omapdss DSI error: cannot lock PLL during omapfb probe

Hi,

I have a problem with dss in my kernel and custom board - similar to omap3evm. Sometimes I have problem with such errors:

omapdss DSI error: cannot lock PLL - during sturtup and whole lcd initialization fails (it is during omapfb_probe)

I used kernel with CONFIG_OMAP2_DSS_USE_DSI_PLL so DSI clk is used for pixel clock.

Now I'm testing kernel without CONFIG_OMAP2_DSS_USE_DSI_PLL, pixel clk = 12.5 MHz.

Is there any restriction to omit this config for DSS ? It seems to solve my problem with kernel crushes.