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From: thierry.reding@gmail.com (Thierry Reding)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] drm/panel: simple: Add support for Innolux AT070TN92
Date: Sat, 23 Apr 2016 00:30:49 +0200	[thread overview]
Message-ID: <20160422223047.GA22161@mithrandir.ba.sec> (raw)
In-Reply-To: <877ffrp3fc.fsf@gmail.com>

On Thu, Apr 21, 2016 at 02:11:19PM +0200, Holger Schurig wrote:
> Thierry Reding <thierry.reding@gmail.com> writes:
> > Applied, thanks.
> 
> I once read that this is the recommended way to go, instead of
> specifying the timings in the device tree. Why is this so?  Any new
> display just increases the .text size of the kernel unnessary.

It's actually only the .rodata section that's increased every time we
add a new display panel.

> Did this idea stem from the era where bootloaders like Barebox couldn't
> modify the DT ad-hoc before handing it over to the kernel?

No, not really. But since this has come up every now and again I finally
wrote down my recollection and thoughts on the matter, hopefully that
will be satisfactory as an answer:

	http://sietch-tagr.blogspot.com/2016/04/display-panels-are-not-special.html

Thierry
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WARNING: multiple messages have this Message-ID (diff)
From: Thierry Reding <thierry.reding@gmail.com>
To: Holger Schurig <holgerschurig@gmail.com>
Cc: Riccardo Bortolato <bortolato@navaltechitalia.it>,
	Nicolas Ferre <nicolas.ferre@atmel.com>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Alexandre Belloni <alexandre.belloni@free-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] drm/panel: simple: Add support for Innolux AT070TN92
Date: Sat, 23 Apr 2016 00:30:49 +0200	[thread overview]
Message-ID: <20160422223047.GA22161@mithrandir.ba.sec> (raw)
In-Reply-To: <877ffrp3fc.fsf@gmail.com>


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On Thu, Apr 21, 2016 at 02:11:19PM +0200, Holger Schurig wrote:
> Thierry Reding <thierry.reding@gmail.com> writes:
> > Applied, thanks.
> 
> I once read that this is the recommended way to go, instead of
> specifying the timings in the device tree. Why is this so?  Any new
> display just increases the .text size of the kernel unnessary.

It's actually only the .rodata section that's increased every time we
add a new display panel.

> Did this idea stem from the era where bootloaders like Barebox couldn't
> modify the DT ad-hoc before handing it over to the kernel?

No, not really. But since this has come up every now and again I finally
wrote down my recollection and thoughts on the matter, hopefully that
will be satisfactory as an answer:

	http://sietch-tagr.blogspot.com/2016/04/display-panels-are-not-special.html

Thierry

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WARNING: multiple messages have this Message-ID (diff)
From: Thierry Reding <thierry.reding@gmail.com>
To: Holger Schurig <holgerschurig@gmail.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>,
	Riccardo Bortolato <bortolato@navaltechitalia.it>,
	David Airlie <airlied@linux.ie>,
	Nicolas Ferre <nicolas.ferre@atmel.com>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Alexandre Belloni <alexandre.belloni@free-electrons.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] drm/panel: simple: Add support for Innolux AT070TN92
Date: Sat, 23 Apr 2016 00:30:49 +0200	[thread overview]
Message-ID: <20160422223047.GA22161@mithrandir.ba.sec> (raw)
In-Reply-To: <877ffrp3fc.fsf@gmail.com>

[-- Attachment #1: Type: text/plain, Size: 859 bytes --]

On Thu, Apr 21, 2016 at 02:11:19PM +0200, Holger Schurig wrote:
> Thierry Reding <thierry.reding@gmail.com> writes:
> > Applied, thanks.
> 
> I once read that this is the recommended way to go, instead of
> specifying the timings in the device tree. Why is this so?  Any new
> display just increases the .text size of the kernel unnessary.

It's actually only the .rodata section that's increased every time we
add a new display panel.

> Did this idea stem from the era where bootloaders like Barebox couldn't
> modify the DT ad-hoc before handing it over to the kernel?

No, not really. But since this has come up every now and again I finally
wrote down my recollection and thoughts on the matter, hopefully that
will be satisfactory as an answer:

	http://sietch-tagr.blogspot.com/2016/04/display-panels-are-not-special.html

Thierry

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  reply	other threads:[~2016-04-22 22:30 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-20 13:37 [PATCH v2] drm/panel: simple: Add support for Innolux AT070TN92 Boris Brezillon
2016-04-20 13:37 ` Boris Brezillon
2016-04-20 13:37 ` Boris Brezillon
2016-04-20 13:40 ` Thierry Reding
2016-04-20 13:40   ` Thierry Reding
2016-04-20 13:40   ` Thierry Reding
2016-04-21 12:11   ` Holger Schurig
2016-04-21 12:11     ` Holger Schurig
2016-04-22 22:30     ` Thierry Reding [this message]
2016-04-22 22:30       ` Thierry Reding
2016-04-22 22:30       ` Thierry Reding

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