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Linux/DS90UB941AS-Q1: How config 941&948 with HV mode

Part Number: DS90UB941AS-Q1

Tool/software: Linux

Hello,

We are using 941 and 948 to transmit vedio to panel, and the panel is HV sync mode.My mipi output is vedio mode,RGB888,the display timing is config as the panel spec.

But nothing show on the screen.I have another panel which used DE mode, and I can drive this panel display the right things. So I think I should config 941&948 to

work on HV mode. I try to config the FRC_CONTROL 0x29【bit7】 = 1 , but panel still show nothing. How should I config the 941&948? Thanks!