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

From: Lucas Stach <l.stach@pengutronix.de>
To: Adam Ford <aford173@gmail.com>,
	Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc: Marek Vasut <marex@denx.de>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Robert Foss <rfoss@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Jonas Karlman <jonas@kwiboo.se>,
	linux-kernel@vger.kernel.org,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	aford@beaconembedded.com, dri-devel@lists.freedesktop.org,
	Frieder Schrempf <frieder.schrempf@kontron.de>,
	devicetree@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Jagan Teki <jagan@amarulasolutions.com>,
	Andrzej Hajda <andrzej.hajda@intel.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH V8 0/7] drm: bridge: samsung-dsim: Support variable clocking
Date: Thu, 08 Jun 2023 14:52:44 +0200	[thread overview]
Message-ID: <343dc13df7369ccee22f51852b3e8518e500025a.camel@pengutronix.de> (raw)
In-Reply-To: <CAHCN7xKdKGA02=ZDNQkVVVDV0AZTqd7QpHA2Nq9LNnbmK=hKxA@mail.gmail.com>

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@prevas.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