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[91.67.66.34]) by smtp.gmail.com with ESMTPSA id f24-20020a056402069800b004316f94ec4esm3142765edy.66.2022.07.15.10.01.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 15 Jul 2022 10:01:03 -0700 (PDT) Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.100.31\)) Subject: [PATCH v3] arm64: dts: rockchip: Fix SD card init on rk3399-nanopi4 From: =?utf-8?q?Christian_Kohlsch=C3=BCtter?= In-Reply-To: <502b3fbe-3077-407e-6010-a8cb3ffce7d6@arm.com> Date: Fri, 15 Jul 2022 19:01:02 +0200 Cc: linux-arm-kernel , "open list:ARM/Rockchip SoC..." , linux-kernel , Linux MMC List Message-Id: <449292CA-CE60-4B90-90F7-295FBFEAB3F8@kohlschutter.com> References: <12878108.O9o76ZdvQC@diego> <103b714c-b07c-f016-1062-84bd94786b22@arm.com> <9AF1E75F-5947-49B0-887D-82C426527B99@kohlschutter.com> <590f7a08-a6ca-be54-4254-363343642a52@arm.com> <5ca9bd94-54d9-04f8-0098-a56ffb6f5fe1@arm.com> <502b3fbe-3077-407e-6010-a8cb3ffce7d6@arm.com> To: Robin Murphy , wens@kernel.org, =?utf-8?q?Heiko_St?= =?utf-8?q?=C3=BCbner?= , Markus Reichl X-Mailer: Apple Mail (2.3696.100.31) Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org mmc/SD-card initialization may fail on NanoPi R4S with "mmc1: problem reading SD Status register" / "mmc1: error -110 whilst initialising SD card" either on cold boot or after a reboot. Moreover, the system would also sometimes hang upon reboot. This is prevented by setting an explicit undervoltage protection limit for the SD-card-specific vcc3v0_sd voltage regulator. While using a limit of 3V seems to work, an additional safety buffer should prevent accidental tripping, preventing a system hang. Set the undervoltage protection limit to 2.7V, which is the minimum permissible SD card operating voltage. Signed-off-by: Christian Kohlschütter --- arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi | 4 ++++ 1 file changed, 4 insertions(+) mode change 100644 => 100755 arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi old mode 100644 new mode 100755 index 8c0ff6c96e03..669c74ce4d13 --- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi @@ -73,6 +73,10 @@ vcc3v0_sd: vcc3v0-sd { regulator-always-on; regulator-min-microvolt = <3000000>; regulator-max-microvolt = <3000000>; + + // must be initialized or SD card may fail to initialize / system may hang + regulator-uv-protection-microvolt = <2700000>; + regulator-name = "vcc3v0_sd"; vin-supply = <&vcc3v3_sys>; };