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: <808a325f-81bc-4f5d-8c07-fa255ef2d25a@gmx.net>
Date: Sun, 19 Jan 2025 01:36:52 +0100
From: Stefan Wahren <wahrenst@....net>
To: "H. Nikolaus Schaller" <hns@...delico.com>,
 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>
Cc: Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, devicetree@...r.kernel.org,
 linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
 stable@...r.kernel.org
Subject: Re: [PATCH v2] Revert v6.2-rc1 and later "ARM: dts: bcm2835-rpi: Use
 firmware clocks for display"

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.

What kernel config do you use ?
What is the value of CONFIG_CLK_RASPBERRYPI ?

Best regards