linux-kernel - Re: [RFC v2 6/8] gpu: drm: tegra: Remove redundant host1x

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Date:	Fri, 21 Dec 2012 08:31:18 +0200
From:	Terje Bergström <tbergstrom@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Thierry Reding <thierry.reding@...onic-design.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arto Merilainen <amerilainen@...dia.com>
Subject: Re: [RFC v2 6/8] gpu: drm: tegra: Remove redundant host1x

On 21.12.2012 00:28, Stephen Warren wrote:
> On 12/20/2012 02:34 PM, Terje Bergström wrote:
>> On 20.12.2012 22:30, Thierry Reding wrote:
>>> The problem with your proposed solution is that, even any of Stephen's
>>> valid objections aside, it won't work. Once the tegra-drm module is
>>> unloaded, the driver's data will be left in the current state and the
>>> link to the dummy device will be lost.
>>
>> The dummy device is created by tegradrm's module init, because it's used
> 
> No, the tegradrm driver object might be registered by tegradrm's module
> init, but the dummy tegradrm platform device would need to be
> created/registered by host1x's probe. Otherwise, the device would get
> created even if there was no host1x/... in the system (disabled for some
> reason, multi-SoC kernel, ...)

Oh. I was all the time thinking that dummy device needs to be created by
tegradrm, because it's only used by tegradrm.  But as we're mixing the
responsibilities, we might then just as well go all the way.

Terje
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