On Tue, 2019-08-06 at 15:51 +0200, Daniel Vetter wrote: > On Tue, Aug 06, 2019 at 03:55:48PM +0300, Stanislav Lisovskiy wrote: > > This series introduce to drm a way to determine if something else > > except connection_status had changed during probing, which > > can be used by other drivers as well. Another i915 specific part > > uses this approach to determine if edid had changed without > > changing the connection status and send a hotplug event. > > Did you read through the entire huge thread on all this (with I think > Paul, Pekka, Ram and some others)? I feel like this is mostly taking > that > idea, but not taking a lot of the details we've discussed there. > Specifically I'm not sure how userspace should handle this without > also > exposing the epoch counter, or at least generating a hotplug event > for the > specific connector. All that and more we discussed there. > > And then there's the follow-up question: What's the userspace for > this? > Existing expectations are a minefield here, so even if you don't plan > to > change userspace we need to know what this is aimed for, and see > above I > don't think this is possible to use without userspace changes ... Yes, sure I agree about userspace. However I guess we must start from something at least. I think I have seen some discussion regarding exposing this epoch counter as a property. Was even implementing this at some point but didn't dare to send to mailing list :) My idea was just to expose this epoch counter as a drm property, to let userspace then to figure out, what has happened, as imho adding different events for this and that is a bit of an overkill and brings additional complexity.. However, please let me know, what do you think we should do for userspace. -Stanislav > -Daniel > > > > > Stanislav Lisovskiy (3): > > drm: Add helper to compare edids. > > drm: Introduce change counter to drm_connector > > drm/i915: Send hotplug event if edid had changed. > > > > drivers/gpu/drm/drm_connector.c | 1 + > > drivers/gpu/drm/drm_edid.c | 33 > > ++++++++++++++++++++ > > drivers/gpu/drm/drm_probe_helper.c | 29 +++++++++++++++- > > - > > drivers/gpu/drm/i915/display/intel_dp.c | 16 +++++++++- > > drivers/gpu/drm/i915/display/intel_hdmi.c | 16 ++++++++-- > > drivers/gpu/drm/i915/display/intel_hotplug.c | 21 ++++++++++--- > > include/drm/drm_connector.h | 3 ++ > > include/drm/drm_edid.h | 9 ++++++ > > 8 files changed, 117 insertions(+), 11 deletions(-) > > > > -- > > 2.17.1 > > > > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
