linux-kernel - Re: [PATCH 5/5] ASoC: amd: ACP powergating should be done by controller

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Date:   Thu, 26 Sep 2019 15:55:38 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@....com>
Cc:     Alexander.Deucher@....com,
        Vijendar Mukunda <vijendar.mukunda@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maruthi Bayyavarapu <maruthi.bayyavarapu@....com>,
        YueHaibing <yuehaibing@...wei.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Colin Ian King <colin.king@...onical.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] ASoC: amd: ACP powergating should be done by
 controller

On Fri, Sep 27, 2019 at 04:37:39AM +0530, Ravulapati Vishnu vardhan rao wrote:
> +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) {

Flip this around.

	if (!val)
		return 0;

> +		if (!((val & ACP_PGFSM_STATUS_MASK) ==
> +				ACP_POWER_ON_IN_PROGRESS))

Use != insead of !(foo == bar).

	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 (true) {
> +			val  = rv_readl(acp3x_base + mmACP_PGFSM_STATUS);
> +			if (!val)
> +				break;

return 0;



> +			udelay(1);
> +			if (timeout > 500) {

if (timeout++ > 500) {


> +				pr_err("ACP is Not Powered ON\n");

We print two error messages.  :/


> +				ret = -ETIMEDOUT;

return -ETIMOUT;

> +				break;
> +			}
> +			timeout++;
> +		}
> +		if (ret) {
> +			pr_err("ACP is not powered on status:%d\n", ret);
> +			return ret;
> +		}
> +	}
> +	return ret;
> +}

regards,
dan carpenter