From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Benoit Parrot <bparrot@ti.com>, Rob Herring <robh+dt@kernel.org>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>,
devicetree@vger.kernel.org, Jyri Sarha <jsarha@ti.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [Patch 2/4] dt-bindings: display/ti: Add plane binding to dispc node
Date: Wed, 14 Mar 2018 13:23:37 +0200 [thread overview]
Message-ID: <283b6aea-d262-42ec-5e41-294b02b062c5@ti.com> (raw)
In-Reply-To: <20180309182751.GC31988@ti.com>
On 09/03/18 20:27, Benoit Parrot wrote:
>> Is logical plane a h/w concept?
>
> It does represent a hardware resource.
Logical plane is not a hw concept, it just describes a group of one or
two HW planes. Then again, in the context of 2k+ displays, two HW planes
must always be used together, so that way it could be considered a
single HW resource.
>> Really, I'm skeptical that any of this belongs in DT. For example,
>> can't you figure out you need 2 physical planes whenever your
>> panel/timing width is greater than 2048?
>
> As stated in the description I added above, we cannot have resources
> exposed to user-space which can "disappear" dynamically.
> Doing so would break user-space applications which rely on these
> resources.
The question is, if not in DT, then where? I agree that this is not
exactly describing the HW. But it can't be done dynamically either (or
at least we have not figured out a way). And it must be user configurable.
Module parameters are an option, but it would be somewhat difficult to
give all this information there. And also, if your board has a 2k+
display, you must have these configurations given to the driver, it's
not optional.
And while it's perhaps stretching the definitions a bit, I guess one
could argue that this describes the HW in a way: it describes how the HW
resources must be used if you have a display of 2k+ width, and is not as
such related to Linux or DRM.
Tomi
--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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next prev parent reply other threads:[~2018-03-14 11:23 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-02 13:48 [Patch 0/4] drm/omap: Add virtual-planes support Benoit Parrot
2018-03-02 13:48 ` [Patch 1/4] dt-bindings: display/ti: Move common dispc bindings to omap-dss.txt Benoit Parrot
2018-03-07 20:26 ` Rob Herring
2018-03-02 13:48 ` [Patch 2/4] dt-bindings: display/ti: Add plane binding to dispc node Benoit Parrot
2018-03-02 19:19 ` Rob Herring
2018-03-09 18:27 ` Benoit Parrot
2018-03-14 11:23 ` Tomi Valkeinen [this message]
2018-03-19 0:06 ` Rob Herring
2018-03-19 7:15 ` Tomi Valkeinen
2018-03-23 1:23 ` Rob Herring
2018-03-23 7:53 ` Tomi Valkeinen
2018-04-09 18:17 ` Rob Herring
2018-04-17 14:37 ` Tomi Valkeinen
2018-04-19 6:34 ` Daniel Vetter
2018-04-19 7:11 ` Tomi Valkeinen
2018-04-20 7:00 ` Daniel Vetter
2018-04-20 7:21 ` Tomi Valkeinen
2018-04-20 8:08 ` Daniel Vetter
2018-03-02 13:48 ` [Patch 3/4] drm/omap: Add virtual plane DT parsing support Benoit Parrot
2018-03-14 11:11 ` Tomi Valkeinen
2018-03-02 13:48 ` [Patch 4/4] drm/omap: Add virtual plane support to omap_plane Benoit Parrot
2018-03-14 11:56 ` Tomi Valkeinen
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