From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suzuki K Poulose Subject: [PATCH] dts: juno: Enable coresight tmc scatter gather in ETR Date: Tue, 11 Sep 2018 09:47:21 +0100 Message-ID: <1536655641-26192-1-git-send-email-suzuki.poulose@arm.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org, coresight@lists.linaro.org, robert.walker@arm.com, devicetree@vger.kernel.org, robh@kernel.org, Suzuki K Poulose , Mike Leach , Sudeep Holla , Liviu Dudau , Lorenzo Pierlisi List-Id: devicetree@vger.kernel.org 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 Cc: Mike Leach Cc: Sudeep Holla Cc: Liviu Dudau Cc: Lorenzo Pierlisi Signed-off-by: Suzuki K Poulose --- 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