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

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Date:   Thu, 8 Jul 2021 19:00:09 +0530
From:   "Mukunda,Vijendar" <vijendar.mukunda@....com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.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

On 7/7/21 9:45 PM, Pierre-Louis Bossart wrote:
> Missing 'ASoC: amd' prefix in commit subject?
Will add prefix.
> 
> 
>> +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?
Yes we can do that. will fix it.
> 
>> +			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?
>
BIOS will apply ACP Power gating(which is part of ACP power off
sequence) when ACP enters D3 state. i.e BIOS will control ACP Power gating.

acp5x_power_off() API is no longer required.This was implemented to
verify ACP Power gating during initial driver bring up.

We will drop acp5x_power_off() API, will remove acp_power_gating
parameter and post the new version.