On 23 June 2014 20:37, Wang, Quanxian <quanxian.w...@intel.com> wrote: > > >> -----Original Message----- >> From: Jani Nikula [mailto:jani.nik...@linux.intel.com] >> Sent: Tuesday, June 17, 2014 11:38 PM >> To: Wang, Quanxian >> Cc: intel-gfx@lists.freedesktop.org; Daniel Vetter >> Subject: RE: [Intel-gfx] [PATCH] drm/i915/vlv: DP_SINK_COUNT is not reliable >> for valleyview platform. >> >> On Tue, 17 Jun 2014, "Wang, Quanxian" <quanxian.w...@intel.com> wrote: >> > File dmesg_normal_20140617.log will contain dmesg log when boot the >> > machine and start weston. (Previous is overwrite, but it is enough for >> graphics boot message) File dmesg_error_20140617.log contains dmesg log >> after Weston exit when it found no connector available. >> > >> > I disable log for hotplug event from valleyview_irq_handler. There are so >> many. Maybe you can find some private debug log. Don't need to care that. >> >> Per DP spec we need to read the SINK_COUNT. Perhaps your problem is the >> hotplug irqs? > [Wang, Quanxian] Hi, Jani > The log event is about the transaction event instead of hotplug event. It is > general since they will use I2c to read byte one by one. It will generate > many transaction. > > But the root cause is really about hotplug(intel_hpd_irq_handler). When we > switch to console, there will be a hotplug event happens after a while. After > that, the system will continually get the hotplug event to switch sink device > on and off periodly. With DisplayPort 1.2 spec, '' This bit is used for > either monitor hotplug/unplug or for notification of a sink event.", I am not > sure if it is notification of a sink event or real hotplug event. We have no > code to identify the difference between hotplug/unplug and notification of a > sink event. I check display port spec and also not found how to identify them > differently. > There are patches on the list to distinguish between short and long hpd irqs, they are need of review.
Dave. _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
