linux-kernel - Re: [PATCH v2] arm64: dts: amlogic: gxbb-odroidc2: remove UHS capability for SD card

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Message-Id: <175749008761.1189257.11203428787242176794.b4-ty@linaro.org>
Date: Wed, 10 Sep 2025 09:41:27 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Kevin Hilman <khilman@...libre.com>, 
 Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
 Valerio Setti <vsetti@...libre.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: amlogic: gxbb-odroidc2: remove UHS
 capability for SD card

Hi,

On Mon, 08 Sep 2025 21:50:03 +0200, Valerio Setti wrote:
> This is meant to resolve reboot not working on this board.
> 
> The problem is as follows. In order to be able to switch from HS to UHS
> mode the bus voltage needs to be reduced from 3.3V down to 1.8V and this
> is achieved by the "vqmmc-supply" regulator. The ROM bootloader is only
> able to manage the card in HS mode (3.3V) and the switch HS->UHS happen
> at boottime in the kernel. The problem appears when the reboot command
> is issued or watchdog expires because in this case the "vqmmc-supply"
> voltage is not returned back at 3.3V before rebooting the board so the
> ROM bootloader will be completely stuck.
> 
> [...]

Thanks, Applied to https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git (v6.18/arm64-dt)

[1/1] arm64: dts: amlogic: gxbb-odroidc2: remove UHS capability for SD card
      https://git.kernel.org/amlogic/c/663bfe77b6f70bcb33b2607e16c94fcb1029580e

These changes has been applied on the intermediate git tree [1].

The v6.18/arm64-dt branch will then be sent via a formal Pull Request to the Linux SoC maintainers
for inclusion in their intermediate git branches in order to be sent to Linus during
the next merge window, or sooner if it's a set of fixes.

In the cases of fixes, those will be merged in the current release candidate
kernel and as soon they appear on the Linux master branch they will be
backported to the previous Stable and Long-Stable kernels [2].

The intermediate git branches are merged daily in the linux-next tree [3],
people are encouraged testing these pre-release kernels and report issues on the
relevant mailing-lists.

If problems are discovered on those changes, please submit a signed-off-by revert
patch followed by a corrective changeset.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/amlogic/linux.git
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
[3] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

-- 
Neil