Using kmssink with mxsfb-drm

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Hi,

I am trying to run a simple videotestsrc pipeline on a imx6ull-evk
board running kernel 5.10 and Gstreamer 1.18.2, but it fails as shown
below.

Any ideas?

Thanks,

Fabio Estevam

# modetest -M mxsfb-drm
Encoders:
id      crtc    type    possible crtcs  possible clones
34      33      none    0x00000001      0x00000000

Connectors:
id      encoder status          name            size (mm)       modes   encoders
31      34      connected       unknown-1       95x54           1       34
  modes:
        index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
  #0 480x272 59.94 480 482 523 525 272 274 284 286 9000 flags: nhsync,
nvsync; type: preferred, driver
  props:
        1 EDID:
                flags: immutable blob
                blobs:

                value:
        2 DPMS:
                flags: enum
                enums: On=0 Standby=1 Suspend=2 Off=3
                value: 0
        5 link-status:
                flags: enum
                enums: Good=0 Bad=1
                value: 0
        6 non-desktop:
                flags: immutable range
                values: 0 1
                value: 0
        4 TILE:
                flags: immutable blob
                blobs:

                value:

CRTCs:
id      fb      pos     size
33      35      (0,0)   (480x272)
  #0 480x272 59.94 480 482 523 525 272 274 284 286 9000 flags: nhsync,
nvsync; type: preferred, driver
  props:
        24 VRR_ENABLED:
                flags: range
                values: 0 1
                value: 0

Planes:
id      crtc    fb      CRTC x,y        x,y     gamma size      possible crtcs
32      33      35      0,0             0,0     0               0x00000001
  formats: XR24 RG16
  props:
        8 type:
                flags: immutable enum
                enums: Overlay=0 Primary=1 Cursor=2
                value: 1

Frame buffers:
id      size    pitch

# gst-launch-1.0 videotestsrc ! kmssink connector-id=31 name=mxsfb-drm
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstKMSSink:mxsfb-drm:
GStreamer encountered a general resource error.
Additional debug info:
../sys/kms/gstkmssink.c(1711): gst_kms_sink_show_frame ():
/GstPipeline:pipeline0/GstKMSSink:mxsfb-drm:
drmModeSetPlane failed: Invalid argument (22)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
ERROR: from element
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data
stream error.
Additional debug info:
../libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming stopped, reason error (-5)
ERROR: pipeline doesn't want to preroll.
Freeing pipeline ...



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