linux-kernel - Re: [PATCH 1/2] mmc: sdhci-of-at91: add quirk for broken HS200

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Date:   Fri, 9 Aug 2019 10:08:43 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     <Eugen.Hristev@...rochip.com>,
        Nicolas Ferre <Nicolas.Ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH 1/2] mmc: sdhci-of-at91: add quirk for broken HS200

On Thu, Aug 08, 2019 at 05:23:00PM +0200, Ulf Hansson wrote:
> On Thu, 8 Aug 2019 at 10:35, <Eugen.Hristev@...rochip.com> wrote:
> >
> > From: Eugen Hristev <eugen.hristev@...rochip.com>
> >
> > HS200 is not implemented in the driver, but the controller claims it
> > through caps.
> > Remove it via quirk.
> > Without this quirk, the mmc core will try to enable hs200, which will fail,
> > and the eMMC initialization will fail.
> >
> > Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> 
> Should this be applied as a fix and possibly tagged for stable?
> 
> In such case, do you have a specific commit that it fixes?

I think so, I would say:
Fixes: bb5f8ea4d514 ("mmc: sdhci-of-at91: introduce driver for the Atmel SDMMC")
Cc: stable@...r.kernel.org #v4.4 and later

It doesn't apply on 4.4 but resolution is trivial.

Regards

Ludovic

> 
> Kind regards
> Uffe
> 
> > ---
> >  drivers/mmc/host/sdhci-of-at91.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> > index 57fe3b2..3a8c6d8 100644
> > --- a/drivers/mmc/host/sdhci-of-at91.c
> > +++ b/drivers/mmc/host/sdhci-of-at91.c
> > @@ -370,6 +370,9 @@ static int sdhci_at91_probe(struct platform_device *pdev)
> >         pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
> >         pm_runtime_use_autosuspend(&pdev->dev);
> >
> > +       /* HS200 is broken at this moment */
> > +       host->quirks2 = SDHCI_QUIRK2_BROKEN_HS200;
> > +
> >         ret = sdhci_add_host(host);
> >         if (ret)
> >                 goto pm_runtime_disable;
> > --
> > 2.7.4
> >