linux-kernel - Re: [PATCH 2/2] framebuffer: Remove pmag-aa-fb

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Message-ID: <1381594098.8864.9.camel@joe-AO722>
Date:	Sat, 12 Oct 2013 09:08:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>
Subject: Re: [PATCH 2/2] framebuffer: Remove pmag-aa-fb

On Sat, 2013-10-12 at 14:08 +0100, Maciej W. Rozycki wrote:
[]
> So I think I've got all the basic stuff covered now, including a change 
> similar to your proposal as well as a conversion to the driver model/new 
> TURBOchannel support infrastructure.  But what I remembered is actually 
> right, the issue is wiring hardware cursor support into fbcon.  The driver 
> uses its own display_switch structure with its own aafbcon_cursor handler 
> to use the twin onboard Bt431 chips for cursor generation (there's also 
> aafbcon_set_font that pokes at the Bt431s for cursor dimension changes).  
> I need to figure out what the best way will be to make the fbcon subsystem 
> support such an arrangement and that'll take me a little bit yet, so 
> please be patient.
> 
> Note that the board is weird enough to have a 1-bit (true monochrome) 
> graphics plane, however the Bt455 used by the MX graphics adapter for 
> screen image generation is a 4-bit grey-scale video RAMDAC (only the LSB 
> inputs of its pixel port are wired to the graphics plane) and the twin 
> Bt431s use the overlay plane to produce a 2-bit grey-scale cursor.  So we 
> do want to use the hardware cursor to be able to make it prominent among 
> the characters displayed throughout the screen and a software-generated 
> cursor cannot really substitute what hardware provides.

I hope you're enjoying tinkering with old toys.

Best of luck getting it going.


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