linux-kernel - Re: [PATCH v5 5/7] MIPS: DTS: jz4780: Account for Synopsys HDMI driver and LCD controllers

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Date:   Tue, 9 Nov 2021 21:19:17 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Paul Boddie <paul@...die.org.uk>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Harry Wentland <harry.wentland@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maxime Ripard <maxime@...no.tech>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS 
        <devicetree@...r.kernel.org>,
        linux-mips <linux-mips@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>, Jon as Karlman <jonas@...boo.se>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v5 5/7] MIPS: DTS: jz4780: Account for Synopsys HDMI
 driver and LCD controllers

Hi Paul,

> Am 07.11.2021 um 20:05 schrieb Paul Cercueil <paul@...pouillou.net>:
> 
>> 6. Therefore I think it *may* work overclocked with 48MHz
>> but is not guaranteed or reliable above 27 MHz.
>> So everything is ok here.
> 
> One thing though - the "assigned-clocks" and "assigned-clock-rates", while it works here, should be moved to the CGU node, to respect the YAML schemas.

Trying to do this seems to break boot.

I can boot up to 

[    8.312926] dw-hdmi-ingenic 10180000.hdmi: registered DesignWare HDMI I2C bus driver

and

[   11.366899] [drm] Initialized ingenic-drm 1.1.0 20200716 for 13050000.lcdc0 on minor 0

but then the boot process becomes slow and hangs. Last sign of activity is

[   19.347659] hub 1-0:1.0: USB hub found
[   19.353478] hub 1-0:1.0: 1 port detected
[   32.321760] wlan0_power: disabling

What I did was to just move

		assigned-clocks = <&cgu JZ4780_CLK_HDMI>;
		assigned-clock-rates = <27000000>;

from

	hdmi: hdmi@...80000 {

to

	cgu: jz4780-cgu@...00000 {

Does this mean the clock is assigned too early or too late?

Do you have any suggestions since I don't know the details of CGU.

BR and thanks,
Nikolaus