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

["Amadeusz Sławiński" <amadeuszx.slawinski@linux.intel.com>]

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@amd.com>
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
> ---
>   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);
>   }