linux-kernel - [PATCH] arm64: tegra: Add SDMMC sdr104-offsets for Tegra X1

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Message-Id: <20240923-sdr104-v1-1-ec7b3394f880@tecnico.ulisboa.pt>
Date: Mon, 23 Sep 2024 19:24:51 +0100
From: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>
Cc: devicetree@...r.kernel.org, linux-tegra@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
Subject: [PATCH] arm64: tegra: Add SDMMC sdr104-offsets for Tegra X1

Define the sdr104-specific offsets, preventing the driver from
defaulting to the 1.8V offsets, which cause the system to hang during
the SDR104 mode calibration.

The zeroing of these values was chosen since it restores functionality
and no better suggestions are provided by the Tegra X1 TRM.

Signed-off-by: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
---
 arch/arm64/boot/dts/nvidia/tegra210.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210.dtsi b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
index 882b1d1f4ada8d9e275e5a6bee633a21cc6cdb2d..942e3a0f81ed768021d2ac25f6369998a9fbfd76 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
@@ -1218,6 +1218,8 @@ mmc@...b0000 {
 		nvidia,pad-autocal-pull-down-offset-3v3 = <0x7d>;
 		nvidia,pad-autocal-pull-up-offset-1v8 = <0x7b>;
 		nvidia,pad-autocal-pull-down-offset-1v8 = <0x7b>;
+		nvidia,pad-autocal-pull-up-offset-sdr104 = <0x0>;
+		nvidia,pad-autocal-pull-down-offset-sdr104 = <0x0>;
 		nvidia,default-tap = <0x2>;
 		nvidia,default-trim = <0x4>;
 		assigned-clocks = <&tegra_car TEGRA210_CLK_SDMMC4>,

---
base-commit: de5cb0dcb74c294ec527eddfe5094acfdb21ff21
change-id: 20240923-sdr104-36cca57a9049

Best regards,
-- 
Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>