From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: Tue, 11 Sep 2018 08:47:21 +0000 (+0100)
Subject: arm64: dts: juno: Enable coresight tmc scatter gather in ETR
X-Git-Tag: v4.20-rc1~66^2~54^2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=79daf2a4089f6a817e5e0202362cdc764b535561;p=users%2Fjedix%2Flinux-maple.git

arm64: dts: juno: Enable coresight tmc scatter gather in ETR

We do not enable scatter-gather mode in the TMC-ETR by default
to prevent malfunctioning of systems where the ETR may not be
properly connected to the memory subsystem to allow for simultaneous
READ/WRITE transactions when used in SG mode. Instead we whitelist
the platforms where we know that it is safe to use the mode.

All revisions of Juno have a proper ETR connection and hence
white list them.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Lorenzo Pierlisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---

diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
index a418193603df1..ed774ee8f6594 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -193,6 +193,7 @@
 		clocks = <&soc_smc50mhz>;
 		clock-names = "apb_pclk";
 		power-domains = <&scpi_devpd 0>;
+		arm,scatter-gather;
 		in-ports {
 			port {
 				etr_in_port: endpoint {