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Message-ID: <CAD=FV=W-ajJDfYcP3P8Jyk_KgsUAbdTtmwiNXqJ=Ab2ojgrUGw@mail.gmail.com>
Date: Tue, 23 Aug 2022 07:13:06 -0700
From: Doug Anderson <dianders@...omium.org>
To: Heiko Stübner <heiko@...ech.de>
Cc: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Vinod Koul <vkoul@...nel.org>,
Chris Ruehl <chris.ruehl@...ys.com.hk>,
Jensen Huang <jensenhuang@...endlyarm.com>,
Brian Norris <briannorris@...omium.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: rockchip: add enable-strobe-pulldown to emmc
phy on rk3399
Hi,
On Tue, Aug 23, 2022 at 4:53 AM Heiko Stübner <heiko@...ech.de> wrote:
>
> Am Montag, 22. August 2022, 09:41:39 CEST schrieb Jensen Huang:
> > Internal pull-down for strobe line (GRF_EMMCPHY_CON2[9]) was disabled
> > by commit 8b5c2b45b8f0, which causes I/O error in HS400 mode.
> >
> > Tested on NanoPC-T4.
> >
> > Fixes: 8b5c2b45b8f0 ("phy: rockchip: set pulldown for strobe line in dts")
> > Signed-off-by: Jensen Huang <jensenhuang@...endlyarm.com>
>
> ok, so this looks like it restores previous functionality.
>
> I'm just wondering as the "offending" patch is from 2020, why this
> only turns up now. Any ideas?
Ah, I see. So before the offending patch we used to just leave the
pull state at whatever the default was when the kernel was booted.
After the offending patch we chose a default.
On kevin I see an external pull down on this line. Enabling both the
internal and external is probably not a huge deal, it'll just affect
the strength of the pull.
On bob I _think_ the external pull down is also stuffed.
...so I guess that would explain why it didn't cause a problem for at
least those two boards?
-Doug
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