linux-kernel - [PATCH 1/2] arm64: dts: exynos: gs101: ufs: add dma-coherent property

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Message-Id: <20250314-ufs-dma-coherent-v1-1-bdf9f9be2919@linaro.org>
Date: Fri, 14 Mar 2025 15:38:02 +0000
From: Peter Griffin <peter.griffin@...aro.org>
To: André Draszik <andre.draszik@...aro.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Avri Altman <avri.altman@....com>, Bart Van Assche <bvanassche@....org>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-scsi@...r.kernel.org, kernel-team@...roid.com, 
 willmcvicker@...gle.com, Peter Griffin <peter.griffin@...aro.org>, 
 stable@...r.kernel.org
Subject: [PATCH 1/2] arm64: dts: exynos: gs101: ufs: add dma-coherent
 property

ufs-exynos driver configures the sysreg shareability as
cacheable for gs101 so we need to set the dma-coherent
property so the descriptors are also allocated cacheable.

This fixes the UFS stability issues we have seen with
the upstream UFS driver on gs101.

Fixes: 4c65d7054b4c ("arm64: dts: exynos: gs101: Add ufs and ufs-phy dt nodes")
Cc: stable@...r.kernel.org
Suggested-by: Will McVicker <willmcvicker@...gle.com>
Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
---
 arch/arm64/boot/dts/exynos/google/gs101.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
index c5335dd59dfe9fcf8c64d66a466799600f8447b0..cf30128ef004568f01b1c7150c5585ba267d64bc 100644
--- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
+++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
@@ -1360,6 +1360,7 @@ ufs_0: ufs@...00000 {
 				 <&cmu_hsi2 CLK_GOUT_HSI2_SYSREG_HSI2_PCLK>;
 			clock-names = "core_clk", "sclk_unipro_main", "fmp",
 				      "aclk", "pclk", "sysreg";
+			dma-coherent;
 			freq-table-hz = <0 0>, <0 0>, <0 0>, <0 0>, <0 0>, <0 0>;
 			pinctrl-0 = <&ufs_rst_n &ufs_refclk_out>;
 			pinctrl-names = "default";

-- 
2.49.0.rc1.451.g8f38331e32-goog