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arm64: dts: rockchip: Add mphy reset to ufshc node

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The mphy reset signal is used to reset the physical adapter. Resetting
other components while leaving the mphy unreset may occasionally prevent
the UFS controller from successfully linking up with the device.

This addresses an intermittent hardware bug where the UFS link fails to
establish under specific timing conditions with certain chips. While
difficult to reproduce initially, this issue was consistently observed in
downstream testing and requires explicit mphy reset control for full
stability.

Fixes: c75e5e010f ("scsi: arm64: dts: rockchip: Add UFS support for RK3576 SoC")
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Link: https://patch.msgid.link/1773277913-29580-1-git-send-email-shawn.lin@rock-chips.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Shawn Lin 2026-03-12 09:11:53 +08:00 committed by Heiko Stuebner
parent 8c2c73084b
commit 792c42da47
1 changed files with 3 additions and 2 deletions
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5
arch/arm64/boot/dts/rockchip/rk3576.dtsi
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@ -1948,8 +1948,9 @@ ufshc: ufshc@2a2d0000 {
pinctrl-0 = <&ufs_refclk &ufs_rstgpio>;
pinctrl-names = "default";
resets = <&cru SRST_A_UFS_BIU>, <&cru SRST_A_UFS_SYS>,
<&cru SRST_A_UFS>, <&cru SRST_P_UFS_GRF>;
reset-names = "biu", "sys", "ufs", "grf";
<&cru SRST_A_UFS>, <&cru SRST_P_UFS_GRF>,
<&cru SRST_MPHY_INIT>;
reset-names = "biu", "sys", "ufs", "grf", "mphy";
reset-gpios = <&gpio4 RK_PD0 GPIO_ACTIVE_LOW>;
status = "disabled";
};