Thanks Gil for completing the logic here by emitting link status = BAD even for final link failure state. On Thu, Aug 24, 2023 at 1:54 PM Gil Dekel <gildekel@xxxxxxxxxxxx> wrote: > > When a link-training attempt fails, emit a uevent to user space that > includes the trigger property, which in this case will be > link-statue=Bad. Fix the typo above for link-status > > This will allow userspace to parse the uevent property and better > understand the reason for the previous modeset failure. I think we need to add more explanation in the commit message as to current problem of no link status = BAD for final failure wrongly reflects link is good in userspace even when there could have been a failure and black screen. But that this patch in conjunction with proper handling in userspace fixes it. Also here we should mention that this patch also now uses: drm_sysfs_connector_property_event instead of the earlier generic drm_kms_helper_connector_hotplug_event. This will need some changes in other userspaces that parse this else it will cause failures for other userspace once this lands. With all the above changes, Acked-by: Manasi Navare <navaremanasi@xxxxxxxxxxxx> Regards Manasi > > Signed-off-by: Gil Dekel <gildekel@xxxxxxxxxxxx> > > V2: > - init link_status_property inline. > --- > drivers/gpu/drm/i915/display/intel_dp.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c > index e8b10f59e141..328e9f030033 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -42,6 +42,7 @@ > #include <drm/drm_crtc.h> > #include <drm/drm_edid.h> > #include <drm/drm_probe_helper.h> > +#include <drm/drm_sysfs.h> > > #include "g4x_dp.h" > #include "i915_drv.h" > @@ -5995,6 +5996,8 @@ static void intel_dp_modeset_retry_work_fn(struct work_struct *work) > struct intel_dp *intel_dp = > container_of(work, typeof(*intel_dp), modeset_retry_work); > struct drm_connector *connector = &intel_dp->attached_connector->base; > + struct drm_property *link_status_property = > + connector->dev->mode_config.link_status_property; > > /* Set the connector's (and possibly all its downstream MST ports') link > * status to BAD. > @@ -6011,7 +6014,7 @@ static void intel_dp_modeset_retry_work_fn(struct work_struct *work) > } > mutex_unlock(&connector->dev->mode_config.mutex); > /* Send Hotplug uevent so userspace can reprobe */ > - drm_kms_helper_connector_hotplug_event(connector); > + drm_sysfs_connector_property_event(connector, link_status_property); > } > > bool > -- > Gil Dekel, Software Engineer, Google / ChromeOS Display and Graphics
