update from s-media regarding landscape flicker

Andy Green andy at openmoko.com
Tue Mar 25 14:55:01 CET 2008


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Somebody in the thread at some point said:
> Am Di  25. März 2008 schrieb Werner Almesberger:
>> Andy Green wrote:
>>> Yes, I guess the problem for this chip comes from the fact it still
>>> issues a portrait raster to the LCM, so it has to compose each portrait
>>> line from pixels that are totally disjoint in memory.
>> Just a thought: if the LCM could be configured to run in landscape
>> mode, 
> 
> I understand we are already doing this

No the LCM only understands video timing that is 480 pixels inside a
HSYNC line and 640 lines per VSYNC, plus blanking.

That's why rotating it in the Glamo is so attractive, the CPU can treat
it as easy 640 x 480 in memory (where the pixels in the 640 are all next
to each other in memory), the Glamo acceleration can operate on it as
640 x 480, and the LCM can continue to treat it as 480 x 640 portrait,
everybody would have been happy.

- -Andy
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