linux-kernel - Re: [alsa-devel] [PATCH v3 6/6] ASoC: amd: Added ACP3x system resume and runtime pm

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Date:   Thu, 7 Nov 2019 09:34:28 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@....com>
Cc:     "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        Maruthi Bayyavarapu <maruthi.bayyavarapu@....com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        open list <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Liam Girdwood <lgirdwood@...il.com>, Akshu.Agrawal@....com,
        Mark Brown <broonie@...nel.org>, djkurtz@...gle.com,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Colin Ian King <colin.king@...onical.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [alsa-devel] [PATCH v3 6/6] ASoC: amd: Added ACP3x system resume
 and runtime pm


> +static int acp3x_power_on(void __iomem *acp3x_base)
> +{
> +	u32 val;
> +	u32 timeout = 0;
> +	int ret = 0;
> +
> +	val = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
> +
> +	if (val == 0)
> +		return val;
> +
> +	if (!((val & ACP_PGFSM_STATUS_MASK) ==
> +				ACP_POWER_ON_IN_PROGRESS))
> +		rv_writel(ACP_PGFSM_CNTL_POWER_ON_MASK,
> +			acp3x_base + mmACP_PGFSM_CONTROL);
> +	while (++timeout < 500) {
> +		val  = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
> +		if (!val)
> +			break;
> +		udelay(1);
> +		if (timeout > 500) {

your timeout cannot reach 500, isn't this dead code?

> +			pr_err("ACP is Not Powered ON\n");
> +			return -ETIMEDOUT;
> +		}
> +	}
> +}
> +
> +static int acp3x_power_off(void __iomem *acp3x_base)
> +{
> +	u32 val;
> +	u32 timeout = 0;
> +
> +	rv_writel(ACP_PGFSM_CNTL_POWER_OFF_MASK,
> +			acp3x_base + mmACP_PGFSM_CONTROL);
> +	while (++timeout < 500) {
> +		val  = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
> +		if ((val & ACP_PGFSM_STATUS_MASK) == ACP_POWERED_OFF)
> +			return 0;
> +		udelay(1);
> +		if (timeout > 500) {

same here, the timeout handling looks broken

> +			pr_err("ACP is Not Powered OFF\n");
> +			return -ETIMEDOUT;
> +		}
> +	}
> +}
> +
> +
> +static int acp3x_reset(void __iomem *acp3x_base)
> +{
> +	u32 val, timeout;
> +
> +	rv_writel(1, acp3x_base + mmACP_SOFT_RESET);
> +	timeout = 0;
> +	while (++timeout < 100) {
> +		val = rv_readl(acp3x_base + mmACP_SOFT_RESET);
> +		if ((val & ACP3x_SOFT_RESET__SoftResetAudDone_MASK) ||
> +							timeout > 100) {

and here, how can timeout > 100 if the outer loops controls it.

> +			if (val & ACP3x_SOFT_RESET__SoftResetAudDone_MASK)
> +				break;
> +			return -ENODEV;
> +		}
> +		cpu_relax();
> +	}
> +	rv_writel(0, acp3x_base + mmACP_SOFT_RESET);
> +	timeout = 0;
> +	while (++timeout < 100) {
> +		val = rv_readl(acp3x_base + mmACP_SOFT_RESET);
> +		if (!val)
> +			break;
> +		if (timeout > 100)

same here

> +static int  snd_acp3x_suspend(struct device *dev)
extra spaces?

> +{
> +	int status;
> +	struct acp3x_dev_data *adata = dev_get_drvdata(dev);
> +
> +	status = acp3x_deinit(adata->acp3x_base);
> +	if (status)
> +		dev_err(dev, "ACP de-init failed\n");
> +	else
> +		dev_info(dev, "ACP de-initialized\n");
> +
> +	return 0;
> +}
> +static int  snd_acp3x_resume(struct device *dev)

extra spaces?