linux-kernel - Re: [PATCH 2/2] mmc: sdhci-acpi: AMDI0040: Allow changing HS200/HS400 driver strength

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Message-ID: <CAPDyKFqdnRoFseNsy+FhT+xWw+3ni9hiQgSq4gRmo=n8nP8xhA@mail.gmail.com>
Date:   Tue, 6 Oct 2020 11:40:08 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Raul E Rangel <rrangel@...omium.org>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>, Shirish.S@....com,
        Akshu Agrawal <Akshu.Agrawal@....com>,
        "Shah, Nehal-bakulchandra" <Nehal-bakulchandra.Shah@....com>,
        "Wang, Chris" <chris.wang@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mmc: sdhci-acpi: AMDI0040: Allow changing HS200/HS400
 driver strength

On Mon, 5 Oct 2020 at 14:50, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Mon, 28 Sep 2020 at 23:59, Raul E Rangel <rrangel@...omium.org> wrote:
> >
> > This change will allow platform designers better control over signal
> > integrity by allowing them to tune the HS200 and HS400 driver strengths.
> >
> > The driver strength was previously hard coded to A to solve boot
> > problems with certain platforms. This driver strength does not
> > universally apply to all platforms so we need a knob to adjust it.
> >
> > All older platforms currently have the SDR104 preset hard coded to A in
> > the firmware. This means that switching from the hard coded value in
> > the kernel to reading the SDR104 preset is a no-op for these platforms.
> > Newer platforms will have properly set presets. So this change will
> > support both new and old platforms.
> >
> > Signed-off-by: Raul E Rangel <rrangel@...omium.org>
>
> Applied for next, thanks!

Turned out that this doesn't build, hence I am dropping it from my
next branch. Please submit a new version.

[...]

Kind regards
Uffe