIFO_ADDR_OFFSET;
+			reg_fifo_addr = ACP_BT_TX_FIFOADDR;
+			reg_fifo_size = ACP_BT_TX_FIFOSIZE;
+			phy_addr = I2S_BT_TX_MEM_WINDOW_START + stream->reg_offset;
+			writel(phy_addr, adata->acp_base + ACP_BT_TX_RINGBUFADDR);
+		} else {
+			reg_dma_size = ACP_BT_RX_DMA_SIZE;
+			acp_fifo_addr = rsrc->sram_pte_offset +
+					BT_CAPT_FIFO_ADDR_OFFSET;
+			reg_fifo_addr = ACP_BT_RX_FIFOADDR;
+			reg_fifo_size = ACP_BT_RX_FIFOSIZE;
+			phy_addr = I2S_BT_TX_MEM_WINDOW_START + stream->reg_offset;
+			writel(phy_addr, adata->acp_base + ACP_BT_RX_RINGBUFADDR);
+		}
+		break;
+	case I2S_HS_INSTANCE:
+		if (dir == SNDRV_PCM_STREAM_PLAYBACK) {
+			reg_dma_size = ACP_HS_TX_DMA_SIZE;
+			acp_fifo_addr = rsrc->sram_pte_offset +
+					HS_PB_FIFO_ADDR_OFFSET;
+			reg_fifo_addr = ACP_HS_TX_FIFOADDR;
+			reg_fifo_size = ACP_HS_TX_FIFOSIZE;
+			phy_addr = I2S_HS_TX_MEM_WINDOW_START + stream->reg_offset;
+			writel(phy_addr, adata->acp_base + ACP_HS_TX_RINGBUFADDR);
+		} else {
+			reg_dma_size = ACP_HS_RX_DMA_SIZE;
+			acp_fifo_addr = rsrc->sram_pte_offset +
+					HS_CAPT_FIFO_ADDR_OFFSET;
+			reg_fifo_addr = ACP_HS_RX_FIFOADDR;
+			reg_fifo_size = ACP_HS_RX_FIFOSIZE;
+			phy_addr = I2S_HS_RX_MEM_WINDOW_START + stream->reg_offset;
+			writel(phy_addr, adata->acp_base + ACP_HS_RX_RINGBUFADDR);
+		}
+		break;
+	default:
+		dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
+		return -EINVAL;
+	}
+
+	writel(DMA_SIZE, adata->acp_base + reg_dma_size);
+	writel(acp_fifo_addr, adata->acp_base + reg_fifo_addr);
+	writel(FIFO_SIZE, adata->acp_base + reg_fifo_size);
+
+	ext_int_ctrl = readl(ACP_EXTERNAL_INTR_CNTL(adata, rsrc->irqp_used));
+	ext_int_ctrl |= BIT(I2S_RX_THRESHOLD(rsrc->offset)) |
+			BIT(BT_RX_THRESHOLD(rsrc->offset)) |
+			BIT(I2S_TX_THRESHOLD(rsrc->offset)) |
+			BIT(BT_TX_THRESHOLD(rsrc->offset)) |
+			BIT(HS_RX_THRESHOLD(rsrc->offset)) |
+			BIT(HS_TX_THRESHOLD(rsrc->offset));
+
+	writel(ext_int_ctrl, ACP_EXTERNAL_INTR_CNTL(adata, rsrc->irqp_used));
+	return 0;
+}
+
+int restore_acp_i2s_params(struct snd_pcm_substream *substream,
+			   struct acp_dev_data *adata,
+			   struct acp_stream *stream)
+{
+	struct snd_soc_dai *dai;
+	struct snd_soc_pcm_runtime *soc_runtime;
+	u32 tdm_fmt, reg_val, fmt_reg, val;
+
+	soc_runtime = asoc_substream_to_rtd(substream);
+	dai = asoc_rtd_to_cpu(soc_runtime, 0);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		tdm_fmt = adata->tdm_tx_fmt[stream->dai_id - 1];
+		switch (stream->dai_id) {
+		case I2S_BT_INSTANCE:
+			reg_val = ACP_BTTDM_ITER;
+			fmt_reg = ACP_BTTDM_TXFRMT;
+			break;
+		case I2S_SP_INSTANCE:
+			reg_val = ACP_I2STDM_ITER;
+			fmt_reg = ACP_I2STDM_TXFRMT;
+			break;
+		case I2S_HS_INSTANCE:
+			reg_val = ACP_HSTDM_ITER;
+			fmt_reg = ACP_HSTDM_TXFRMT;
+			break;
+		default:
+			pr_err("Invalid dai id %x\n", stream->dai_id);
+			return -EINVAL;
+		}
+		val = adata->xfer_tx_resolution[stream->dai_id - 1] << 3;
+	} else {
+		tdm_fmt = adata->tdm_rx_fmt[stream->dai_id - 1];
+		switch (stream->dai_id) {
+		case I2S_BT_INSTANCE:
+			reg_val = ACP_BTTDM_IRER;
+			fmt_reg = ACP_BTTDM_RXFRMT;
+			break;
+		case I2S_SP_INSTANCE:
+			reg_val = ACP_I2STDM_IRER;
+			fmt_reg = ACP_I2STDM_RXFRMT;
+			break;
+		case I2S_HS_INSTANCE:
+			reg_val = ACP_HSTDM_IRER;
+			fmt_reg = ACP_HSTDM_RXFRMT;
+			break;
+		default:
+			pr_err("Invalid dai id %x\n", stream->dai_id);
+			return -EINVAL;
+		}
+		val = adata->xfer_rx_resolution[stream->dai_id - 1] << 3;
+	}
+	writel(val, adata->acp_base + reg_val);
+	if (adata->tdm_mode == TDM_ENABLE) {
+		writel(tdm_fmt, adata->acp_base + fmt_reg);
+		val = readl(adata->acp_base + reg_val);
+		writel(val | 0x2, adata->acp_base + reg_val);
+	}
+	return set_acp_i2s_dma_fifo(substream, dai);
+}
+EXPORT_SYMBOL_NS_GPL(restore_acp_i2s_params, SND_SOC_ACP_COMMON);
+
 static int acp_power_on(struct acp_chip_info *chip)
 {
 	u32 val, acp_pgfsm_stat_reg, acp_pgfsm_ctrl_reg;
diff --git a/sound/soc/amd/acp/acp-rembrandt.c b/sound/soc/amd/acp/acp-rembrandt.c
index bc8e1de45170..b2b78a69dc24 100644
--- a/sound/soc/amd/acp/acp-rembrandt.c
+++ b/sound/soc/amd/acp/acp-rembrandt.c
@@ -20,6 +20,7 @@
 #include <sound/soc-dai.h>
 #include <linux/dma-mapping.h>
 #include <linux/pci.h>
+#include <linux/pm_runtime.h>
 
