linux-imx

LF-568-2: drm: gpu: bridge: cdns: Add force mode set flag

In DRM framework, when hdmi/dp cable plugout/plugin in the same HDMI
sink, because the video mode is same, DRM will not call mode_set.
But for HDMI 2.0 sink the SCDC configurate will lost, and DP sink
linktraning status will lost too after cable plugout then plugin.

Currently, hdmi/dp driver will call mode_set function in HPD thread,
But the mode_set function is called out of DRM framework, and it have
chance to fail.
In the patch add force_mode_set flag, set the crtc_state->mode_changed
to force drm call mode_set when cable plugin.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>