MIPI-DSI: LP-11 before atomic_pre_enable?

[Alexander Stein]

Hello,

after .IMX8M[MNP] support for samsung-dsim has been integrated into next, I'm 
trying add support for the MIPI-DSI-to-DP bridge (TC358767) on my TQMa8MPxL/
MBa8MPxL board (imx8mp-tqma8mpql-mba8mpxl.dts).
Both, DSI host and device, probe and attach successfully.
But once lcdif is probing and tries to get modes from display I run into 
timeouts on the aux channel. Specifically AUX_TIMEOUT is set in DP0_AUXSTATUS 
after the transfer has been issued.
I've been told that for aux channel to be actually usable the clock line (and 
D0?) has to be in LP-11. Register 0x218 (DSI_LANESTATUS1) of tc358867 is set 
to 0x1c which indicates that clock and data lane 0 are not in stop state, 
while data lanes 1 to 3 are.
Is there a way to explicitly set a DSI host into LP-11 state before the 
pipeline is enabled? Reading DPCD is used to get the modes needed for 
configuring the pipeline.

Best regards,
Alexander
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