linux-kernel - [PATCH 8/9] arm64: dts: qcom: msm8916/39: Move mpss

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Date:   Mon, 11 Sep 2023 19:41:50 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH 8/9] arm64: dts: qcom: msm8916/39: Move mpss_mem size to
 boards

The modem firmware size is typically highly device-specific.
The current size of the mpss_mem region in msm8916.dtsi (0x2b00000)
only works for some APQ8016 devices without full-featured modem,
such as the DragonBoard 410c.

The full modem firmware is typically about twice as large (~45 MiB
-> ~90 MiB) but also varies by a few MiB from device to device. Since
these devices are quite memory-constrained nowadays it's important to
minimize the unnecessary memory reservations.

Make it clear that each board needs to specify the necessary mpss_mem
size by replacing the DB410c-specific size in msm8916.dtsi with a
simple comment. &mpss_mem is disabled by default so it's fine to leave
some properties up to the boards if they want to enable it.

Signed-off-by: Stephan Gerhold <stephan@...hold.net>
---
 arch/arm64/boot/dts/qcom/apq8016-sbc.dts | 1 +
 arch/arm64/boot/dts/qcom/msm8916.dtsi    | 2 +-
 arch/arm64/boot/dts/qcom/msm8939.dtsi    | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dts b/arch/arm64/boot/dts/qcom/apq8016-sbc.dts
index ae510c5ec830..3381550a5c9e 100644
--- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dts
+++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dts
@@ -263,6 +263,7 @@ &mpss {
 
 &mpss_mem {
 	status = "okay";
+	reg = <0x0 0x86800000 0x0 0x2b00000>;
 };
 
 &pm8916_codec {
diff --git a/arch/arm64/boot/dts/qcom/msm8916.dtsi b/arch/arm64/boot/dts/qcom/msm8916.dtsi
index 8457472c9ad8..4d867078388d 100644
--- a/arch/arm64/boot/dts/qcom/msm8916.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8916.dtsi
@@ -84,7 +84,7 @@ mpss_mem: mpss@...00000 {
 			 * alignment = <0x0 0x400000>;
 			 * alloc-ranges = <0x0 0x86800000 0x0 0x8000000>;
 			 */
-			reg = <0x0 0x86800000 0x0 0x2b00000>;
+			reg = <0x0 0x86800000 0x0 0>; /* size is device-specific */
 			no-map;
 			status = "disabled";
 		};
diff --git a/arch/arm64/boot/dts/qcom/msm8939.dtsi b/arch/arm64/boot/dts/qcom/msm8939.dtsi
index c50f6d828fed..ba177725f3d7 100644
--- a/arch/arm64/boot/dts/qcom/msm8939.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8939.dtsi
@@ -356,7 +356,7 @@ mpss_mem: mpss@...00000 {
 			 * alignment = <0x0 0x400000>;
 			 * alloc-ranges = <0x0 0x86800000 0x0 0x8000000>;
 			 */
-			reg = <0x0 0x86800000 0x0 0x5500000>;
+			reg = <0x0 0x86800000 0x0 0>; /* size is device-specific */
 			no-map;
 			status = "disabled";
 		};

-- 
2.42.0