From: roman@hodek.net
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org, patrik.r.jakobsson@gmail.com,
christian.gmeiner@gmail.com
Subject: Re: SDVO on E6xx
Date: Wed, 21 Nov 2012 17:38:08 +0100 [thread overview]
Message-ID: <20121121163808.426108@zweiblum.hodek.net> (raw)
In-Reply-To: <20121121145027.4dce136d@pyramind.ukuu.org.uk>
Hi Alan,
> There is an Intel driver with open kernel code and proprietary userspace for
> the Imagination 3D engine (EMGD) although only for an out of maintenance
> Fedora and for Meego and in both cases for ancient kernels.
I knew about EMGD, but not that there's code available for parts of it.
> The fully open driver is built by extracting the relevant information and
> code from these releases.
Ah, ok. Then I'll try to extract even a bit more ;-) Thanks very much for that
hint!
> If you unpack that it contains a tar ball which you can unpack which
> contains the driver.
>
> emgd/pal/sdvo
>
> looks kind of promising.
Got it now (it's common/drm/emgd_drm.tgz).
I started to look around there, and emgd/display/pi/tnc/i2c_gmbus_tnc.c looks
as a good source of infos. At least it mentions E6xx quite often, and it uses
functions read/write_mmio_reg_tnc on TunnelCreek.
>From there I got to an interesting comment:
#ifdef CONFIG_TNC
/* Based on display port determine which mmio base to use:
* port_type == SDVO ==> use 0:3:0 device mmio
* port_type == LVDS ==> use 0:2:0 device mmio
* port_type == LPC ==> use 0:31:0 device mmio
*/
Indeed, I have those additional PCI devices, and the BARs of 0:03.0 look much
like those of 0:02.0. It has PCI ID 8086:8182 and class 0x0400
(multimedia/video). And in BAR 0 at offset 0x5100 there are values that look
more like GMBUS...
(0:1f.0 exists, it declares itself as ISA bridge, and it has no BARs
assigned.)
Ok, I'll go down that road, poke around a bit there, and we'll see how far I
can get!
Roman
prev parent reply other threads:[~2012-11-21 16:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-21 14:04 roman
2012-11-21 14:50 ` Alan Cox
2012-11-21 16:38 ` roman [this message]
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