linux-kernel - Re: [PATCH v3 2/2] davinci: MMC: updates to suspend/resume implementation

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Message-Id: <20100112153733.fd182ed1.akpm@linux-foundation.org>
Date:	Tue, 12 Jan 2010 15:37:33 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chaithrika U S <chaithrika@...com>
Cc:	linux-kernel@...r.kernel.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	khilman@...prootsystems.com
Subject: Re: [PATCH  v3 2/2] davinci: MMC: updates to suspend/resume
 implementation

On Fri,  8 Jan 2010 17:09:00 +0530
Chaithrika U S <chaithrika@...com> wrote:

> -static int davinci_mmcsd_suspend(struct platform_device *pdev, pm_message_t msg)
> +static int davinci_mmcsd_suspend(struct device *dev)
>  {
> +	struct platform_device *pdev = to_platform_device(dev);
>  	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
> +	struct pm_message msg = { PM_EVENT_SUSPEND };
> +	int ret;
>  
> -	return mmc_suspend_host(host->mmc, msg);
> +	mmc_host_enable(host->mmc);
> +	ret = mmc_suspend_host(host->mmc, msg);
> +	if (!ret) {
> +		writel(0, host->base + DAVINCI_MMCIM);
> +		mmc_davinci_reset_ctrl(host, 1);
> +		mmc_host_disable(host->mmc);
> +		clk_disable(host->clk);
> +		host->suspended = 1;
> +	} else {
> +		host->suspended = 0;
> +		mmc_host_disable(host->mmc);
> +	}
> +
> +	return ret;
>  }
>  
> -static int davinci_mmcsd_resume(struct platform_device *pdev)
> +static int davinci_mmcsd_resume(struct device *dev)
>  {
> +	struct platform_device *pdev = to_platform_device(dev);
>  	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
> +	int ret;
>  
> -	return mmc_resume_host(host->mmc);
> +	if (!host->suspended)
> +		return 0;
> +
> +	clk_enable(host->clk);
> +	mmc_host_enable(host->mmc);
> +
> +	mmc_davinci_reset_ctrl(host, 0);
> +	ret = mmc_resume_host(host->mmc);
> +	if (!ret)
> +		host->suspended = 0;
> +
> +	return ret;
>  }

Was it proper to ignore the mmc_host_enable() return values?
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