Hi Peter,

On 03.07.19 14:10, Peter Robinson wrote:
> Hi Stefan,
>
>>> loads but I don't get an error, just:
>>> bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver
>>>
>>> That's a minimal text only image, display attached but just at a linux
>>> console login.
>> Could you please so kind and make an ASCII table for the bad cases with
>> the following columns Raspberry Pi type, kernel, DTB, firmware and add
>> them to the github issue?
> Sorry, I've not had time to do all that testing across the matrix of
> devices, it will take some time and I have around 10 days of travel
> starting on Thursday.
>
> The first test I did do was one of my regular desktop testing devices
> which has consistently had the issue I did some testing. It's an
> original RPi 3B with Fedora 30 Workstation (GNOME).
>
> v5.2-rc7 - fails with the following errors, interesting no messages
> about vc4 driver at all.
>
> [    6.791023] bcm2835-power bcm2835-power: Broadcom BCM2835 power
> domains driver
> [   32.891912] bcm2835-power bcm2835-power: Timeout waiting for grafx power OK
> [   32.937340] bcm2835-power bcm2835-power: Timeout waiting for grafx power OK
could you please provide the RPi firmware version from dmesg?
>
> I then did a build, same kernel as above but with the bcm2835-power
> driver disabled:
> # CONFIG_BCM2835_POWER is not set
>
> No mention of bcm2835-power (as expected), and just this error from vc4:
> [   30.873633] vc4_v3d 3fc00000.v3d: ignoring dependency for device,
> assuming no driver
>
> Then with the same kernel as the last test (v5.2-rc7 bcm2835-power
> disabled) plus the following two DT patches reverted:
>
> e1dc2b2e1bef7237fd8fc055fe1ec2a6ff001f91 ARM: bcm283x: Switch V3D over
> to using the PM driver instead of firmware.
> 81fc035f07d230c0f687ef09d5ecf2c885dba8ae ARM: bcm283x: Extend the WDT
> DT node out to cover the whole PM block. (v4)

Yes, reverting those patches is the last option. But i only want go this
way, in case the new bcm2835 is really broken. Btw the RPi 4 relies on
this driver.

Since not all RPis are affected, it isn't clear to me what causes these
timeouts (timing, hardware tolerances, power supply, firmware version,
overclocking configuration).

> Let me know what else I can assist with and I'll en-devour to get it
> done before I leave for travel.
>
> Peter
>
> BTW what's the status of this slightly related patch going upstream
> (we did pull it in locally):
> https://patchwork.kernel.org/patch/10945031/

Apologize, i missed to add a Fixes tag. Except from this the patch has
been applied and will be in Linux 5.3:

https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git/commit/?h=watchdog-next&id=ff7d6b7a98c7d402a17085ae0c6d780ee3bae841

But i don't know why this branch isn't merged into linux-next.

Best regards
Stefan
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