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: Sudeep Holla sudeep.holla@arm.com Cc: Liviu Dudau liviu.dudau@arm.com Cc: Lorenzo Pierlisi lorenzo.pieralisi@arm.com Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.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;