On Mon, Jun 09, 2014 at 11:29:28AM -0300, Fabio Estevam wrote: > On Mon, Jun 9, 2014 at 11:06 AM, Russell King - ARM Linux > <linux@xxxxxxxxxxxxxxxx> wrote: > > > Please check the status in /sys/class/drm/card0-HDMI-A-1/status. This > > should report the current state of the hotplug detection. > > /sys/class/drm/card0-HDMI-A-1/status returns the correct state for > HDMI cable connection. > > > Remember that this code detects off the HPD signal - if the HPD signal > > has not been correctly wired up, this patch is not going to help (really > > it comes down to a hardware fault, which I'm not trying to solve with > > this patch.) > > > > What I'm trying to resolve with this patch is that the state detected > > on properly wired up systems corresponds with the real initial state of > > the interface at initialisation time. > > > > The problem with the current code is that we start off assuming that the > > interface is disconnected, and we rely on an interrupt arriving to change > > that state. If for whatever reason that interrupt does not arrive, then, > > even if the HPD signal is active, we continue believing that the interface > > is not connected. > > > > I seem to remember discussion in the past that the HPD signal is not > > wired up on SabreSD. Really, this needs to be a DT flag to indicate > > It is sabrelite board that does not have HPD signal not wired up. > > sabresd does have HPD signal connected. > > The HDMI undetected issue I am seeing on sabresd seems to be related > to the simultaneous usage of HDMI and LVDS. > > If I remove the ldb node from the imx6qdl-sabresd.dtsi, then the HDMI > cable is correctly detected and HDMI is shown right after boot. This is a known limitation. http://thread.gmane.org/gmane.linux.ports.arm.kernel/315968/focus=318559 Shawn _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
