linux-kernel - Re: [PATCH] fb/intelfb: Do not depend on EMBEDDED

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Message-ID: <m3vdg6zeui.fsf@intrepid.localdomain>
Date:	Thu, 17 Dec 2009 00:19:49 +0100
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Dave Airlie <airlied@...ux.ie>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jean Delvare <jdelvare@...e.de>, Jeff Mahoney <jeffm@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fb/intelfb: Do not depend on EMBEDDED

Dave Airlie <airlied@...ux.ie> writes:

> Currently with the command line video=, this isn't optimal but still
> nobody has come up with a way to make fbset useful since it can't deal
> with multiple heads.

Ahh, now I can see it.

> also the old intelfb didn't deal with analog rgb tv at all.

Well... actually, it did: intelfb works very well if a correct mode is
set (a trivial patch adjusting the clock lower limit to 13.5 MHz may be
needed, or one can use the double clock and resolution, or maybe 1:1
pixel aspect ratio etc). It's not about the CH7xxx encoder, the TV is
connected directly to VGA output.

E.g.

# PAL 720x576, 50 Hz, Interlaced (13.5 MHz dotclock)
#
#                               Horizontal      Vertical
#       Resolution              720             576
#       Scan Frequency          15.625 kHz      50 Hz (I)
#       Sync Width              4.296 us        1.280 ms
#       Front Porch             1.000 us        0.256 ms
#       Back Porch              5.370 us        1.600 ms
#       Active Time             53.333 us       36.864 ms
#       Blank Time              10.667 us       3.136 ms
#       Polarity                Negative        Negative
#
#       H:      720 + 14 +  58 + 72 = 864
#       V:      576 +  4 +  20 + 25 = 625

mode "PAL"
        # D: 13.5 MHz, H: 15.625 kHz, V: 50 Hz
        geometry 720 576 720 576 32
        timings 74074 72 14 25 4 58 20
        laced true
        hsync low
        vsync low
endmode

"fbset PAL" is all one needs to use it.

(I know i915 doesn't have interlaced mode support for analog VGA out,
not a problem).
-- 
Krzysztof Halasa
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