linux-kernel - [PATCH] dts: juno: Enable coresight tmc scatter gather in ETR

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Message-Id: <1536655641-26192-1-git-send-email-suzuki.poulose@arm.com>
Date:   Tue, 11 Sep 2018 09:47:21 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org,
        coresight@...ts.linaro.org, robert.walker@....com,
        devicetree@...r.kernel.org, robh@...nel.org,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        Lorenzo Pierlisi <lorenzo.pieralisi@....com>
Subject: [PATCH] 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@...aro.org>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Liviu Dudau <liviu.dudau@....com>
Cc: Lorenzo Pierlisi <lorenzo.pieralisi@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arch/arm64/boot/dts/arm/juno-base.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
index ce56a4a..3596e5d 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -199,6 +199,7 @@
 		clocks = <&soc_smc50mhz>;
 		clock-names = "apb_pclk";
 		power-domains = <&scpi_devpd 0>;
+		arm,scatter-gather;
 		port {
 			etr_in_port: endpoint {
 				slave-mode;
-- 
2.7.4