linux-kernel - Re: [PATCH 03/12] add acp5x init/de-init functions

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Date:   Wed, 7 Jul 2021 11:15:17 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vijendar Mukunda <vijendar.mukunda@....com>, broonie@...nel.org,
        alsa-devel@...a-project.org
Cc:     Sunil-kumar.Dommati@....com, Liam Girdwood <lgirdwood@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>, Alexander.Deucher@....com
Subject: Re: [PATCH 03/12] add acp5x init/de-init functions

Missing 'ASoC: amd' prefix in commit subject?


> +static int acp5x_power_on(void __iomem *acp5x_base)
> +{
> +	u32 val;
> +	int timeout;
> +
> +	val = acp_readl(acp5x_base + ACP_PGFSM_STATUS);
> +
> +	if (val == 0)
> +		return val;
> +
> +	if ((val & ACP_PGFSM_STATUS_MASK) !=
> +				ACP_POWER_ON_IN_PROGRESS)
> +		acp_writel(ACP_PGFSM_CNTL_POWER_ON_MASK,
> +			   acp5x_base + ACP_PGFSM_CONTROL);
> +	timeout = 0;
> +	while (++timeout < 500) {
> +		val = acp_readl(acp5x_base + ACP_PGFSM_STATUS);
> +		if (!val)

Shouldn't you use something like 
if ((val & ACP_PGFSM_STATUS_MASK) == ACP_POWERED_ON)
for symmetry with the power-off case?

> +			return 0;
> +		udelay(1);
> +	}
> +	return -ETIMEDOUT;
> +}
> +
> +static int acp5x_power_off(void __iomem *acp5x_base)
> +{
> +	u32 val;
> +	int timeout;
> +
> +	acp_writel(ACP_PGFSM_CNTL_POWER_OFF_MASK,
> +		   acp5x_base + ACP_PGFSM_CONTROL);
> +	timeout = 0;
> +	while (++timeout < 500) {
> +		val = acp_readl(acp5x_base + ACP_PGFSM_STATUS);
> +		if ((val & ACP_PGFSM_STATUS_MASK) == ACP_POWERED_OFF)
> +			return 0;
> +		udelay(1);
> +	}
> +	return -ETIMEDOUT;
> +}
> +
> +static int acp5x_reset(void __iomem *acp5x_base)
> +{
> +	u32 val;
> +	int timeout;
> +
> +	acp_writel(1, acp5x_base + ACP_SOFT_RESET);
> +	timeout = 0;
> +	while (++timeout < 500) {
> +		val = acp_readl(acp5x_base + ACP_SOFT_RESET);
> +		if (val & ACP_SOFT_RESET_SOFTRESET_AUDDONE_MASK)
> +			break;
> +		cpu_relax();
> +	}
> +	acp_writel(0, acp5x_base + ACP_SOFT_RESET);
> +	timeout = 0;
> +	while (++timeout < 500) {
> +		val = acp_readl(acp5x_base + ACP_SOFT_RESET);
> +		if (!val)
> +			return 0;
> +		cpu_relax();
> +	}
> +	return -ETIMEDOUT;
> +}
> +
> +static void acp5x_enable_interrupts(void __iomem *acp5x_base)
> +{
> +	acp_writel(0x01, acp5x_base + ACP_EXTERNAL_INTR_ENB);
> +}
> +
> +static void acp5x_disable_interrupts(void __iomem *acp5x_base)
> +{
> +	acp_writel(ACP_EXT_INTR_STAT_CLEAR_MASK, acp5x_base +
> +		   ACP_EXTERNAL_INTR_STAT);
> +	acp_writel(0x00, acp5x_base + ACP_EXTERNAL_INTR_CNTL);
> +	acp_writel(0x00, acp5x_base + ACP_EXTERNAL_INTR_ENB);
> +}
> +
> +static int acp5x_init(void __iomem *acp5x_base)
> +{
> +	int ret;
> +
> +	/* power on */
> +	ret = acp5x_power_on(acp5x_base);
> +	if (ret) {
> +		pr_err("ACP5x power on failed\n");
> +		return ret;
> +	}
> +	/* Reset */
> +	ret = acp5x_reset(acp5x_base);
> +	if (ret) {
> +		pr_err("ACP5x reset failed\n");
> +		return ret;
> +	}
> +	acp5x_enable_interrupts(acp5x_base);
> +	return 0;
> +}
> +
> +static int acp5x_deinit(void __iomem *acp5x_base)
> +{
> +	int ret;
> +
> +	acp5x_disable_interrupts(acp5x_base);
> +	/* Reset */
> +	ret = acp5x_reset(acp5x_base);
> +	if (ret) {
> +		pr_err("ACP5x reset failed\n");
> +		return ret;
> +	}
> +	/* power off */
> +	if (acp_power_gating) {
> +		ret = acp5x_power_off(acp5x_base);
> +		if (ret) {
> +			pr_err("ACP5x power off failed\n");
> +			return ret;
> +		}
> +	}
> +	return 0;

shouldn't you have a sequence for shutdown that ignores the acp_power_gating parameter?