linux-kernel - Re: [PATCH V8 0/7] drm: bridge: samsung-dsim: Support variable clocking

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Message-ID: <343dc13df7369ccee22f51852b3e8518e500025a.camel@pengutronix.de>
Date:   Thu, 08 Jun 2023 14:52:44 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Adam Ford <aford173@...il.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Cc:     Marek Vasut <marex@...x.de>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Robert Foss <rfoss@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonas Karlman <jonas@...boo.se>, linux-kernel@...r.kernel.org,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        aford@...conembedded.com, dri-devel@...ts.freedesktop.org,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH V8 0/7] drm: bridge: samsung-dsim: Support variable
 clocking

Am Donnerstag, dem 08.06.2023 um 07:30 -0500 schrieb Adam Ford:
> On Thu, Jun 8, 2023 at 6:40 AM Rasmus Villemoes
> <rasmus.villemoes@...vas.dk> wrote:
> > 
> > 
[...]
> > > Have you tried using modetest to see what refresh rates are available?
> > 
> > Hm. My userspace may be a little weird. When I run modetest I just get
> > 
> > trying to open device 'i915'...failed
> > trying to open device 'amdgpu'...failed
> > ...
> > trying to open device 'imx-dcss'...failed
> > trying to open device 'mxsfb-drm'...failed
> > no device found
> > 
> 
> One the 8MP, I think you need to append "-M imx-lcdif" to the modetest
> command  to specify the driver being used.
> I don't have my 8MP with me right now, but I think that's the right name.

That's correct. Alternatively update libdrm to >= 2.4.114, which knows
to look for this driver in the tests.

Regards,
Lucas