Re: vc4 on rpi3 A+

From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Sergey Suloev <ssuloev@orpaltech.com>,
	 linux-rpi-kernel@lists.infradead.org,
	Stefan Wahren <wahrenst@gmx.net>
Cc: "Noralf Trønnes" <noralf@tronnes.org>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: vc4 on rpi3 A+
Date: Fri, 28 Feb 2020 14:09:59 +0100	[thread overview]
Message-ID: <b71f1af17d68ee66a2781a694e8a77dcafedd76b.camel@suse.de> (raw)
In-Reply-To: <8b353626-f62a-2aff-96b4-91712ed36095@orpaltech.com>


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Hi Sergey,

On Thu, 2020-02-20 at 11:21 +0300, Sergey Suloev wrote:
> Hello, guys,
> 
> could anyone clarify the status of vc4 drm support on RPI 3A+ ?
> 
> I tried to build kernel 5.5 and 5.6-rc2 in 32bit and aarch64 
> configurations with VC4 turned ON but both unsuccessful - vc4 drm driver 
> is listed in memory but not working and not producing any typical DRM 
> log output.

I managed to get my hands on a rpi3a+ and reproduce the issue. 'dmesg -lerr'
outputs this:

	bcm2835-power: Timeout waiting for grafx power OK

This is a known issue, see https://github.com/raspberrypi/linux/issues/3046.
I attached a device-tree patch in case you want to verify it fixes the issue on
your board.

@Stefan I guess I'm going to have to revert the pm patch, any comments before I
do?

Regards,
Nicolas


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From e6d1aaab89af656fbb69845ce8ea8753059894a3 Mon Sep 17 00:00:00 2001
From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Date: Fri, 28 Feb 2020 14:03:22 +0100
Subject: [PATCH] HACK: ARM: dts: Use v3d's firmware based power domain on
 rpi3a+

temp fix...

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 arch/arm/boot/dts/bcm2835-common.dtsi      | 1 -
 arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts | 4 ++++
 2 files changed, 4 insertions(+), 1 deletion(-)

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@7ec00000 {
 			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/bcm2837-rpi-3-a-plus.dts b/arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts
index 66ab35eccba7..7fddede92b68 100644
--- a/arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts
+++ b/arch/arm/boot/dts/bcm2837-rpi-3-a-plus.dts
@@ -176,3 +176,7 @@ &uart1 {
 	pinctrl-0 = <&uart1_gpio14>;
 	status = "okay";
 };
+
+&v3d {
+	power-domains = <&power RPI_POWER_DOMAIN_V3D>;
+};
-- 
2.25.1


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