Hi Gary, Am Mittwoch, den 27.05.2015, 15:31 +0200 schrieb Gary Bisson: > > According to the kerneldoc comment for drm_fb_helper_initial_config > > (which is used by imx-drm via drm_fbdev_cma_init), it should set up a > > single /dev/fb cloned over all connectors. This works here with LVDS and > > HDMI. > > Does it require the two displays to have the exact same resolution? > I'm wondering what is wrong with my setup but with a 1024x768 LVDS and > a 1920x1080 HDMI display no image is shown on the HDMI (no signal). > The CRTC settings show that both have the same origin (0,0) so I > expected the LVDS to display a part of what the HDMI *should* display. No, but it does require the HDMI and LVDS display to use different clock sources (unless LVDS serializer clock happens to be the same as the HDMI pixel clock). I wonder what we should do about this for devices that have both LVDS and HDMI output and can only use PLL5 for both. Register a clock notifier that vetoes changes? [...] > > For parallel and LVDS we'd either need to force the parallel panel to be > > clocked by the IPU internal clock, or move one or the other external > > clock source off of pll5_video. > > Do you have a preference for one solution over the other? That depends on the board. Is there an LVDS display that can be driven by a PLL other than PLL5? Since there is no sane way to change the LDB_DI parent in a running system, that should be configured in the device tree. regards Philipp _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
