On Tue, Sep 29, 2015 at 06:25:44PM +0200, Daniel Vetter wrote: > On Tue, Sep 29, 2015 at 05:27:33PM +0200, Lukas Wunner wrote: > > Hi Daniel, > > > > On Tue, Sep 29, 2015 at 05:04:03PM +0200, Daniel Vetter wrote: > > > On Tue, Sep 29, 2015 at 02:49:20PM +0200, Lukas Wunner wrote: > > > > On Mon, Sep 28, 2015 at 04:45:35PM -0700, Rafael Antognolli wrote: > > > > > This is useful to determine which connector owns this AUX channel. > > > > > > > > WTF? I posted a patch in August which does exactly that: > > > > http://lists.freedesktop.org/archives/dri-devel/2015-August/088172.html > > > > > > > > Can also be pulled in from this git repo: > > > > https://github.com/l1k/linux/commit/b78b38d53fc0fc4fa0f6acf699b0fcad56ec1fe6 > > > > > > > > My patch has the advantage that it updates all the drivers which use > > > > drm_dp_aux to fill that attribute. Yours only updates i915. > > > > > > > > Daniel Vetter criticized storing a drm_connector pointer in drm_dp_aux, > > > > quote: > > > > > > > > "That will also clear up the confusion with drm_dp_aux, adding a > > > > drm_connector there feels wrong since not every dp_aux line has a > > > > connector (e.g. for dp mst). If we can lift this relation out into drivers > > > > (where this is known) that seems cleaner." > > > > > > > > So now Intel itself does precisely what Daniel criticized? Confusing! > > > > > > > > Source: > > > > http://lists.freedesktop.org/archives/dri-devel/2015-August/089108.html > > > > > > Critism is still valid, and thinking about this again a cleaner solution > > > would be to just have a correct parent/child relationship in the device > > > hirarchy. I.e. add a struct device *parent to the aux channel structure > > > which should point to the right connector. > > > > We already have that: > > > > struct drm_dp_aux { > > const char *name; > > struct i2c_adapter ddc; > > struct device *dev; <----------- > > struct mutex hw_mutex; > > ssize_t (*transfer)(struct drm_dp_aux *aux, > > struct drm_dp_aux_msg *msg); > > unsigned i2c_nack_count, i2c_defer_count; > > }; > > > > What Rafael is struggling with is that you cannot unambiguously > > get from drm_dp_aux->dev to the drm_connector. (The drm_device > > may have multiple drm_connectors with type > > DRM_MODE_CONNECTOR_DisplayPort.) > > What I meant to say is that we don't need that, if instead of filling in > the overall dev in dp_aux->dev we fill in the connector sysfs device > thing. The we have proper nesting, like with i2c buses. And then there's > no need for a connector property in sysfs to show that link (which should > be done with a proper sysfs link anyway). OK, I sent a new version, which does not add a new *connector pointer, and uses the dev pointer on the struct to store the drm_connector device, instead of the drm_device device. Is that what you meant? In any case, as I mention on the patch, it is already how some drivers do, while others store the drm_device. This leaves the aux device, for instance in my case, at: /sys/class/drm/card0/card0-eDP-1/drm_dp_aux0 If this is what you wanted, I can send other patches to the proper mailing lists, trying to update other drivers. -- Rafael > > > > > > > > Thanks for pointing out that I missed properly delayering this. > > > -Daniel > > > > > > > > > > > > > > > Best regards, > > > > > > > > Lukas > > > > > > > > > > > > > > > > > > Signed-off-by: Rafael Antognolli <rafael.antognolli@xxxxxxxxx> > > > > > --- > > > > > drivers/gpu/drm/i915/intel_dp.c | 1 + > > > > > include/drm/drm_dp_helper.h | 1 + > > > > > 2 files changed, 2 insertions(+) > > > > > > > > > > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c > > > > > index 77f7330..f90439d 100644 > > > > > --- a/drivers/gpu/drm/i915/intel_dp.c > > > > > +++ b/drivers/gpu/drm/i915/intel_dp.c > > > > > @@ -1079,6 +1079,7 @@ intel_dp_aux_init(struct intel_dp *intel_dp, struct intel_connector *connector) > > > > > > > > > > intel_dp->aux.name = name; > > > > > intel_dp->aux.dev = dev->dev; > > > > > + intel_dp->aux.connector = connector->base.kdev; > > > > > intel_dp->aux.transfer = intel_dp_aux_transfer; > > > > > > > > > > DRM_DEBUG_KMS("registering %s bus for %s\n", name, > > > > > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h > > > > > index 9ec4716..e009b5d 100644 > > > > > --- a/include/drm/drm_dp_helper.h > > > > > +++ b/include/drm/drm_dp_helper.h > > > > > @@ -702,6 +702,7 @@ struct drm_dp_aux { > > > > > const char *name; > > > > > struct i2c_adapter ddc; > > > > > struct device *dev; > > > > > + struct device *connector; > > > > > struct mutex hw_mutex; > > > > > ssize_t (*transfer)(struct drm_dp_aux *aux, > > > > > struct drm_dp_aux_msg *msg); > > > > > -- > > > > > 2.4.3 > > > > > > > > > > _______________________________________________ > > > > > dri-devel mailing list > > > > > dri-devel@xxxxxxxxxxxxxxxxxxxxx > > > > > http://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 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
