linux-kernel - Re: gma500: Cannot find any crtc or sizes

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Message-ID: <CAH9NwWdEkLceDv_6n=tGKK1VxmDs7J-QLa9g3hMzFDMAYnSYXw@mail.gmail.com>
Date:	Thu, 21 Jun 2012 10:54:08 +0200
From:	Christian Gmeiner <christian.gmeiner@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <greg@...ah.com>
Subject: Re: gma500: Cannot find any crtc or sizes - going 1024x768

2012/6/13 Christian Gmeiner <christian.gmeiner@...il.com>:
> 2012/6/13 Alan Cox <alan@...rguk.ukuu.org.uk>:
>>> My company is using these cpu bords for our products:
>>> http://www.congatec.com/en/products/qseven/dView/conga-qa6.html
>>>
>>> With firmware you mean BIOS or VBios or ...? If you tell me what you need, I may
>>> ask our supplier for more informations. I can tell you that the
>>> following options can be
>>> changed in the BIOS regarding gfx - see
>>> https://www.dropbox.com/s/btlciurz0ih4fhu/IMG_20120612_143431.jpg
>>
>> The basic question is:
>>
>> Does this device use the Intel BIOS way of reporting mode information,
>> or the embedded "GCT" style.
>>
>
> As far as I can tell from the logs, it seems to use the Intel BIOS way.
>
> [    2.366174] [drm:psb_intel_opregion_setup], Public ACPI methods supported
> [    2.366183] [drm:psb_intel_opregion_setup], ASLE supported
> [    2.366200] gma500 0000:00:02.0: Enabling MSI failed!
> [    2.366287] [drm] internal display is LVDS display
> [    2.366363] gma500 0000:00:02.0: SKU values is 0x2a00000.
> [    2.366371] gma500 0000:00:02.0: LNC core clk is 200MHz.
> [    2.366389] gma500 0000:00:02.0: drm platform config address is 3ddbd010
> [    2.366403] ioremap error for 0x3ddbd000-0x3ddbe000, requested 0x10, got 0x0
> [    2.366484] gma500 0000:00:02.0: Unable to read GCT!
> [    2.366563] gma500 0000:00:02.0: platform_rev_id is 5
> [    2.368471] gma500 0000:00:02.0: VBT signature missing
>
>
> I will ask my contact at congatec what they are really using. I hope
> to get some feedback soon.

So here is the feedback i got from congatec:

In general I should use the Intel Embedded Media and Graphic Driver as
this seems to work for other
customers. EMGD and VBIOS do not share any information's regarding
LVDS configuration.
So it looks like I need to generate the correct VBIOS and flash it
with a congatec utility onto the device.
And then the gma500 driver should find a VBIOS with VBT signature.

---
Christian Gmeiner, MSc
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