linux-kernel - Re: [PATCH] mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E

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Message-ID: <CAPDyKFq=r8Fwt1j7S1F5fCsMjGp6mxfWWPjppA0CVjx17MVRVQ@mail.gmail.com>
Date:   Wed, 25 Nov 2020 11:49:08 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Ben Chuang <benchuanggli@...il.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        greg.tu@...esyslogic.com.tw
Subject: Re: [PATCH] mmc: sdhci-pci-gli: Disable slow mode in HS400 mode for GL9763E

On Wed, 25 Nov 2020 at 11:43, Ben Chuang <benchuanggli@...il.com> wrote:
>
> Hi Ulf,
>
> On Wed, Nov 25, 2020 at 6:04 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
> >
> > On Wed, 25 Nov 2020 at 10:59, Ben Chuang <benchuanggli@...il.com> wrote:
> > >
> > > From: Ben Chuang <ben.chuang@...esyslogic.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