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Date:	Mon, 4 Aug 2014 22:12:35 +0200
From:	Arend van Spriel <>
To:	Russell King - ARM Linux <>
CC:	"Fu, Zhonghui" <>,
	<>, Franky Lin <>,
	<>, <>,
	<>, <>,
	<>, <>,
	<>, <>,
	<>, <>,
	<>, <>
Subject: Re: [PATCH] brcmfmac: prevent watchdog from interfering with	scanning
 and connecting

On 08/04/14 18:52, Russell King - ARM Linux wrote:
> On Tue, Aug 05, 2014 at 12:36:49AM +0800, Fu, Zhonghui wrote:
>> Hi, Arend
>> I investigated this issue, and its root cause is still that sdio
>> controller can't receive interrupts from WiFi chip on sdio bus when
>> sdio controller is in runtime suspend status. I am running 3.16-rc5
>> linux kernel on ASUS T100TA tablet, and using sdhci-acpi driver.
> That's the root cause.  I fixed this with the Freescale i.MX SD driver
> which is now able to report pending SDIO interrupts while runtime PM
> suspended.
> Other host drivers probably need fixing too, or having runtime PM
> disabled on them - if you can't receive SDIO interrupts while runtime
> PM suspended, then entering runtime PM while you have a SDIO device
> attached is a bug.
> This is something for the MMC people to deal with rather than Arend.

Occasionally, the itch is there to fix mmc code, but this looks a bit 
tricky. The fun starts in sdio.c:mmc_attach_sdio():

	 * Enable runtime PM only if supported by host+card+board
	if (host->caps & MMC_CAP_POWER_OFF_CARD) {
		 * Let runtime PM core know our card is active
		err = pm_runtime_set_active(&card->dev);
		if (err)
			goto remove;

		 * Enable runtime PM for this card

The comment above the if statement seems to be stating the right idea, 
but the code only looks at the host controller capability flags.


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