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Date: Mon, 4 Aug 2014 22:12:35 +0200 From: Arend van Spriel <arend@...adcom.com> To: Russell King - ARM Linux <linux@....linux.org.uk> CC: "Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>, <brudley@...adcom.com>, Franky Lin <frankyl@...adcom.com>, <meuleman@...adcom.com>, <linville@...driver.com>, <pieterpg@...adcom.com>, <dekim@...adcom.com>, <mcgrof@...not-panic.com>, <antonio@...n-mesh.com>, <johannes.berg@...el.com>, <linux-wireless@...r.kernel.org>, <brcm80211-dev-list@...adcom.com>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org> 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 */ pm_runtime_enable(&card->dev); } The comment above the if statement seems to be stating the right idea, but the code only looks at the host controller capability flags. Regards, Arend -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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