Hi Devs! On Thu, Jun 8, 2017 at 4:08 AM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote: > I don't think that using cma for the gm12u320 is a good idea, it will > typically be used as a secondary GPU output together with a real GPU > extending the desktop by being a prime display output. So for the memory > management stuff I would keep the code copied from the udl driver (which > we may later split out in a separate helper lib for devices where > the framebuffer is in normal system memory and we have some scather-gather > capable process copying it to the real device over e.g. USB) > I got the PL111 driver and stripped all device specific code. Also, I added the get_modes and driver usb probe functions from gm12u320. The resulting code is available in https://gitlab.com/marcodiego/dummy-display-driver . The driver compiles, loads, identifies the device when I plug it, /dev/fb1 is created adequately but it stops there. Gnome monitors tool does not see it as a new monitor. What I expected was that it would be seen as a new monitor and that I could even activate it. Instead, syslog complains: "Cannot find any crtc or sizes". Anyway, I think this is a first step. My first doubt: where should I go from now? What should I change in the driver so that gnome monitors tool sees it as a new monitor and I could activate it, even if it works as a mere dummy device? Second doubt is: is this really the simplest/best way? I mean, the repaper driver that Emil pointed seems a lot simpler, wouldn't it be better to mimic it? How complicated is it to modify the repaper driver to build a dummy driver? By dummy driver, I mean something that gnome monitors tools can identify as a new monitor and I can activate it. I hope to reach a point where the update or dirty callback is called. From that point on it is just a matter of sending the framebuffer through USB the way gm12u320 does currently. Thanks! _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
