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

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Message-ID: <CAMeQTsbAxToYhP4T+PRsaTq-wrX4yCprM=jCfK8NRWi21Avzvw@mail.gmail.com>
Date:	Tue, 12 Jun 2012 21:09:26 +0200
From:	Patrik Jakobsson <patrik.r.jakobsson@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Christian Gmeiner <christian.gmeiner@...il.com>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <greg@...ah.com>
Subject: Re: gma500: Cannot find any crtc or sizes - going 1024x768

On Tue, Jun 12, 2012 at 6:04 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
>> Was there a special reason for 0x4108 to be left out in the IS_MRST macro?
>> To me it looks like the bitmask should have been updated in commit:
>>
>> gma500: Add the E6xx PCI identifier we are missing
>> 56125db1eecf8d34d84f7925686110d90724edf0
>>
>> If this is the case, I'll send a proper patch since this also applies to
>> stable 3.3.x and 3.4.x
>
> Firstly it should never matter - there are no Moorestown devices in
> circulation. E600T is very similar to Oaktrail.
>
> So the real question here seems to be why does the IS_MRST macro matter.
> What weird firmware is involved here ?

It matters because everything between 0x4100 - 0x4107 are Moorestown if you ask
the macro, but are assigned to oaktrail_chip_ops. That makes Oaktrail ==
Moorestown. IS_OAK might be a more appropriate name.

IS_MRST is primarily used for two things:
1) Take LVDS enable fuse value into account
2) Tell that LVDS must be on Pipe A

Those things where required for him to get the panel working,
so why not include the 0x4108 in the IS_MRST check?

-Patrik
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