The Linux DRM Drivers Continue Marching Ahead With Atomic Support

[phoronix]

Phoronix: The Linux DRM Drivers Continue Marching Ahead With Atomic Support

The Linux kernel DRM/KMS drivers continue moving ahead with their atomic conversion...

http://www.phoronix.com/scan.php?page=news_item&px=Atomic-DRM-2016-Update

[luigide]

test_atomic.c

#include <stdio.h>
#include <fcntl.h>
#include <libdrm/drm.h>

int main()
{
    unsigned int fd, num[40], objs[40], props[40], val[40];

    struct drm_mode_get_plane_res  pres = {0};
    struct drm_mode_get_plane plane     = {0};
    struct drm_set_client_cap cap;
    struct drm_mode_atomic atom         = {0};

    fd  = open("/dev/dri/card0", O_RDWR | O_CLOEXEC | O_NONBLOCK);

    cap.capability = DRM_CLIENT_CAP_UNIVERSAL_PLANES;
    cap.value      = 1;
    ioctl(fd, DRM_IOCTL_SET_CLIENT_CAP, &cap);

    cap.capability = DRM_CLIENT_CAP_ATOMIC;
    cap.value      = 1;
    ioctl(fd, DRM_IOCTL_SET_CLIENT_CAP, &cap);
    perror("DRM_IOCTL_SET_CLIENT_CAP");

    atom.flags    = DRM_MODE_ATOMIC_ALLOW_MODESET;
    atom.objs_ptr        = (long) objs;
    atom.count_props_ptr = num;
    atom.props_ptr       = props;
    atom.prop_values_ptr = val;
    ioctl(fd, DRM_IOCTL_MODE_ATOMIC, &atom);
    perror("DRM_IOCTL_MODE_ATOMIC");
    printf("count_objs :%d\n", atom.count_objs);

    close(fd);
    return 0;
}

me@pc ./test_atomic
DRM_IOCTL_SET_CLIENT_CAP: success
DRM_IOCTL_MODE_ATOMIC: success
count_obj :0
me@pc

hi. According to above test i have NOT any atomic object. WHY?

CARD: intel ivybridge mobil linux: 4.5.4