linux-kernel - Re: [PATCH 2/2] mmc: sdhci-brcmstb: "mmc1: Internal clock never stabilised." seen on 72113

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Date:   Thu, 2 Dec 2021 09:28:48 -0800
From:   Florian Fainelli <florian.fainelli@...adcom.com>
To:     Al Cooper <alcooperx@...il.com>, linux-kernel@...r.kernel.org
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH 2/2] mmc: sdhci-brcmstb: "mmc1: Internal clock never
 stabilised." seen on 72113

On 12/2/21 8:30 AM, Al Cooper wrote:
> The problem is in the .shutdown callback that was added to the
> sdhci-iproc and sdhci-brcmstb drivers to save power in S5. The
> shutdown callback will just call the sdhci_pltfm_suspend() function
> to suspend the lower level driver and then stop the sdhci system
> clock. The problem is that in some cases there can be a worker
> thread in the "system_freezable_wq" work queue that is scanning
> for a device every second. In normal system suspend, this queue
> is suspended before the driver suspend is called. In shutdown the
> queue is not suspended and the thread my run after we stop the
> sdhci clock in the shutdown callback which will cause the "clock
> never stabilised" error. The solution will be to have the shutdown
> callback cancel the worker thread before calling suspend (and
> stopping the sdhci clock).
> 
> NOTE: This is only happening on systems with the Legacy RPi SDIO
> core because that's the only controller that doesn't have the
> presence signal and needs to use a worker thread to do a 1 second
> poll loop.
> 
> Fixes: 5b191dcba719 ("mmc: sdhci-brcmstb: Fix mmc timeout errors on S5 suspend")
> Signed-off-by: Al Cooper <alcooperx@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian

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