linux-kernel - Re: [PATCH v2 2/3]mmc: enable runtime PM support of sdhci host controller

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Message-ID: <AANLkTinO7cgJgR0w=9dF0uSFFMh_ybb0bNXffXiCxy8p@mail.gmail.com>
Date:	Wed, 22 Dec 2010 14:26:39 +0100
From:	Pierre Tardy <tardyp@...il.com>
To:	Yunpeng Gao <yunpeng.gao@...el.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3]mmc: enable runtime PM support of sdhci host controller

> +int sdhci_runtime_suspend(struct sdhci_host *host)
> +{
> +       int ret = 0;
> +
> +       if (host->vmmc)
> +               ret = regulator_disable(host->vmmc);
Please dont suspend the card's power in the sdhci's suspend function.
This means the card will die.
Think of the wifi idle use case where the wifi is working, but sdio
bus is not used. sdhci will suspend, but wifi card wont.
manipulation of the host->vmmc must be done in set_ios() (I will send
the patch later in the week...)

Regards,
-- 
Pierre
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