[Intel-gfx] [PATCH v2] drm: Fire off KMS hotplug events if probe detect says the connector is connected

[Mun, Gwan-gyeong]

On Thu, Apr 18, 2019 at 7:33 PM Jani Nikula <jani.nikula at linux.intel.com> wrote:
>
> On Thu, 18 Apr 2019, Gwan-gyeong Mun <gwan-gyeong.mun at intel.com> wrote:
> > The hotplug detection routine of drm_helper_hpd_irq_event() can detect
> > changing of status of connector, but it can not detect changing of
> > properties of the connector.
> > e.g. changing of edid while suspend/resume, changing of dp lanes in dp aux.
> >
> > Following scenario explains one of them; A detection of changing of edid.
> >
> >  1) plug display device to a connector
> >  2) system suspend
> >  3) unplug 1)'s display device and plug the other display device to a
> >     connector
> >  4) system resume
> >
> > To solve explained cases, It fires off KMS hotplug events if
> > drm_helper_probe_detect() says the connector is connected.
> >
> > Testcase: igt/kms_chamelium/hdmi-edid-change-during-hibernate
> > Testcase: igt/kms_chamelium/hdmi-edid-change-during-suspend
> > Testcase: igt/kms_chamelium/dp-edid-change-during-hibernate
> > Testcase: igt/kms_chamelium/dp-edid-change-during-suspend
> >
> > v2: Remove suggested-by line (danvet)
> > Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> > Link: https://lists.freedesktop.org/archives/dri-devel/2019-April/214572.html
>
> Link: is something added by our tooling (dim), not to be added
> yourself. It points at the patch at patchwork using the message-id of
> the patch email.
>
> If you want to refer to some other work, please use References: tag.
>
> BR,
> Jani.
>
>
Hi,
Sorry for misusing of that. I didn't know that.
I'll replace Link to References and resend the patch as soon as possible.
Thank you for letting me know that.
Br,
G.G.
> > ---
> >  drivers/gpu/drm/drm_probe_helper.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> > index 6fd08e04b323..081a849104f2 100644
> > --- a/drivers/gpu/drm/drm_probe_helper.c
> > +++ b/drivers/gpu/drm/drm_probe_helper.c
> > @@ -780,7 +780,8 @@ bool drm_helper_hpd_irq_event(struct drm_device *dev)
> >                             connector->name,
> >                             drm_get_connector_status_name(old_status),
> >                             drm_get_connector_status_name(connector->status));
> > -             if (old_status != connector->status)
> > +             if (old_status != connector->status ||
> > +                 connector->status == connector_status_connected)
> >                       changed = true;
> >       }
> >       drm_connector_list_iter_end(&conn_iter);
>
> --
> Jani Nikula, Intel Open Source Graphics Center
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-- 
Gwan-gyeong Mun