Hi Eric, On Fri, Sep 21, 2012 at 09:24:19AM -0700, Eric Nelson wrote: > Hi Sascha, > > While testing against a video-enabled U-Boot on i.MX6, I found the issue > below. >
[...] > > But ipu_crtc->imx_crtc gets initialized in this call, and > ipu_irq_handler() makes use of it. > > The U-Boot code doesn't enable interrupts, so it's not acking > along the way, and leaves bits set in IPU1_INT_STAT_15. > > I found that I can get around this in U-Boot by disabling the > LCD controller and acking all of the interrupts after disabling > the controller, but I haven't yet figured out where to tap into > cleanup_before_linux(). Passing over an enabled IPU from the bootloader to the kernel is (currently) not a supported usecase, so U-Boot should indeed disable it. That said, the kernel driver should make sure the IPU is sufficiently configured before the interrupts are enabled, so this seems to be a bug that deserves fixing. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel
