From: Maruthi Srinivas Bayyavarapu Maruthi.Bayyavarapu@amd.com
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 ---
v2: Changes: 1. Clean up sram bank handling to clarify operation 2. Add timeout to loop
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 c0819b5..cc8b841 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; }