linux-imx

LF-509: video: fbdev: sii902x: Fix imx7d hdmi display not work

sii902x hdmi cable detect thread is trigged by
event FB_EVENT_FB_REGISTERED in register_framebuffer function
when device bootup.

when CONFIG_FB_MXC_OVERLAY is enabled, pixel clock has
chance to be disabled by overlay fb.
In this case cable detect thread will fail to get cable state
and sii902x hdmi will not initialized.

Fix it with immediate execute the cable detect thread and
add 20ms delay to wait cable detect thread get the cable state.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
Reviewed-by: Robby Cai <robby.cai@nxp.com>