linux-kernel - [PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c-navigation-mezzanine: Drop CMA heap

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Message-Id: <20250227-qcom-nonroot-overlays-v2-2-bde44f708cbe@trvn.ru>
Date: Thu, 27 Feb 2025 19:26:49 +0500
From: Nikita Travkin <nikita@...n.ru>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Nikita Travkin <nikita@...n.ru>
Subject: [PATCH v2 2/2] arm64: dts: qcom:
 sdm845-db845c-navigation-mezzanine: Drop CMA heap

Initially added, the cma heap was supposed to help with libcamera swisp,
however a mistake was made such that the node was never applied as part
of the overlay since the change was added to the overlay root ("/") and
not with a reference to the target dtb root ("&{/}"). Moveover libcamera
doesn't require CMA heap on Qualcomm platforms anymore as it can now use
UDMA buffers instead.

Drop the CMA heap node. This change has no effect on the final dtb.

This reverts commit d40fd02c1faf8faad57a7579b573bc5be51faabe.

Fixes: d40fd02c1faf ("arm64: dts: qcom: sdm845-db845c-navigation-mezzanine: Add cma heap for libcamera softisp support")
Suggested-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Signed-off-by: Nikita Travkin <nikita@...n.ru>
---
 .../boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso     | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso b/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
index 59970082da45203311146cc5249298f6188bf67a..51f1a4883ab8f0ee7c66fab89c6e1a88c868d2f8 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
+++ b/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
@@ -9,17 +9,6 @@
 #include <dt-bindings/clock/qcom,camcc-sdm845.h>
 #include <dt-bindings/gpio/gpio.h>
 
-/ {
-	reserved-memory {
-		linux,cma {
-			compatible = "shared-dma-pool";
-			size = <0x0 0x8000000>;
-			reusable;
-			linux,cma-default;
-		};
-	};
-};
-
 &camss {
 	vdda-phy-supply = <&vreg_l1a_0p875>;
 	vdda-pll-supply = <&vreg_l26a_1p2>;

-- 
2.48.1