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@xxxxxxxxxxxxx/ [2]: https://lore.kernel.org/all/20220822074139.3810-1-jensenhuang@xxxxxxxxxxxxxxx/ 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
