linux-kernel - Re: [RFC 00/15] Resource tracking/allocation framework

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Date:	Wed, 10 Dec 2014 17:39:18 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	A H <andrzej.hajda@...il.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	"open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
	Mike Turquette <mturquette@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	"moderated list:ARM/S5P EXYNOS AR..." 
	<linux-samsung-soc@...r.kernel.org>,
	"moderated list:ARM/CLKDEV SUPPORT" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	open list <linux-kernel@...r.kernel.org>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [RFC 00/15] Resource tracking/allocation framework

On Wed, Dec 10, 2014 at 06:23:49PM +0100, A H wrote:
> 10 gru 2014 17:16 "Russell King - ARM Linux" <linux@....linux.org.uk>
> napisał(a):
> >
> > On Wed, Dec 10, 2014 at 04:48:18PM +0100, Andrzej Hajda wrote:
> > > 3. There are drivers which can work without specific resource, but if
> > >   the resource becomes available/unavailable it can do some additional
> stuff.
> > >   An example of such driver is DRM driver (more precisely
> drm_connector) -
> > >   it can start without attached drm_panel, but if the panel becomes
> available it
> > >   can react by generating HPD event and start using it.
> >
> > Bad example, and actually incorrect.  DRM connectors are referenced in
> > userspace by an IDR number, which can be re-used in the case of a
> > connector appearing, disappearing, and then a different connector
> > re-appearing.
> 
> But it is not about reappearing of drm_connector, it is about reappearing
> of drm_panel which is fortunately not a part of drm driver. Connector here
> is only consumer of drm_panel which should have possibility to receive
> notifications on panel (dis-)appearance.

Okay, so that's exactly like a panel being "hotplugged" to the connector,
which should be fine.

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