linux-kernel - Re: [PATCH] ARM: dts: bcm283x: Use firmware PM driver for V3D

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Date:   Tue, 3 Mar 2020 19:17:03 +0100
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Eric Anholt <eric@...olt.net>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        wahrenst@....net, linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: bcm283x: Use firmware PM driver for V3D

Hi Nicolas,

Am 03.03.20 um 18:32 schrieb Nicolas Saenz Julienne:
> The register based driver turned out to be unstable, specially on RPi3a+
> but not limited to it. While a fix is being worked on, we roll back to
> using firmware based scheme.
>
> Fixes: e1dc2b2e1bef ("ARM: bcm283x: Switch V3D over to using the PM driver instead of firmware")
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> ---
>
> See https://github.com/raspberrypi/linux/issues/3046 for more reference.
> Note: I tested this on RPi3b, RPi3a+ and RPi2b.

as i already wrote this prevent X to start on current Raspbian on my
Raspberry Pi 3A+ (multi_v7_defconfig, no u-boot). We must be careful here.

I will take a look at the debug UART. Maybe there are more helpful
information.

Regards
Stefan

>
>  arch/arm/boot/dts/bcm2835-common.dtsi     |  1 -
>  arch/arm/boot/dts/bcm2835-rpi-common.dtsi | 12 ++++++++++++
>  arch/arm/boot/dts/bcm2835.dtsi            |  1 +
>  arch/arm/boot/dts/bcm2836.dtsi            |  1 +
>  arch/arm/boot/dts/bcm2837.dtsi            |  1 +
>  5 files changed, 15 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm/boot/dts/bcm2835-rpi-common.dtsi
>
> diff --git a/arch/arm/boot/dts/bcm2835-common.dtsi b/arch/arm/boot/dts/bcm2835-common.dtsi
> index 2b1d9d4c0cde..4119271c979d 100644
> --- a/arch/arm/boot/dts/bcm2835-common.dtsi
> +++ b/arch/arm/boot/dts/bcm2835-common.dtsi
> @@ -130,7 +130,6 @@ v3d: v3d@...00000 {
>  			compatible = "brcm,bcm2835-v3d";
>  			reg = <0x7ec00000 0x1000>;
>  			interrupts = <1 10>;
> -			power-domains = <&pm BCM2835_POWER_DOMAIN_GRAFX_V3D>;
>  		};
>  
>  		vc4: gpu {
> diff --git a/arch/arm/boot/dts/bcm2835-rpi-common.dtsi b/arch/arm/boot/dts/bcm2835-rpi-common.dtsi
> new file mode 100644
> index 000000000000..b78a57534611
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm2835-rpi-common.dtsi
> @@ -0,0 +1,12 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * This include file covers the common peripherals and configuration between
> + * bcm2835, bcm2836 and bcm2837 implementations that interact with RPi's
> + * firmware interface.
> + */
> +
> +#include <dt-bindings/power/raspberrypi-power.h>
> +
> +&v3d {
> +	power-domains = <&power RPI_POWER_DOMAIN_V3D>;
> +};
> diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
> index 53bf4579cc22..0549686134ea 100644
> --- a/arch/arm/boot/dts/bcm2835.dtsi
> +++ b/arch/arm/boot/dts/bcm2835.dtsi
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  #include "bcm283x.dtsi"
>  #include "bcm2835-common.dtsi"
> +#include "bcm2835-rpi-common.dtsi"
>  
>  / {
>  	compatible = "brcm,bcm2835";
> diff --git a/arch/arm/boot/dts/bcm2836.dtsi b/arch/arm/boot/dts/bcm2836.dtsi
> index 82d6c4662ae4..b390006aef79 100644
> --- a/arch/arm/boot/dts/bcm2836.dtsi
> +++ b/arch/arm/boot/dts/bcm2836.dtsi
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  #include "bcm283x.dtsi"
>  #include "bcm2835-common.dtsi"
> +#include "bcm2835-rpi-common.dtsi"
>  
>  / {
>  	compatible = "brcm,bcm2836";
> diff --git a/arch/arm/boot/dts/bcm2837.dtsi b/arch/arm/boot/dts/bcm2837.dtsi
> index 9e95fee78e19..0199ec98cd61 100644
> --- a/arch/arm/boot/dts/bcm2837.dtsi
> +++ b/arch/arm/boot/dts/bcm2837.dtsi
> @@ -1,5 +1,6 @@
>  #include "bcm283x.dtsi"
>  #include "bcm2835-common.dtsi"
> +#include "bcm2835-rpi-common.dtsi"
>  
>  / {
>  	compatible = "brcm,bcm2837";