On Sun, Nov 21, 2021 at 7:25 AM Adam Ford [off-list ref] wrote:

quoted

On Sun, Nov 21, 2021 at 8:34 AM Adam Ford [off-list ref] wrote:

quoted

On Sun, Nov 21, 2021 at 8:21 AM Fabio Estevam [off-list ref] wrote:

quoted

Hi Adam,

On Sun, Nov 21, 2021 at 11:17 AM Adam Ford [off-list ref] wrote:

quoted

I am using https://source.codeaurora.org/external/imx/imx-atf/log/?h=lf_v2.4

Since the driver sending SMCC commands to ATF isn't doing that, I
assume it's safe to use the linux power-domain drivers with the ATF
from NXP's kernel.

If you can point me to the repo you think I should be using, I'll give it a try.

Do you know if the mainline TF-A repo v2.5 works too?
https://github.com/ARM-software/arm-trusted-firmware/tree/v2.5

That's good to know.

I just built it into U-Boot:

NOTICE:  BL31: v2.5(release):v2.5
NOTICE:  BL31: Built : 08:24:13, Nov 21 2021

The Etnaviv driver is still loading without hanging

root@beacon-imx8mn-kit:~# dmesg |grep -i etna
[   12.393936] etnaviv etnaviv: bound 38000000.gpu (ops gpu_ops [etnaviv])
[   12.400676] etnaviv-gpu 38000000.gpu: model: GC7000, revision: 6203
[   12.641297] [drm] Initialized etnaviv 1.3.0 20151214 for etnaviv on minor 0

Tim,

Which version of Nano do you have?  Not all Nano SoC's have a GPU from
looking at the datasheet [1] .  I am using MIMX8MN2CVTIZAA (Nano Solo)

[1] - https://www.nxp.com/docs/en/data-sheet/IMX8MNIEC.pdf

Adam,

The board I have here has MIMX8MN5CVTIZAA so i.MX 8M Nano QuadLite
with 'No GPU' as you expected.

So I have to add the following to keep my board from hanging after your series:

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts

b/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts
index 236f425e1570..0d256a607b7c 100644

--- a/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-venice-gw7902.dts

@@ -251,6 +251,10 @@
        };
 };

+&gpu {
+       status = "disabled";
+};
+
 &i2c1 {
        clock-frequency = <100000>;
        pinctrl-names = "default";

This situation is similar to the one I encountered with the
imx8mm-venice-gw7901 where adding the GPC node caused my board (which
did not power the GPU) to hang until I added disables to the
device-tree with commit 7973009235e2 ("arm64: dts:
imx8mm-venice-gw7901.dts: disable pgc_gpumix"). It feels painful to
have to add patches to keep things from hanging after additional
functionality is added to dt but perhaps that is more common than I
think esp for SoC's like IMX8M which have a lot of lingering support
still coming in.