linux-kernel - Re: [PATCH 0/2] drm: add SimpleDRM driver

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Message-ID: <20160804141525.GC4256@skynet.be>
Date:	Thu, 4 Aug 2016 16:15:25 +0200
From:	Luc Verhaegen <libv@...net.be>
To:	Noralf Trønnes <noralf@...nnes.org>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] drm: add SimpleDRM driver

On Thu, Aug 04, 2016 at 04:03:18PM +0200, Noralf Trønnes wrote:
> 
> I have tested simpledrm on a Raspberry Pi B+ with U-boot setting up the
> framebuffer and producing this node:
> 
>         framebuffer@...87000 {
>                 compatible = "simple-framebuffer";
>                 reg = <0x1e887000 0x36c600>;
>                 format = "r5g6b5";
>                 width = <1824>;
>                 height = <984>;
>                 stride = <3648>;
>                 status = "okay";
>         };
> 
> I have only tested with fbcon and modetest (XR24,RG16).

Please do not make the same mistake as simplefb in making this purely a 
rpifb. Know that you will need some power and clock management for 
properly free devices that do not depend on a binary only RTOS which 
does _everything_ behind our backs.

Cfr this useless, endless and ridiculous discussion: 
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-August/279071.html

Luc Verhaegen.