Re: [PATCH v2] Revert v6.2-rc1 and later "ARM: dts: bcm2835-rpi: Use firmware clocks for display"

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On 1/19/2025 7:04 AM, 'H. Nikolaus Schaller' via BCM-KERNEL-FEEDBACK-LIST,PDL wrote:
Hi Stefan,

Am 19.01.2025 um 01:36 schrieb Stefan Wahren <wahrenst@xxxxxxx>:

Hi,

Am 18.01.25 um 17:27 schrieb H. Nikolaus Schaller:
This reverts commit 27ab05e1b7e5c5ec9b4f658e1b2464c0908298a6.

I tried to upgrade a RasPi 3B+ with Waveshare 7inch HDMI LCD
from 6.1.y to 6.6.y but found that the display is broken with
this log message:

[   17.776315] vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_drm_unregister [vc4])
[   17.784034] platform 3f806000.vec: deferred probe pending

Some tests revealed that while 6.1.y works, 6.2-rc1 is already broken but all
newer kernels as well. And a bisect did lead me to this patch.
I successfully tested every Kernel release until Linux 6.13-rc with the
Raspberry Pi 3B+, so i prefer to step back and analyze this issue further.

Yes, I would be happy with any solution.

What kernel config do you use ?

a private one which enables application specific drivers.

What is the value of CONFIG_CLK_RASPBERRYPI ?

CONFIG_CLK_RASPBERRYPI is not set

I checked where this is defined and it is in bcm2835_defconfig and
multi_v7_defconfig by

4c6f5d4038af2c ("ARM: defconfig: enable cpufreq driver for RPi")

which hides this requirement quite well and got therefore unnoticed...

Setting CONFIG_CLK_RASPBERRYPI=y makes HDMI work without my proposed revert.
Tested with v6.2.16, v6.6.72, v6.12.10 and v6.13-rc7.

I have been burned before by something similar and came up with this patch series that I should resubmit after addressing Conor's comment:

https://lore.kernel.org/all/20240513235234.1474619-1-florian.fainelli@xxxxxxxxxxxx/

Essentially, it removes the guess work, all you have to do is enable CONFIG_ARCH_BCM2835 and it just works, which is how it should be IMHO.
--
Florian





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