[PATCH v9 00/23] drm/rockchip: RK356x VOP2 support

[Sascha Hauer]

On Thu, Mar 31, 2022 at 08:13:09PM +0800, Andy Yan wrote:
> Hi Piotr:
> 
> On 3/31/22 03:20, Sascha Hauer wrote:
> > On Wed, Mar 30, 2022 at 04:52:22PM +0200, Piotr Oniszczuk wrote:
> > > 
> > > > Wiadomość napisana przez Sascha Hauer <s.hauer at pengutronix.de> w dniu 30.03.2022, o godz. 12:20:
> > > > 
> > > > Does it change anything if you do a "modetest -s 69 at 67:1920x1080" before
> > > > starting the app? Or if you run "modetest -P 43 at 67:1920x1080 at NV12"
> > > > before starting the app? Or other combinations thereof?
> > > So i tried following combinations
> > > 
> > > -boot
> > > -modetest -s 69 at 67:1920x1080 -> ok
> > > -modetest -P 43 at 67:1920x1080 at NV12 -> green screen
> > I have no idea what is going on here. There same commands work for me.
> > You could provide me your kernel config and upstream commitish you are
> > working on, maybe that gets me closer to your setup.
> 
> 
> It's a little strange, I can't reproduce this issue neither.
> 
> But I have problem with this two step command sequence.
> 
> step 1:  modetest -s 69 at 67:1920x1080 -> ok
> 
> step 2:  modetest -P 43 at 67:1920x1080 at NV12,
> 
> I got the failed message:  "failed to enable plane: Permission denied"
> 
> Because the drm core will stop step2 by drm_ioctrl_permit as
> DRM_IOCTL_SETPLANE need a master,
> 
> but the current master is the modetest run by step1.
>

[...]

> 
> So how you two got step two run success?

You have to stop the first modetest by hitting return. Alternatively you
could pass the -d option to the first modetest.

Sascha

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