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

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Message-Id: <8F33BB1D-2210-421B-A788-8484C23DF4C6@goldelico.com>
Date: Sun, 19 Jan 2025 16:04:59 +0100
From: "H. Nikolaus Schaller" <hns@...delico.com>
To: wahrenst@....net
Cc: Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Florian Fainelli <f.fainelli@...il.com>,
 Ray Jui <rjui@...adcom.com>,
 Scott Branden <sbranden@...adcom.com>,
 devicetree <devicetree@...r.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 stable <stable@...r.kernel.org>,
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
 linux-rpi-kernel@...ts.infradead.org,
 arm-soc <linux-arm-kernel@...ts.infradead.org>,
 Discussions about the Letux Kernel <letux-kernel@...nphoenux.org>
Subject: Re: [PATCH v2] Revert v6.2-rc1 and later "ARM: dts: bcm2835-rpi: Use
 firmware clocks for display"

Hi Stefan,

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

BR and thanks,
Nikolaus