 #include "amd.h"
 
@@ -236,7 +237,11 @@ static int rembrandt_audio_probe(struct platform_device *pdev)
 	acp6x_master_clock_generate(dev);
 	acp_enable_interrupts(adata);
 	acp_platform_register(dev);
-
+	pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
 	return 0;
 }
 
@@ -247,13 +252,48 @@ static void rembrandt_audio_remove(struct platform_device *pdev)
 
 	acp_disable_interrupts(adata);
 	acp_platform_unregister(dev);
+	pm_runtime_disable(&pdev->dev);
+}
+
+static int __maybe_unused rmb_pcm_resume(struct device *dev)
+{
+	struct acp_dev_data *adata = dev_get_drvdata(dev);
+	struct acp_stream *stream;
+	struct snd_pcm_substream *substream;
+	snd_pcm_uframes_t buf_in_frames;
+	u64 buf_size;
+
+	acp6x_master_clock_generate(dev);
+	spin_lock(&adata->acp_lock);
+	list_for_each_entry(stream, &adata->stream_list, list) {
+		if (stream) {
+			substream = stream->substream;
+			if (substream && substream->runtime) {
+				buf_in_frames = (substream->runtime->buffer_size);
+				buf_size = frames_to_bytes(substream->runtime, buf_in_frames);
+				config_pte_for_stream(adata, stream);
+				config_acp_dma(adata, stream, buf_size);
+				if (stream->dai_id)
+					restore_acp_i2s_params(substream, adata, stream);
+				else
+					restore_acp_pdm_params(substream, adata);
+			}
+		}
+	}
+		spin_unlock(&adata->acp_lock);
+		return 0;
 }
 
+static const struct dev_pm_ops rmb_dma_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(NULL, rmb_pcm_resume)
+};
+
 static struct platform_driver rembrandt_driver = {
 	.probe = rembrandt_audio_probe,
 	.remove_new = rembrandt_audio_remove,
 	.driver = {
 		.name = "acp_asoc_rembrandt",
+		.pm = &rmb_dma_pm_ops,
 	},
 };
 
diff --git a/sound/soc/amd/acp/amd.h b/sound/soc/amd/acp/amd.h
index 8dc663c8d98a..1d8457383e3f 100644
--- a/sound/soc/amd/acp/amd.h
+++ b/sound/soc/amd/acp/amd.h
@@ -110,6 +110,7 @@
 
 #define ACP_TIMEOUT		500
 #define DELAY_US		5
+#define ACP_SUSPEND_DELAY_MS   2000
 
 #define PDM_DMA_STAT            0x10
 #define PDM_DMA_INTR_MASK       0x10000
@@ -213,6 +214,14 @@ void acp_disable_interrupts(struct acp_dev_data *adata);
 /* Machine configuration */
 int snd_amd_acp_find_config(struct pci_dev *pci);
 
+void config_pte_for_stream(struct acp_dev_data *adata, struct acp_stream *stream);
+void config_acp_dma(struct acp_dev_data *adata, struct acp_stream *stream, int size);
+void restore_acp_pdm_params(struct snd_pcm_substream *substream,
+			    struct acp_dev_data *adata);
+
+int restore_acp_i2s_params(struct snd_pcm_substream *substream,
+			   struct acp_dev_data *adata, struct acp_stream *stream);
+
 static inline u64 acp_get_byte_count(struct acp_dev_data *adata, int dai_id, int direction)
 {
 	u64 byte_count, low = 0, high = 0;
-- 
2.25.1