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ds949 hdmi时钟

mcu->949->948->lcm

HDMI接口接别的屏幕会正常显示,然后将次hdmi信号切换输入到949,此时lcm也正常显示,949检测到的hdmi频率为0x98,如果不先接别的屏幕。949检测到的hdmi时钟就是0x4c,只有一半,此时不会显示,这可能是什么原因啊,该怎么排查问题