Re: [PATCH] ASoC: amd: ps: fix for soundwire failures during hibernation exit sequence

On 21/06/25 15:17, Vijendar Mukunda wrote:

During the hibernate entry sequence, ACP registers will be reset to default values and acp ip will be completely powered off including acp SoundWire pads. During resume sequence, if acp SoundWire pad keeper enable register is not restored along with pad pulldown control register value, then SoundWire manager links won't be powered on correctly results in peripheral register access failures and completely audio function is broken.

Add code to store the acp SoundWire pad keeper enable register and acp pad pulldown ctrl register values before entering into suspend state and restore the register values during resume sequence based on condition check for acp SoundWire pad keeper enable register for ACP6.3, ACP7.0 & ACP7.1 platforms.

Fixes: 491628388005 ("ASoC: amd: ps: add callback functions for acp pci driver pm ops") Signed-off-by: Vijendar Mukunda Vijendar.Mukunda@amd.com

---

sound/soc/amd/ps/acp63.h | 5 +++++ sound/soc/amd/ps/ps-common.c | 18 ++++++++++++++++++ 2 files changed, 23 insertions(+)

diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h index 85feae45c44c..babf2fa7ea27 100644 --- a/sound/soc/amd/ps/acp63.h +++ b/sound/soc/amd/ps/acp63.h @@ -82,6 +82,7 @@ #define ACP63_SDW0_DMA_MAX_STREAMS 6 #define ACP63_SDW1_DMA_MAX_STREAMS 2 #define ACP63_P1_AUDIO_TX_THRESHOLD 6 +#define ACP_SW_PAD_KEEPER_EN 0x0001454

/*

• Below entries describes SDW0 instance DMA stream id and DMA irq bit mapping

@@ -334,6 +335,8 @@ struct acp_hw_ops {

• @addr: pci ioremap address
• @reg_range: ACP reigister range
• @acp_rev: ACP PCI revision id

• • @acp_sw_pad_keeper_en: store acp SoundWire pad keeper enable register value
• • @acp_pad_pulldown_ctrl: store acp pad pulldown control register value
  • @acp63_sdw0-dma_intr_stat: DMA interrupt status array for ACP6.3 platform SoundWire
  • manager-SW0 instance
  • @acp63_sdw_dma_intr_stat: DMA interrupt status array for ACP6.3 platform SoundWire

@@ -367,6 +370,8 @@ struct acp63_dev_data { u32 addr; u32 reg_range; u32 acp_rev;

• u32 acp_sw_pad_keeper_en;
• u32 acp_pad_pulldown_ctrl; u16 acp63_sdw0_dma_intr_stat[ACP63_SDW0_DMA_MAX_STREAMS]; u16 acp63_sdw1_dma_intr_stat[ACP63_SDW1_DMA_MAX_STREAMS]; u16 acp70_sdw0_dma_intr_stat[ACP70_SDW0_DMA_MAX_STREAMS];

diff --git a/sound/soc/amd/ps/ps-common.c b/sound/soc/amd/ps/ps-common.c index 1c89fb5fe1da..f18d2a0d83aa 100644 --- a/sound/soc/amd/ps/ps-common.c +++ b/sound/soc/amd/ps/ps-common.c @@ -160,6 +160,8 @@ static int __maybe_unused snd_acp63_suspend(struct device *dev)

adata = dev_get_drvdata(dev); if (adata->is_sdw_dev) {

• adata->acp_sw_pad_keeper_en = readl(adata->acp63_base + ACP_SW_PAD_KEEPER_EN);
  

• adata->acp_pad_pulldown_ctrl = readl(adata->acp63_base + ACP_PAD_PULLDOWN_CTRL);
  

  adata->sdw_en_stat = check_acp_sdw_enable_status(adata); if (adata->sdw_en_stat) { writel(1, adata->acp63_base + ACP_ZSC_DSP_CTRL);

@@ -197,6 +199,7 @@ static int __maybe_unused snd_acp63_runtime_resume(struct device *dev) static int __maybe_unused snd_acp63_resume(struct device *dev) { struct acp63_dev_data *adata;

• u32 acp_sw_pad_keeper_en; int ret;

  adata = dev_get_drvdata(dev);

@@ -209,6 +212,12 @@ static int __maybe_unused snd_acp63_resume(struct device *dev) if (ret) dev_err(dev, "ACP init failed\n");

• acp_sw_pad_keeper_en = readl(adata->acp63_base + ACP_SW_PAD_KEEPER_EN);
• dev_dbg(dev, "ACP_SW_PAD_KEEPER_EN:0x%x\n", acp_sw_pad_keeper_en);
• if (!acp_sw_pad_keeper_en) {

• writel(adata->acp_sw_pad_keeper_en, adata->acp63_base + ACP_SW_PAD_KEEPER_EN);
  

• writel(adata->acp_pad_pulldown_ctrl, adata->acp63_base + ACP_PAD_PULLDOWN_CTRL);
  

• } return ret;

}

@@ -408,6 +417,8 @@ static int __maybe_unused snd_acp70_suspend(struct device *dev)

adata = dev_get_drvdata(dev); if (adata->is_sdw_dev) {

• adata->acp_sw_pad_keeper_en = readl(adata->acp63_base + ACP_SW0_PAD_KEEPER_EN);
  

As register offsets, ACP_SW_PAD_KEEPER_EN & ACP_SW0_PAD_KEEPER_EN are same, will use the same register macro and post the v2 version.

• adata->acp_pad_pulldown_ctrl = readl(adata->acp63_base + ACP_PAD_PULLDOWN_CTRL);
  

  adata->sdw_en_stat = check_acp_sdw_enable_status(adata); if (adata->sdw_en_stat) { writel(1, adata->acp63_base + ACP_ZSC_DSP_CTRL);

@@ -445,6 +456,7 @@ static int __maybe_unused snd_acp70_runtime_resume(struct device *dev) static int __maybe_unused snd_acp70_resume(struct device *dev) { struct acp63_dev_data *adata;

• u32 acp_sw_pad_keeper_en; int ret;

  adata = dev_get_drvdata(dev);

@@ -459,6 +471,12 @@ static int __maybe_unused snd_acp70_resume(struct device *dev) if (ret) dev_err(dev, "ACP init failed\n");

• acp_sw_pad_keeper_en = readl(adata->acp63_base + ACP_SW_PAD_KEEPER_EN);
• dev_dbg(dev, "ACP_SW_PAD_KEEPER_EN:0x%x\n", acp_sw_pad_keeper_en);
• if (!acp_sw_pad_keeper_en) {

• writel(adata->acp_sw_pad_keeper_en, adata->acp63_base + ACP_SW0_PAD_KEEPER_EN);
  

• writel(adata->acp_pad_pulldown_ctrl, adata->acp63_base + ACP_PAD_PULLDOWN_CTRL);
  

• } return ret;

}