From 9d1a8ad3c56f4e84a0ec46246b4c08a6d139f638 Mon Sep 17 00:00:00 2001
From: Peter Robinson <pbrobinson@gmail.com>
Date: Sun, 13 Oct 2019 14:33:23 +0100
Subject: [PATCH] Revert "ARM: bcm283x: Switch V3D over to using the PM driver
 instead of firmware."

Since release of the new BCM2835 PM driver there has been several reports
of V3D probing issues. This is caused by timeouts during powering-up the
GRAFX PM domain:

  bcm2835-power: Timeout waiting for grafx power OK

I was able to reproduce this reliable on my Raspberry Pi 3B+ after setting
force_turbo=1 in the firmware configuration. Since there are no issues
using the firmware PM driver with the same setup, there must be an issue
in the BCM2835 PM driver.

Unfortunately there hasn't been much progress in identifying the root cause
since June (mostly in the lack of documentation), so i decided to switch
back until the issue in the BCM2835 PM driver is fixed.

Link: https://github.com/raspberrypi/linux/issues/3046
Fixes: e1dc2b2e1bef (" ARM: bcm283x: Switch V3D over to using the PM driver instead of firmware.")
Cc: stable@vger.kernel.org
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Eric Anholt <eric@anholt.net>
---
 a/arch/arm/boot/dts/bcm2835-rpi.dtsi | 4 ++++
 b/arch/arm/boot/dts/bcm283x.dtsi     | 4 +---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index 715d50c64529..d136867c317f 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -90,6 +90,10 @@
 	status = "okay";
 };
 
+&v3d {
+	power-domains = <&power RPI_POWER_DOMAIN_V3D>;
+};
+
 &vec {
 	power-domains = <&power RPI_POWER_DOMAIN_VEC>;
 	status = "okay";
diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
index 4b21ddb26aa5..0c6a6611f285 100644
--- a/arch/arm/boot/dts/bcm283x.dtsi
+++ b/arch/arm/boot/dts/bcm283x.dtsi
@@ -3,7 +3,6 @@
 #include <dt-bindings/clock/bcm2835-aux.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/irq.h>
-#include <dt-bindings/soc/bcm2835-pm.h>
 
 /* firmware-provided startup stubs live here, where the secondary CPUs are
  * spinning.
@@ -121,7 +120,7 @@
 			#interrupt-cells = <2>;
 		};
 
-		pm: watchdog@7e100000 {
+		watchdog@7e100000 {
 			compatible = "brcm,bcm2835-pm", "brcm,bcm2835-pm-wdt";
 			#power-domain-cells = <1>;
 			#reset-cells = <1>;
@@ -641,7 +640,6 @@
 			compatible = "brcm,bcm2835-v3d";
 			reg = <0x7ec00000 0x1000>;
 			interrupts = <1 10>;
-			power-domains = <&pm BCM2835_POWER_DOMAIN_GRAFX_V3D>;
 		};
 
 		vc4: gpu {
-- 
2.21.0