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+From patchwork Tue Oct 16 14:00:20 2018
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+X-Patchwork-Submitter: Daniel Lezcano <daniel.lezcano@linaro.org>
+X-Patchwork-Id: 1000432
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+ Tue, 16 Oct 2018 07:01:19 -0700 (PDT)
+From: Daniel Lezcano <daniel.lezcano@linaro.org>
+To: heiko@sntech.de
+Cc: linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
+ Mark Rutland <mark.rutland@arm.com>,
+ Vicente Bergas <vicencb@gmail.com>,
+ Shawn Lin <shawn.lin@rock-chips.com>,
+ Ezequiel Garcia <ezequiel@collabora.com>,
+ Enric Balletbo i Serra <enric.balletbo@collabora.com>,
+ Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
+ devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
+ DEVICE TREE BINDINGS),
+ linux-arm-kernel@lists.infradead.org (moderated list:ARM/Rockchip SoC
+ support),
+ linux-rockchip@lists.infradead.org (open list:ARM/Rockchip SoC
+ support)
+Subject: [PATCH] DT: rockchip: Fix stability issues with the 'performance'
+ governor on rock960
+Date: Tue, 16 Oct 2018 16:00:20 +0200
+Message-Id: <1539698431-12616-1-git-send-email-daniel.lezcano@linaro.org>
+X-Mailer: git-send-email 2.7.4
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+List-ID: <linux-kernel.vger.kernel.org>
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+
+When the performance governor is set as default, the rock960 hangs
+around one minute after booting, whatever the activity is (idle, key
+pressed, loaded, ...).
+
+Based on the commit log found at https://patchwork.kernel.org/patch/10092377/
+
+"vdd_log has no consumer and therefore will not be set to a specific
+voltage. Still the PWM output pin gets configured and thence the vdd_log
+output voltage will changed from it's default. Depending on the idle
+state of the PWM this will slightly over or undervoltage the logic supply
+of the RK3399 and cause instability with GbE (undervoltage) and PCIe
+(overvoltage). Since the default value set by a voltage divider is the
+correct supply voltage and we don't need to change it during runtime we
+remove the rail from the devicetree completely so the PWM pin will not
+be configured."
+
+After removing the vdd-log from the rock960's specific DT, the board
+does no longer hang and shows a stable behavior.
+
+Apply the same change for the rock960 by removing the vdd-log from the
+DT.
+
+Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
+Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+---
+ arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi | 12 ------------
+ 1 file changed, 12 deletions(-)
+
+diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
+index 6c8c4ab..56abbb0 100644
+--- a/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
++++ b/arch/arm64/boot/dts/rockchip/rk3399-rock960.dtsi
+@@ -57,18 +57,6 @@
+ regulator-always-on;
+ vin-supply = <&vcc_sys>;
+ };
+-
+- vdd_log: vdd-log {
+- compatible = "pwm-regulator";
+- pwms = <&pwm2 0 25000 0>;
+- regulator-name = "vdd_log";
+- regulator-min-microvolt = <800000>;
+- regulator-max-microvolt = <1400000>;
+- regulator-always-on;
+- regulator-boot-on;
+- vin-supply = <&vcc_sys>;
+- };
+-
+ };
+
+ &cpu_l0 {