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 daniel@ffwll.ch:

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