Re: [PATCH 03/13] ASoC: amd: add acp6.2 init/de-init functions

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On 8/12/2022 2:07 PM, Syed Saba kareem wrote:
Add Pink Sardine platform ACP6.2 PCI driver init/deinit functions.

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@xxxxxxx>
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
---
  sound/soc/amd/ps/acp62.h  |  12 +++++
  sound/soc/amd/ps/pci-ps.c | 109 ++++++++++++++++++++++++++++++++++++++
  2 files changed, 121 insertions(+)

diff --git a/sound/soc/amd/ps/acp62.h b/sound/soc/amd/ps/acp62.h
index e91762240c93..8e734f190b11 100644
--- a/sound/soc/amd/ps/acp62.h
+++ b/sound/soc/amd/ps/acp62.h
@@ -10,6 +10,18 @@
  #define ACP_DEVICE_ID 0x15E2
  #define ACP62_PHY_BASE_ADDRESS 0x1240000
+#define ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK 0x00010001
+#define ACP_PGFSM_CNTL_POWER_ON_MASK	1
+#define ACP_PGFSM_CNTL_POWER_OFF_MASK	0
+#define ACP_PGFSM_STATUS_MASK		3
+#define ACP_POWERED_ON			0
+#define ACP_POWER_ON_IN_PROGRESS	1
+#define ACP_POWERED_OFF			2
+#define ACP_POWER_OFF_IN_PROGRESS	3
+
+#define ACP_ERROR_MASK 0x20000000
+#define ACP_EXT_INTR_STAT_CLEAR_MASK 0xFFFFFFFF
+
  static inline u32 acp62_readl(void __iomem *base_addr)
  {
  	return readl(base_addr - ACP62_PHY_BASE_ADDRESS);
diff --git a/sound/soc/amd/ps/pci-ps.c b/sound/soc/amd/ps/pci-ps.c
index 25169797275c..2014f415af15 100644
--- a/sound/soc/amd/ps/pci-ps.c
+++ b/sound/soc/amd/ps/pci-ps.c
@@ -8,6 +8,7 @@
  #include <linux/pci.h>
  #include <linux/module.h>
  #include <linux/io.h>
+#include <linux/delay.h>
#include "acp62.h" @@ -15,6 +16,103 @@ struct acp62_dev_data {
  	void __iomem *acp62_base;
  };
+static int acp62_power_on(void __iomem *acp_base)
+{
+	u32 val;
+	int timeout;
+
+	val = acp62_readl(acp_base + ACP_PGFSM_STATUS);
+
+	if (!val)
+		return val;
+
+	if ((val & ACP_PGFSM_STATUS_MASK) != ACP_POWER_ON_IN_PROGRESS)
+		acp62_writel(ACP_PGFSM_CNTL_POWER_ON_MASK, acp_base + ACP_PGFSM_CONTROL);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = acp62_readl(acp_base + ACP_PGFSM_STATUS);
+		if (!val)
+			return 0;
+		udelay(1);
+	}
+	return -ETIMEDOUT;
+}
+
+static int acp62_reset(void __iomem *acp_base)
+{
+	u32 val;
+	int timeout;
+
+	acp62_writel(1, acp_base + ACP_SOFT_RESET);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = acp62_readl(acp_base + ACP_SOFT_RESET);
+		if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
+			break;
+		cpu_relax();
+	}
+	acp62_writel(0, acp_base + ACP_SOFT_RESET);
+	timeout = 0;
+	while (++timeout < 500) {
+		val = acp62_readl(acp_base + ACP_SOFT_RESET);
+		if (!val)
+			return 0;
+		cpu_relax();
+	}
+	return -ETIMEDOUT;
+}
+
+static void acp62_enable_interrupts(void __iomem *acp_base)
+{
+	acp62_writel(0x01, acp_base + ACP_EXTERNAL_INTR_ENB);

In function before you just write decimal 1 and 0, and here and later in patch you use hex values? Should probably be consistent.

+}
+
+static void acp62_disable_interrupts(void __iomem *acp_base)
+{
+	acp62_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp_base +
+		     ACP_EXTERNAL_INTR_STAT);
+	acp62_writel(0x00, acp_base + ACP_EXTERNAL_INTR_CNTL);
+	acp62_writel(0x00, acp_base + ACP_EXTERNAL_INTR_ENB);
+}
+
+static int acp62_init(void __iomem *acp_base)
+{
+	int ret;
+
+	/* power on */
Unnecessary comment? Called function name is already self explanatory, no need to repeat it.
+	ret = acp62_power_on(acp_base);
+	if (ret) {
+		pr_err("ACP power on failed\n");
+		return ret;
+	}
+	acp62_writel(0x01, acp_base + ACP_CONTROL);
+	/* Reset */
Same here?
+	ret = acp62_reset(acp_base);
+	if (ret) {
+		pr_err("ACP reset failed\n");
+		return ret;
+	}
+	acp62_writel(0x03, acp_base + ACP_CLKMUX_SEL);
+	acp62_enable_interrupts(acp_base);
+	return 0;
+}
+
+static int acp62_deinit(void __iomem *acp_base)
+{
+	int ret;
+
+	acp62_disable_interrupts(acp_base);
+	/* Reset */
Again
+	ret = acp62_reset(acp_base);
+	if (ret) {
+		pr_err("ACP reset failed\n");
+		return ret;
+	}
+	acp62_writel(0x00, acp_base + ACP_CLKMUX_SEL);
+	acp62_writel(0x00, acp_base + ACP_CONTROL);
+	return 0;
+}
+
  static int snd_acp62_probe(struct pci_dev *pci,
  			   const struct pci_device_id *pci_id)
  {
@@ -56,6 +154,10 @@ static int snd_acp62_probe(struct pci_dev *pci,
  	}
  	pci_set_master(pci);
  	pci_set_drvdata(pci, adata);
+	ret = acp62_init(adata->acp62_base);
+	if (ret)
+		goto release_regions;
+
  	return 0;
  release_regions:
  	pci_release_regions(pci);
@@ -67,6 +169,13 @@ static int snd_acp62_probe(struct pci_dev *pci,
static void snd_acp62_remove(struct pci_dev *pci)
  {
+	struct acp62_dev_data *adata;
+	int ret;
+
+	adata = pci_get_drvdata(pci);
+	ret = acp62_deinit(adata->acp62_base);
+	if (ret)
+		dev_err(&pci->dev, "ACP de-init failed\n");
  	pci_release_regions(pci);
  	pci_disable_device(pci);
  }




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