I was also going to say that I believe this breaks DP hotplug, but this was
agreed already...

But I also don't understand how hot_plug is called twice since it calls
encoder->hot_plug...
and dp has no ->hot_plug...
And also if this is happening how this code that checks for connector would
help... there is something else strange happening...



On Sat, Sep 5, 2015 at 9:31 PM Jindal, Sonika <sonika.jindal@intel.com>
wrote:

>
>
> On 9/4/2015 8:17 PM, Daniel Vetter wrote:
> > On Fri, Sep 04, 2015 at 06:56:15PM +0530, Sonika Jindal wrote:
> >> If the same port is enumerated as hdmi as well as DP, this will get
> >> called for DP connector as well which is not required because
> >> i915_hotplug_work_func is solely to handle hdmi HPD.
> >>
> >> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> >> ---
> >>   drivers/gpu/drm/i915/intel_hotplug.c |    3 ++-
> >>   1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_hotplug.c
> b/drivers/gpu/drm/i915/intel_hotplug.c
> >> index 53c0173..8e1c43e 100644
> >> --- a/drivers/gpu/drm/i915/intel_hotplug.c
> >> +++ b/drivers/gpu/drm/i915/intel_hotplug.c
> >> @@ -325,7 +325,8 @@ static void i915_hotplug_work_func(struct
> work_struct *work)
> >>
> >>      list_for_each_entry(connector, &mode_config->connector_list, head)
> {
> >>              intel_connector = to_intel_connector(connector);
> >> -            if (!intel_connector->encoder)
> >> +            if (!intel_connector->encoder
> >> +                    && connector->connector_type !=
> DRM_MODE_CONNECTOR_HDMIA)
> >>                      continue;
> >
> > Pretty sure this breaks hotplug detection for everything but HDMI (since
> > now nothing but hdmi gets called it's ->detect function, and only if that
> > signals a status change will we send out an uevent to userspace). Does
> > this really not break DP hotplug?
> >
> > Yes we probe both hdmi and DP always, and probably we could be more
> > intelligent with the fallback between the too. But this here doesn't seem
> > to be the right solution.
> > -Daniel
>
> Hmm :(
> This doesn't allow detect to be called for dp. I missed the part that
> hpd_pulse only handles mst. From the name and comments it looks like it
> should handle hpd for dp completely. I think this this code needs some
> refactoring.
>
> For now, I think I better move this check to intel_encoder->hot_plug
> function because for the connectors with dp and hdmi both, this hot_plug
> hook gets called twice.
>
> >
> >>              intel_encoder = intel_connector->encoder;
> >>              if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
> >> --
> >> 1.7.10.4
> >>
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> >
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