Applied "ASoC: AMD: Manage ACP 2.x SRAM banks power" to the asoc tree

[Mark Brown <broonie@kernel.org>]

The patch

   ASoC: AMD: Manage ACP 2.x SRAM banks power

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From c36d9b3f6de7c6aefed5fdf6ad752773bdafa60c Mon Sep 17 00:00:00 2001
From: Maruthi Srinivas Bayyavarapu <Maruthi.Bayyavarapu@amd.com>
Date: Fri, 8 Jan 2016 18:22:11 -0500
Subject: [PATCH] ASoC: AMD: Manage ACP 2.x SRAM banks power

ACP SRAM banks gets turned on when ACP is powered on.
Not all banks are used for playback/capture. So, power on
required banks during audio device open and power off during
audio device close.

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/amd/acp-pcm-dma.c | 94 +++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 87 insertions(+), 7 deletions(-)

diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
index c0819b5f8ba5..cc8b841b69b6 100644
--- a/sound/soc/amd/acp-pcm-dma.c
+++ b/sound/soc/amd/acp-pcm-dma.c
@@ -376,9 +376,57 @@ static int acp_dma_stop(void __iomem *acp_mmio, u8 ch_num)
 	return 0;
 }
 
+static void acp_set_sram_bank_state(void __iomem *acp_mmio, u16 bank,
+					bool power_on)
+{
+	u32 val, req_reg, sts_reg, sts_reg_mask;
+	u32 loops = 1000;
+
+	if (bank < 32) {
+		req_reg = mmACP_MEM_SHUT_DOWN_REQ_LO;
+		sts_reg = mmACP_MEM_SHUT_DOWN_STS_LO;
+		sts_reg_mask = 0xFFFFFFFF;
+
+	} else {
+		bank -= 32;
+		req_reg = mmACP_MEM_SHUT_DOWN_REQ_HI;
+		sts_reg = mmACP_MEM_SHUT_DOWN_STS_HI;
+		sts_reg_mask = 0x0000FFFF;
+	}
+
+	val = acp_reg_read(acp_mmio, req_reg);
+	if (val & (1 << bank)) {
+		/* bank is in off state */
+		if (power_on == true)
+			/* request to on */
+			val &= ~(1 << bank);
+		else
+			/* request to off */
+			return;
+	} else {
+		/* bank is in on state */
+		if (power_on == false)
+			/* request to off */
+			val |= 1 << bank;
+		else
+			/* request to on */
+			return;
+	}
+	acp_reg_write(val, acp_mmio, req_reg);
+
+	while (acp_reg_read(acp_mmio, sts_reg) != sts_reg_mask) {
+		if (!loops--) {
+			pr_err("ACP SRAM bank %d state change failed\n", bank);
+			break;
+		}
+		cpu_relax();
+	}
+}
+
 /* Initialize and bring ACP hardware to default state. */
 static int acp_init(void __iomem *acp_mmio)
 {
+	u16 bank;
 	u32 val, count, sram_pte_offset;
 
 	/* Assert Soft reset of ACP */
@@ -447,6 +495,13 @@ static int acp_init(void __iomem *acp_mmio)
 	acp_reg_write(ACP_EXTERNAL_INTR_CNTL__DMAIOCMask_MASK,
 		acp_mmio, mmACP_EXTERNAL_INTR_CNTL);
 
+       /* When ACP_TILE_P1 is turned on, all SRAM banks get turned on.
+	* Now, turn off all of them. This can't be done in 'poweron' of
+	* ACP pm domain, as this requires ACP to be initialized.
+	*/
+	for (bank = 1; bank < 48; bank++)
+		acp_set_sram_bank_state(acp_mmio, bank, false);
+
 	return 0;
 }
 
@@ -559,6 +614,7 @@ static irqreturn_t dma_irq_handler(int irq, void *arg)
 
 static int acp_dma_open(struct snd_pcm_substream *substream)
 {
+	u16 bank;
 	int ret = 0;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *prtd = substream->private_data;
@@ -592,10 +648,17 @@ static int acp_dma_open(struct snd_pcm_substream *substream)
 	if (!intr_data->play_stream && !intr_data->capture_stream)
 		acp_reg_write(1, adata->acp_mmio, mmACP_EXTERNAL_INTR_ENB);
 
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		intr_data->play_stream = substream;
-	else
+		for (bank = 1; bank <= 4; bank++)
+			acp_set_sram_bank_state(intr_data->acp_mmio, bank,
+						true);
+	} else {
 		intr_data->capture_stream = substream;
+		for (bank = 5; bank <= 8; bank++)
+			acp_set_sram_bank_state(intr_data->acp_mmio, bank,
+						true);
+	}
 
 	return 0;
 }
@@ -627,6 +690,7 @@ static int acp_dma_hw_params(struct snd_pcm_substream *substream,
 	pg = virt_to_page(substream->dma_buffer.area);
 
 	if (pg != NULL) {
+		acp_set_sram_bank_state(rtd->acp_mmio, 0, true);
 		/* Save for runtime private data */
 		rtd->pg = pg;
 		rtd->order = get_order(size);
@@ -802,6 +866,7 @@ static int acp_dma_new(struct snd_soc_pcm_runtime *rtd)
 
 static int acp_dma_close(struct snd_pcm_substream *substream)
 {
+	u16 bank;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct audio_substream_data *rtd = runtime->private_data;
 	struct snd_soc_pcm_runtime *prtd = substream->private_data;
@@ -809,10 +874,17 @@ static int acp_dma_close(struct snd_pcm_substream *substream)
 
 	kfree(rtd);
 
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		adata->play_stream = NULL;
-	else
+		for (bank = 1; bank <= 4; bank++)
+			acp_set_sram_bank_state(adata->acp_mmio, bank,
+						false);
+	} else {
 		adata->capture_stream = NULL;
+		for (bank = 5; bank <= 8; bank++)
+			acp_set_sram_bank_state(adata->acp_mmio, bank,
+						false);
+	}
 
 	/* Disable ACP irq, when the current stream is being closed and
 	 * another stream is also not active.
@@ -906,17 +978,25 @@ static int acp_audio_remove(struct platform_device *pdev)
 
 static int acp_pcm_resume(struct device *dev)
 {
+	u16 bank;
 	struct audio_drv_data *adata = dev_get_drvdata(dev);
 
 	acp_init(adata->acp_mmio);
 
-	if (adata->play_stream && adata->play_stream->runtime)
+	if (adata->play_stream && adata->play_stream->runtime) {
+		for (bank = 1; bank <= 4; bank++)
+			acp_set_sram_bank_state(adata->acp_mmio, bank,
+						true);
 		config_acp_dma(adata->acp_mmio,
 				adata->play_stream->runtime->private_data);
-	if (adata->capture_stream && adata->capture_stream->runtime)
+	}
+	if (adata->capture_stream && adata->capture_stream->runtime) {
+		for (bank = 5; bank <= 8; bank++)
+			acp_set_sram_bank_state(adata->acp_mmio, bank,
+						true);
 		config_acp_dma(adata->acp_mmio,
 				adata->capture_stream->runtime->private_data);
-
+	}
 	acp_reg_write(1, adata->acp_mmio, mmACP_EXTERNAL_INTR_ENB);
 	return 0;
 }
-- 
2.7.0.rc3