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From: Folker Schwesinger <dev@folker-schwesinger.de>
To: Vinod Koul <vkoul@kernel.org>,
	Yogesh Hegde <yogi.kernel@gmail.com>,
	Heiko Stuebner <heiko@sntech.de>,
	Chris Ruehl <chris.ruehl@gtsys.com.hk>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>
Cc: Folker Schwesinger <dev@folker-schwesinger.de>,
	Dragan Simic <dsimic@manjaro.org>,
	Christopher Obbard <chris.obbard@collabora.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org
Subject: [PATCH 0/2] Enable internal strobe pulldown on Radxa ROCK 4 SBCs
Date: Wed, 27 Mar 2024 20:26:36 +0100
Message-ID: <20240327192641.14220-1-dev@folker-schwesinger.de>
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Various RK3399 boards, including the ROCK Pi 4 series showed instabilities
with some eMMC modules when operating in HS400 mode [1]. Later, a missing
pull-down resistor on the eMMC strobe line was identified as the root
cause of these instabilities [2].

This series enables the internal pull-down on the eMMC PHY strobe line
for all ROCK 4 series boards as they all lack an external strobe
pull-down resistor.

Furthermore, HS400 mode is re-enabled for these boards. Previously, to
workaround the instabilities until the issue was investigated further,
HS400 mode was replaced with HS200 mode [1].

[1]: https://lore.kernel.org/all/20230705144255.115299-1-chris.obbard@collabora.com/
[2]: https://lore.kernel.org/all/20220822074139.3810-1-jensenhuang@friendlyarm.com/


Folker Schwesinger (2):
  arm64: dts: rockchip: Add enable-strobe-pulldown to emmc phy on ROCK
    Pi 4
  arm64: dts: rockchip: Add enable-strobe-pulldown to emmc phy on ROCK
    4C+

 arch/arm64/boot/dts/rockchip/rk3399-rock-4c-plus.dts | 4 +++-
 arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi   | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)


base-commit: 4cece764965020c22cff7665b18a012006359095
-- 
2.44.0