create framebuffer device layer overlay

[Alex Vazquez]

Hi, Daniel!
I used my application also Pc and  I would like to be as compatible as
possible.
How could create the device framebuffer from overlay layer using libdrm?

Thanks!

2015-09-04 14:52 GMT+02:00 Daniel Vetter :

> On Fri, Sep 04, 2015 at 11:59:58AM +0200, Alex Vazquez wrote:
> > Hi,all!
> >
> > I'm using atmel-hlcdc driver to control a LCD panel and an application
> uses
> > the /dev/fb0 framebuffer created by the driver. The display works fine
> > except that the panel's standard orientation is landscape mode (480x275)
> > and I need to use it in portrait mode (275x480).
> >
> > I know that the driver allow rotation but is only for the overlays
> layers,
> > and not the baselayer.
> >
> > I have tested with modetest and i can do what i want.
> >
> > I want to know if is posible create a device framebuffer from overlay
> layer
> > use libdrm (e.g. /dev/fb1).
>
> Legacy fbdev support really is only for debugging and stuff like that, if
> you have a kms driver I highly recommend that you just use the dumb buffer
> api and assign them to overlays like modetest. Ofc it would be technically
> possible to create more legacy framebuffer devices, but I don't think
> that's something which would be received with enthusiasm by upstream.
> -Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
>
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create framebuffer device layer overlay

[Daniel Vetter]

On Fri, Sep 04, 2015 at 11:59:58AM +0200, Alex Vazquez wrote:
> Hi,all!
> 
> I'm using atmel-hlcdc driver to control a LCD panel and an application uses
> the /dev/fb0 framebuffer created by the driver. The display works fine
> except that the panel's standard orientation is landscape mode (480x275)
> and I need to use it in portrait mode (275x480).
> 
> I know that the driver allow rotation but is only for the overlays layers,
> and not the baselayer.
> 
> I have tested with modetest and i can do what i want.
> 
> I want to know if is posible create a device framebuffer from overlay layer
> use libdrm (e.g. /dev/fb1).

Legacy fbdev support really is only for debugging and stuff like that, if
you have a kms driver I highly recommend that you just use the dumb buffer
api and assign them to overlays like modetest. Ofc it would be technically
possible to create more legacy framebuffer devices, but I don't think
that's something which would be received with enthusiasm by upstream.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

create framebuffer device layer overlay

[Alex Vazquez]

Hi,all!

I'm using atmel-hlcdc driver to control a LCD panel and an application uses
the /dev/fb0 framebuffer created by the driver. The display works fine
except that the panel's standard orientation is landscape mode (480x275)
and I need to use it in portrait mode (275x480).

I know that the driver allow rotation but is only for the overlays layers,
and not the baselayer.

I have tested with modetest and i can do what i want.

I want to know if is posible create a device framebuffer from overlay layer
use libdrm (e.g. /dev/fb1).

Thanks!
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