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@xxxxxxxxxxxxxx> w dniu 30.03.2022, o godz. 12:20:
Does it change anything if you do a "modetest -s 69@67:1920x1080" before
starting the app? Or if you run "modetest -P 43@67:1920x1080@NV12"
before starting the app? Or other combinations thereof?
So i tried following combinations
-boot
-modetest -s 69@67:1920x1080 -> ok
-modetest -P 43@67:1920x1080@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@67:1920x1080 -> ok
step 2: modetest -P 43@67:1920x1080@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.
static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
{
/* ROOT_ONLY is only for CAP_SYS_ADMIN */
if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) {
printk("DRM_ROOT_ONLY\n");
return -EACCES;
}
/* AUTH is only for authenticated or render client */
if (unlikely((flags & DRM_AUTH) &&
!drm_is_render_client(file_priv) &&
!file_priv->authenticated)) {
printk("DRM_AUTH\n");
return -EACCES;
}
/* MASTER is only for master or control clients */
if (unlikely((flags & DRM_MASTER) &&
!drm_is_current_master(file_priv))) {
printk("DRM_MASTER\n");
return -EACCES;
}
/* Render clients must be explicitly allowed */
if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
drm_is_render_client(file_priv))) {
printk("DRM_RENDER_NOT_ALLOW\n");
return -EACCES;
}
return 0;
}
After bypass the permission check, I can run step 2 , but the display on
the screen will have a shift as the wrong dly configuration.
So how you two got step two run success?
Piotr:
What soc is on you board? rk3566 or rk3568?
I have a scripts[0] use io[1] command to dump the VOP2 register you can
use it dump the register configuration when you meet a display failure,
then send the dump to me, maybe I can figure out something.
[0]https://github.com/andyshrk/buildroot/blob/2022/board/andyshrk/rootfs_overlay/usr/bin/vop2_dump.sh
[1] https://github.com/andyshrk/io
Sascha
