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If hdmi plug in when kernel starting, hdmi may be without output. Because the old criteria that to determine whether uboot logo is on is hdmi phy pll locked and hdmi is connected. But in some platform(such as rk3229), hdmi phy pll is locked even hdmi phy is power down. In this case, the old criteria is unreliable. So we add a new criteria that check Frame Composer register.If the register value is not 0, we think that uboot logo is on, hdmi has been setup. Change-Id: Ifaa27030e5f5d551bec8f971694ff5d9c34a7c1d Signed-off-by: Algea Cao <algea.cao@rock-chips.com>