Linux 2.6 fbcon rotation - in software

Linux 2.6 fbcon rotation - in software

[Hasjim Williams]

Hi all,

I am looking to rotate the framebuffer console on an embedded ARM
device.  I know that both OPIE and GPE (X Windows) support screen
rotation in software.  I think they use a shadow framebuffer...  Has
anyone on either of the lists started implementing this in 2.6.x ???  I
know the Zaurus CL-3xxx series use the pxafb driver and fbcon is rotated
on these devices.  My platform uses the amba_clcd driver and fbcon is
also rotated on this device.

See http://sourceforge.net/mailarchive/message.php?msg_id=12904686 for
the Zaurus info.

Is there some easy / good way to add rotated console support to the
kernel?  Or do we have to use a shadow framebuffer?

Thanks for any help / suggestions ...


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Re: Linux 2.6 fbcon rotation - in software

[Antonino A. Daplas]

Hasjim Williams wrote:
> Hi all,
> 
> I am looking to rotate the framebuffer console on an embedded ARM
> device.  I know that both OPIE and GPE (X Windows) support screen
> rotation in software.  I think they use a shadow framebuffer...  Has
> anyone on either of the lists started implementing this in 2.6.x ???  I
> know the Zaurus CL-3xxx series use the pxafb driver and fbcon is rotated
> on these devices.  My platform uses the amba_clcd driver and fbcon is
> also rotated on this device.
> 
> See http://sourceforge.net/mailarchive/message.php?msg_id=12904686 for
> the Zaurus info.
> 
> Is there some easy / good way to add rotated console support to the
> kernel?  Or do we have to use a shadow framebuffer?

I had a patch that does software rotation for the framebuffer console. But
this was during 2.5. The patch does this by having different putcs, putc,
bmove, fill, and cursor methods depending on the orientation.

If this is really desired, I may try to revive that patch...

Tony 

PS: The i810fb driver for 2.4 (http://i810fb.sf.net) supports console
rotation in software.


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Re: Re: [Linux-fbdev-devel] Linux 2.6 fbcon rotation - in software

[Richard Purdie]

On Wed, 2005-10-26 at 19:45 +0800, Antonino A. Daplas wrote:
> Hasjim Williams wrote:
> > Hi all,
> > 
> > I am looking to rotate the framebuffer console on an embedded ARM
> > device.  I know that both OPIE and GPE (X Windows) support screen
> > rotation in software.  I think they use a shadow framebuffer...  Has
> > anyone on either of the lists started implementing this in 2.6.x ???  I
> > know the Zaurus CL-3xxx series use the pxafb driver and fbcon is rotated
> > on these devices.  My platform uses the amba_clcd driver and fbcon is
> > also rotated on this device.
> > 
> > See http://sourceforge.net/mailarchive/message.php?msg_id=12904686 for
> > the Zaurus info.
> > 
> > Is there some easy / good way to add rotated console support to the
> > kernel?  Or do we have to use a shadow framebuffer?
> 
> I had a patch that does software rotation for the framebuffer console. But
> this was during 2.5. The patch does this by having different putcs, putc,
> bmove, fill, and cursor methods depending on the orientation.
> 
> If this is really desired, I may try to revive that patch...

I was asked about this offlist and sent Hasjim a copy of the 2.5 patch. 

Console rotation would be extremely useful for several of the Zaurus
devices (Collie, Spitz, Akita and Borzoi). These use pxafb or sa1100fb
which don't support rotation in hardware. (The other Zaurus models use
w100fb which does support hardware rotation).

I've been planning to make the patch apply to recent kernels but haven't
found the time to do that yet...

Richard



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Re: [Openzaurus-devel] Re: Linux 2.6 fbcon rotation - in software

[Antonino A. Daplas]

Richard Purdie wrote:
> On Wed, 2005-10-26 at 19:45 +0800, Antonino A. Daplas wrote:
>> Hasjim Williams wrote:
>>> Hi all,
>>>
>>> I am looking to rotate the framebuffer console on an embedded ARM
>>> device.  I know that both OPIE and GPE (X Windows) support screen
>>> rotation in software.  I think they use a shadow framebuffer...  Has
>>> anyone on either of the lists started implementing this in 2.6.x ???  I
>>> know the Zaurus CL-3xxx series use the pxafb driver and fbcon is rotated
>>> on these devices.  My platform uses the amba_clcd driver and fbcon is
>>> also rotated on this device.
>>>
>>> See http://sourceforge.net/mailarchive/message.php?msg_id=12904686 for
>>> the Zaurus info.
>>>
>>> Is there some easy / good way to add rotated console support to the
>>> kernel?  Or do we have to use a shadow framebuffer?
>> I had a patch that does software rotation for the framebuffer console. But
>> this was during 2.5. The patch does this by having different putcs, putc,
>> bmove, fill, and cursor methods depending on the orientation.
>>
>> If this is really desired, I may try to revive that patch...
> 
> I was asked about this offlist and sent Hasjim a copy of the 2.5 patch. 
> 
> Console rotation would be extremely useful for several of the Zaurus
> devices (Collie, Spitz, Akita and Borzoi). These use pxafb or sa1100fb
> which don't support rotation in hardware. (The other Zaurus models use
> w100fb which does support hardware rotation).
> 

Ok, I have some spare time this weekend to update the patch.

Tony


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