Hi Sascha, On Mon, Jan 11, 2016 at 5:16 AM, Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> wrote: > Unfortunately this LCD controller does not have an enable bit. The > controller starts directly when the clocks are enabled. If the clocks > are enabled when the controller is not yet programmed with proper > register values then it just goes into some undefined state. What I > suspect is that the clocks already were enabled before driver probe, > presumably by the bootloader, so the controller is already in undefined > state when entering Linux. Now by dis/enabling the ipg clock you > effectively reset the controller. Since you have programmed it with > valid register values in the mean time it starts working after this > reset. > To verify you could try to disable the LCDC related clock gates with > direct register writes in drivers/clk/imx/clk-imx25.c. Excellent! I did as you suggested and now the LCD turns on by default. U-boot was enabling the LCD IPG clock. Will submit a formal patch soon. Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
