[PATCH 1/4] ASoC: AMD: disabling memory gating in stoney platform

[Alex Deucher <alexdeucher@gmail.com>]

From: Vijendar Mukunda <Vijendar.Mukunda@amd.com>

For Stoney platform, Memory gating is disabled.i.e SRAM Banks
won't be turned off. By Default, SRAM Bank state set to ON.
Added condition checks to skip SRAM Bank state set logic for
Stoney platform.

Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

v2: Added comments in code and removed locally defined macros
    for STONEY and Carrizo.
v3: add R-b, resend
v4: add Mark's Ack

 sound/soc/amd/acp-pcm-dma.c | 79 +++++++++++++++++++++++++++++++--------------
 1 file changed, 55 insertions(+), 24 deletions(-)

diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
index dcbf997..f00b6b9 100644
--- a/sound/soc/amd/acp-pcm-dma.c
+++ b/sound/soc/amd/acp-pcm-dma.c
@@ -20,7 +20,7 @@
 #include <linux/pm_runtime.h>
 
 #include <sound/soc.h>
-
+#include <drm/amd_asic_type.h>
 #include "acp.h"
 
 #define PLAYBACK_MIN_NUM_PERIODS    2
@@ -419,7 +419,7 @@ static void acp_set_sram_bank_state(void __iomem *acp_mmio, u16 bank,
 }
 
 /* Initialize and bring ACP hardware to default state. */
-static int acp_init(void __iomem *acp_mmio)
+static int acp_init(void __iomem *acp_mmio, u32 asic_type)
 {
 	u16 bank;
 	u32 val, count, sram_pte_offset;
@@ -493,9 +493,14 @@ static int acp_init(void __iomem *acp_mmio)
        /* 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 Stoney, Memory gating is disabled,i.e SRAM Banks
+	* won't be turned off. The default state for SRAM banks is ON.
+	* Setting SRAM bank state code skipped for STONEY platform.
 	*/
-	for (bank = 1; bank < 48; bank++)
-		acp_set_sram_bank_state(acp_mmio, bank, false);
+	if (asic_type != CHIP_STONEY) {
+		for (bank = 1; bank < 48; bank++)
+			acp_set_sram_bank_state(acp_mmio, bank, false);
+	}
 
 	return 0;
 }
@@ -646,14 +651,22 @@ static int acp_dma_open(struct snd_pcm_substream *substream)
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		intr_data->play_stream = substream;
-		for (bank = 1; bank <= 4; bank++)
-			acp_set_sram_bank_state(intr_data->acp_mmio, bank,
-						true);
+		/* For Stoney, Memory gating is disabled,i.e SRAM Banks
+		 * won't be turned off. The default state for SRAM banks is ON.
+		 * Setting SRAM bank state code skipped for STONEY platform.
+		 */
+		if (intr_data->asic_type != CHIP_STONEY) {
+			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);
+		if (intr_data->asic_type != CHIP_STONEY) {
+			for (bank = 5; bank <= 8; bank++)
+				acp_set_sram_bank_state(intr_data->acp_mmio,
+							bank, true);
+		}
 	}
 
 	return 0;
@@ -869,14 +882,23 @@ static int acp_dma_close(struct snd_pcm_substream *substream)
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		adata->play_stream = NULL;
-		for (bank = 1; bank <= 4; bank++)
-			acp_set_sram_bank_state(adata->acp_mmio, bank,
-						false);
-	} else {
+		/* For Stoney, Memory gating is disabled,i.e SRAM Banks
+		 * won't be turned off. The default state for SRAM banks is ON.
+		 * Setting SRAM bank state code skipped for STONEY platform.
+		 * added condition checks for Carrizo platform only
+		 */
+		if (adata->asic_type != CHIP_STONEY) {
+			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);
+		if (adata->asic_type != CHIP_STONEY) {
+			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
@@ -945,7 +967,7 @@ static int acp_audio_probe(struct platform_device *pdev)
 	dev_set_drvdata(&pdev->dev, audio_drv_data);
 
 	/* Initialize the ACP */
-	acp_init(audio_drv_data->acp_mmio);
+	acp_init(audio_drv_data->acp_mmio, audio_drv_data->asic_type);
 
 	status = snd_soc_register_platform(&pdev->dev, &acp_asoc_platform);
 	if (status != 0) {
@@ -976,19 +998,27 @@ static int acp_pcm_resume(struct device *dev)
 	u16 bank;
 	struct audio_drv_data *adata = dev_get_drvdata(dev);
 
-	acp_init(adata->acp_mmio);
+	acp_init(adata->acp_mmio, adata->asic_type);
 
 	if (adata->play_stream && adata->play_stream->runtime) {
-		for (bank = 1; bank <= 4; bank++)
-			acp_set_sram_bank_state(adata->acp_mmio, bank,
+		/* For Stoney, Memory gating is disabled,i.e SRAM Banks
+		 * won't be turned off. The default state for SRAM banks is ON.
+		 * Setting SRAM bank state code skipped for STONEY platform.
+		 */
+		if (adata->asic_type != CHIP_STONEY) {
+			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) {
-		for (bank = 5; bank <= 8; bank++)
-			acp_set_sram_bank_state(adata->acp_mmio, bank,
+		if (adata->asic_type != CHIP_STONEY) {
+			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);
 	}
@@ -1009,7 +1039,7 @@ static int acp_pcm_runtime_resume(struct device *dev)
 {
 	struct audio_drv_data *adata = dev_get_drvdata(dev);
 
-	acp_init(adata->acp_mmio);
+	acp_init(adata->acp_mmio, adata->asic_type);
 	acp_reg_write(1, adata->acp_mmio, mmACP_EXTERNAL_INTR_ENB);
 	return 0;
 }
@@ -1031,6 +1061,7 @@ static struct platform_driver acp_dma_driver = {
 
 module_platform_driver(acp_dma_driver);
 
+MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
 MODULE_AUTHOR("Maruthi.Bayyavarapu@amd.com");
 MODULE_DESCRIPTION("AMD ACP PCM Driver");
 MODULE_LICENSE("GPL v2");
-- 
2.5.5

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