linux-kernel - Re: [RFC 1/6] drm: Add top level Kconfig option for DRM fbdev emulation

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Message-ID: <CAF6AEGv0H_wSU-hU-YfmtV3VqJ_U4zFGL+WG6ha3NhfxFG-Waw@mail.gmail.com>
Date:	Fri, 3 Jul 2015 09:33:13 -0400
From:	Rob Clark <robdclark@...il.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Daniel Vetter <daniel@...ll.ch>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>,
	Thierry Reding <treding@...dia.com>
Subject: Re: [RFC 1/6] drm: Add top level Kconfig option for DRM fbdev emulation

On Fri, Jul 3, 2015 at 8:32 AM, Thierry Reding <thierry.reding@...il.com> wrote:
> On Tue, Jun 30, 2015 at 11:04:45AM +0200, Daniel Vetter wrote:
>> On Tue, Jun 30, 2015 at 10:31 AM, Benjamin Gaignard
>> <benjamin.gaignard@...aro.org> wrote:
>> > I think that what have been done by Rob with module_param is also a good idea:
>> > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/gpu/drm/msm/msm_drv.c?id=e90dfec78ec288d6c89a7b508a5c5d4ae8b7f934
>> >
>> > Can you mix compilation flag and module param ?
>>
>> Hm, the point of the kconfig is to not require all the legacy baggage
>> from fbdev. But I guess a module option could be added later on too.
>> bochs has it too.
>
> I think the option would primarily be useful for testing. I've often
> needed to test modesetting code without fbdev getting in the way and the
> only way to currently do that is by recompiling with legacy fbdev
> disabled. The option would allow an fbdev-enabled kernel to be used but
> disable the fbdev code if desired.

and for debugging.. when things are going wrong it's nice for the
first modeset to not happen under console_lock ;-)

BR,
-R

> Thierry
>
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> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
>
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