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. _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
