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From:   Ulf Hansson <ulf.hansson@linaro.org>
Date:   Wed, 25 Nov 2020 11:49:08 +0100
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Subject: Re: [PATCH] mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E
To:     Ben Chuang <benchuanggli@gmail.com>
Cc:     Adrian Hunter <adrian.hunter@intel.com>,
        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Ben Chuang <ben.chuang@genesyslogic.com.tw>,
        greg.tu@genesyslogic.com.tw
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On Wed, 25 Nov 2020 at 11:43, Ben Chuang <benchuanggli@gmail.com> wrote:
>
> Hi Ulf,
>
> On Wed, Nov 25, 2020 at 6:04 PM Ulf Hansson <ulf.hansson@linaro.org> wrote:
> >
> > On Wed, 25 Nov 2020 at 10:59, Ben Chuang <benchuanggli@gmail.com> wrote:
> > >
> > > From: Ben Chuang <ben.chuang@genesyslogic.com.tw>
> > >
> > > The GL9763E uses 150Mhz (slow mode) by default in HS400 mode. In order
> > > to make HS400 mode run at 200Mhz, the slow mode needs to be turned off.
> > >
> > > Fixes: 1ae1d2d6e555 ("mmc: sdhci-pci-gli: Add Genesys Logic GL9763E support")
> >
> > Why a fixes tag? This patch looks like an improvement and not a fix, right?
> >
>
> Since the specification defines that the HS400 mode must run at 200Mhz,
> this patch fixes the HS400 mode to 200Mhz.

The spec states that in HS400 mode the clock can be *up to 200MHz* -
not that it must run at 200MHz. At least at those places I have looked
at in the spec.

[...]

Kind regards
Uffe