On Wed, 29 Mar 2017 15:26:45 +0200 Daniel Vetter <daniel@xxxxxxxx> wrote: > On Wed, Mar 29, 2017 at 12:16:50PM +0200, Maarten Lankhorst wrote: > > mode_valid() and get_modes() called > > from drm_helper_probe_single_connector_modes() > > may need to look at connector->state because what a valid mode is may > > depend on connector properties being set. For example some HDMI modes > > might be rejected when a connector property forces the connector > > into DVI mode. > > > > Some implementations of detect() already lock all state, > > so we have to pass an acquire_ctx to them to prevent a deadlock. > > > > This means changing the function signature of detect() slightly, > > and passing the acquire_ctx for locking multiple crtc's. > > It might be NULL, in which case expensive operations should be avoided. > > > > intel_dp.c however ignores the force flag, so still lock > > connection_mutex there if needed. > > > > Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > > Cc: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> > > Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx> > > Hm only noticed this now, but mixing up force with the acquire_ctx sounds > like very bad interface design. Yes, the only user of the new hook works > like that, but that's really accidental I think. I think just having the > ctx everywhere (for atomic drivers at least) would be a lot safer. This is > extremely surprising (and undocumented suprise at that). Yes, I was about to say the same thing: the interface is not very clear, and I don't understand why ctx = NULL implies force = false. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
