Display rotation in Wayland/weston in imx6sx

[Pekka Paalanen]

On Thu, 22 Jun 2017 06:50:11 +0000
Jomon John <jomon.john at tataelxsi.co.in> wrote:

> Teemu,
> 
> >>> There is rotate config(transform) option in Weston, but it did
> >>> nothing when tested. Is there a way to rotate the display in
> >>> Wayland that would work with iMX6 or is that something that is
> >>> not currently supported in that  combo? (Wayland + imx6).  

Hi,

how exactly did you try that? I think it should work, but if you e.g.
used a wrong output name in weston.ini, it will get ignored.

Do mention which backend and renderer you want to use.

> >>
> >>Transform will work, i tried the same on i.mx6 (with DRM backend)
> >>and it was working, but you will need mainline kernel. Not sure
> >>whether you can do the same fbdev backend.  

Are you sure of the kernel requirement? Weston should be using the
composition to rotate the image. Kernel support is only necessary if
one wants to hit the composite-bypass path if clients are not already
rotating as well.

I would expect it to work for all of fbdev/pixman, DRM/pixman and
DRM/GL.

> > At least quick glance to linux-fsl-imx - kernel menuconfig did show
> > DRM enabled, but that's pretty much it. No mention of NXP/Freescale
> > there. Only reason we are currently using Yocto 2.2 is that Yocto
> > 2.3 uses Weston 2.0 and at is it today the NXP does not provide
> > graphic drivers other than FBDev so I'm not sure how DRM would
> > work.   
> 
> The mainline got etnaviv, open source driver for vivante GPU also
> mesa got the necessary support for etnaviv. so you can use the mesa +
> etnaviv stack for DRI. 
> 
> > Is it accelerated?  
> 
> Not a graphics expert to make any comments, anyway it uses GPU :) .
> i am also trying out the DRI setup with wayland/weston. 

I've asked around recently about that myself, and it seems that while
Weston itself will be hardware accelerated ok, the support for Wayland
clients is not complete yet. Clients will run, but even with the latest
Mesa release, you will probably have tiling mismatch issues which cause
the window to appear garbled. I hear the work to fix that is going on
right now (support for pixel format modifiers).


Thanks,
pq
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