linux-kernel - Re: [PATCH v5 1/5] mmc: core: Extend mmc_of

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Message-ID: <CAPDyKFq7ffHeWg-S41tLvScg_BXCUULig=G=EzD_to1TG0NhVg@mail.gmail.com>
Date:   Wed, 6 May 2020 18:36:12 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Cc:     Chun-Hung Wu <chun-hung.wu@...iatek.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Al Cooper <alcooperx@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michal Simek <michal.simek@...inx.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Pavel Machek <pavel@....cz>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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        Pan Bian <bianpan2016@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Mathieu Malaterre <malat@...ian.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        Yong Mao <yong.mao@...iatek.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>, wsd_upstream@...iatek.com,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v5 1/5] mmc: core: Extend mmc_of_parse() to parse CQE bindings

On Wed, 6 May 2020 at 15:01, Veerabhadrarao Badiganti
<vbadigan@...eaurora.org> wrote:
>
>
> On 4/28/2020 5:26 AM, Chun-Hung Wu wrote:
> > Parse CQE bindings "supports-cqe" and "disable-cqe-dcmd"
> > in mmc_of_parse().
> >
> > Signed-off-by: Chun-Hung Wu <chun-hung.wu@...iatek.com>
> > ---
> >   drivers/mmc/core/host.c | 5 +++++
> >   1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> > index c876872..47521c6 100644
> > --- a/drivers/mmc/core/host.c
> > +++ b/drivers/mmc/core/host.c
> > @@ -302,6 +302,11 @@ int mmc_of_parse(struct mmc_host *host)
> >               host->caps2 |= MMC_CAP2_NO_SD;
> >       if (device_property_read_bool(dev, "no-mmc"))
> >               host->caps2 |= MMC_CAP2_NO_MMC;
> > +     if (device_property_read_bool(dev, "supports-cqe"))
> > +             host->caps2 |= MMC_CAP2_CQE;
>
> This change is breaking emmc driver on qcom platforms where this dt
> property is defined.
>
> [    1.543453]  cqhci_deactivate+0xc/0x38
> [    1.545627]  sdhci_msm_reset+0x40/0x58
> [    1.549447]  sdhci_do_reset+0x48/0x7c
> [    1.553180]  __sdhci_read_caps+0x7c/0x214
> [    1.556913]  sdhci_setup_host+0x58/0xce8
> [    1.560905]  sdhci_msm_probe+0x588/0x8a4
> [    1.564900]  platform_drv_probe+0x4c/0xb0
>
> So, we cant have this flag defined before sdhci_setup_host().
>
> I will have to clear this cap and re-enable it in our initialization.

Thanks for reporting! I have dropped all the four patches from
Chun-Hung, so we can figure out how to fix this.

Please help to review the next version of the series.

>
> > +     if (!device_property_read_bool(dev, "disable-cqe-dcmd")) {
> > +             host->caps2 |= MMC_CAP2_CQE_DCMD;
> > +     }
> >
> >       /* Must be after "non-removable" check */
> >       if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {

Kind regards
Uffe