[Bug 793339] kmssink: Renders at half my display refresh rate

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793339

Devarsh Thakkar <devarsht at xilinx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |devarsht at xilinx.com

--- Comment #1 from Devarsh Thakkar <devarsht at xilinx.com> ---
Created attachment 369527
  --> https://bugzilla.gnome.org/attachment.cgi?id=369527&action=edit
Skip VSYNC wait for synchronous SetPlane call

The new atomic DRM driver implements synchronous
DRM_IOCTL_MODE_SETPLANE ioctl which unlike
legacy DRM driver blocks until a VSYNC is done.

As a workaround we skip the explicit wait for VSYNC done
using drmWaitVBlank and drmModePageFlip whenever
drmModeSetPlane is used by an atomic DRM driver, until
kmssink starts supporting fully atomic DRM drivers.

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