On Mon, Jun 9, 2014 at 11:33 AM, Shawn Guo <shawn.guo@xxxxxxxxxxxxx> wrote: > 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 There were versions of linux-next that hdmi and lvds works at the same time without problems. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
