[Freedreno] xinerma - xrandr apq8064 drm fbdev

[Vinay Simha B N]

rob,

i tried using dsi_mgr_parse_dual_dsi , but dsi1 is not getting enabled for
some reason, may be TODO:apq8064 more when we use dual dsi in dts.

so i am trying without using dsi_mgr_parse_dual_dsi/dual dsi in dts

after modifying dsi_manager.c , now userspace is assuming as single display
for two encoders

dsi_mgr_connector_get_modes
 if (IS_DUAL_DSI() || id == DSI_1 )
dsi_dual_connector_tile_init

thanks.



On Wed, Jun 14, 2017 at 7:21 PM, Rob Clark <robdclark at gmail.com> wrote:

> On Wed, Jun 14, 2017 at 7:25 AM, Vinay Simha B N <simhavcs at gmail.com>
> wrote:
> > hi,
> >
> > i am having two encoders dsi1 and dsi2 of same resolution, i want to
> > configure as single resolution 960x864,
> >
> > after configuring as right-of , i got 960x864 resolution, but not able to
> > use as single fb as of xinerma
> > xrandr --output DSI-1 --mode 480x864 --right-of DSI-2
> >
> > root at linaro-alip:~# xrandr
> > Screen 0: minimum 320 x 200, current 960 x 864, maximum 2048 x 2048
> > DSI-1 connected 480x864+480+0 (normal left inverted right x axis y axis)
> 0mm
> > x 0mm
> >    480x864       60.00*
> > DSI-2 connected 480x864+0+0 (normal left inverted right x axis y axis)
> 0mm x
> > 0mm
> >    480x864       60.00*
> >
> > any suggestions on how to configure it as xinerma? if not possible i
> guess
> > need to modify the drm fbdev and divide the buffer(h/2) to left and right
> > encoders.
>
>
> You probably don't want to use xinerama, but normal xrandr commands should
> work.
>
> But you probably want to have the kernel put TILE mode properties on
> the connector (similar to DP MST display) so userspace realizes this
> is logically a single display and sets things up automatically.  See
> drm_mode_create_tile_group().  The code should already be in place to
> call this but maybe you are missing the dt property?  See
> dsi_mgr_parse_dual_dsi().
>
> xf86-video-freedreno might not handle the TILE properties properly,
> but xf86-video-modesetting should (and is the ddx driver that everyone
> should be using unless you have a very old xserver)
>
> BR,
> -R
>



-- 
regards,
vinaysimha
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