Re: [PATCH 13/15] drm/amdgpu/display: split dp connector registration (v3)

[Daniel Vetter <daniel@ffwll.ch>]

On Fri, Feb 14, 2020 at 12:39:22PM -0500, Alex Deucher wrote:
> On Fri, Feb 14, 2020 at 2:39 AM Daniel Vetter <daniel@ffwll.ch> wrote:
> >
> > On Fri, Feb 07, 2020 at 04:17:13PM -0500, Alex Deucher wrote:
> > > Split into init and register functions to avoid a segfault
> > > in some configs when the load/unload callbacks are removed.
> > >
> > > v2:
> > > - add back accidently dropped has_aux setting
> > > - set dev in late_register
> > >
> > > v3:
> > > - fix dp cec ordering
> >
> > Why did you move this back out of the late_register callback when going
> > from v2->v3? In i915 we register the cec stuff from ->late_register, like
> 
> I got a bunch of complaints from the cec code when I had it switched
> the other way.  They went away when I moved it back.  I don't remember
> the exact messages off hand.

Would be interesting to learn want went wrong, just in case there's a core
bug here somewhere that prevents drivers from tdtr. But definitely no
reason to hold off this patch.
-Daniel

> 
> Alex
> 
> > anything else userspace visible. Maybe follow-up patch (the idea behind
> > removing the ->load callback is to close all the driver load races,
> > instead of only open("/dev/dri/0"), which is protected by
> > drm_global_mutex). On this:
> >
> > Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> >
> > Cheers, Daniel
> >
> > >
> > > Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> > > ---
> > >  drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c   | 16 ++++++++++++++++
> > >  drivers/gpu/drm/amd/amdgpu/atombios_dp.c         | 10 ++--------
> > >  .../amd/display/amdgpu_dm/amdgpu_dm_mst_types.c  |  7 ++++++-
> > >  3 files changed, 24 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
> > > index ec1501e3a63a..f355d9a752d2 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
> > > @@ -1461,6 +1461,20 @@ static enum drm_mode_status amdgpu_connector_dp_mode_valid(struct drm_connector
> > >       return MODE_OK;
> > >  }
> > >
> > > +static int
> > > +amdgpu_connector_late_register(struct drm_connector *connector)
> > > +{
> > > +     struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
> > > +     int r = 0;
> > > +
> > > +     if (amdgpu_connector->ddc_bus->has_aux) {
> > > +             amdgpu_connector->ddc_bus->aux.dev = amdgpu_connector->base.kdev;
> > > +             r = drm_dp_aux_register(&amdgpu_connector->ddc_bus->aux);
> > > +     }
> > > +
> > > +     return r;
> > > +}
> > > +
> > >  static const struct drm_connector_helper_funcs amdgpu_connector_dp_helper_funcs = {
> > >       .get_modes = amdgpu_connector_dp_get_modes,
> > >       .mode_valid = amdgpu_connector_dp_mode_valid,
> > > @@ -1475,6 +1489,7 @@ static const struct drm_connector_funcs amdgpu_connector_dp_funcs = {
> > >       .early_unregister = amdgpu_connector_unregister,
> > >       .destroy = amdgpu_connector_destroy,
> > >       .force = amdgpu_connector_dvi_force,
> > > +     .late_register = amdgpu_connector_late_register,
> > >  };
> > >
> > >  static const struct drm_connector_funcs amdgpu_connector_edp_funcs = {
> > > @@ -1485,6 +1500,7 @@ static const struct drm_connector_funcs amdgpu_connector_edp_funcs = {
> > >       .early_unregister = amdgpu_connector_unregister,
> > >       .destroy = amdgpu_connector_destroy,
> > >       .force = amdgpu_connector_dvi_force,
> > > +     .late_register = amdgpu_connector_late_register,
> > >  };
> > >
> > >  void
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
> > > index ea702a64f807..9b74cfdba7b8 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
> > > @@ -186,16 +186,10 @@ amdgpu_atombios_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *m
> > >
> > >  void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector)
> > >  {
> > > -     int ret;
> > > -
> > >       amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd;
> > > -     amdgpu_connector->ddc_bus->aux.dev = amdgpu_connector->base.kdev;
> > >       amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer;
> > > -     ret = drm_dp_aux_register(&amdgpu_connector->ddc_bus->aux);
> > > -     if (!ret)
> > > -             amdgpu_connector->ddc_bus->has_aux = true;
> > > -
> > > -     WARN(ret, "drm_dp_aux_register_i2c_bus() failed with error %d\n", ret);
> > > +     drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux);
> > > +     amdgpu_connector->ddc_bus->has_aux = true;
> > >  }
> > >
> > >  /***** general DP utility functions *****/
> > > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > > index 3959c942c88b..d5b9e72f2649 100644
> > > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > > @@ -155,6 +155,11 @@ amdgpu_dm_mst_connector_late_register(struct drm_connector *connector)
> > >       struct amdgpu_dm_connector *amdgpu_dm_connector =
> > >               to_amdgpu_dm_connector(connector);
> > >       struct drm_dp_mst_port *port = amdgpu_dm_connector->port;
> > > +     int r;
> > > +
> > > +     r = drm_dp_aux_register(&amdgpu_dm_connector->dm_dp_aux.aux);
> > > +     if (r)
> > > +             return r;
> > >
> > >  #if defined(CONFIG_DEBUG_FS)
> > >       connector_debugfs_init(amdgpu_dm_connector);
> > > @@ -484,7 +489,7 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> > >       aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
> > >       aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;
> > >
> > > -     drm_dp_aux_register(&aconnector->dm_dp_aux.aux);
> > > +     drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
> > >       drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
> > >                                     &aconnector->base);
> > >
> > > --
> > > 2.24.1
> > >
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> >
> > --
> > Daniel Vetter
> > Software Engineer, Intel Corporation
> > http://blog.ffwll.ch

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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