[PATCH] drm: Fix output poll work for drm_kms_helper_poll=n

[Imre Deak]

On Sat, Mar 02, 2024 at 12:55:48PM +0300, Dmitry Baryshkov wrote:
> On Fri, 1 Mar 2024 at 18:22, Imre Deak <imre.deak at intel.com> wrote:
> >
> > If drm_kms_helper_poll=n the output poll work will only get scheduled
> > from drm_helper_probe_single_connector_modes() to handle a delayed
> > hotplug event. Since polling is disabled the work in this case should
> > just call drm_kms_helper_hotplug_event() w/o detecting the state of
> > connectors and rescheduling the work.
> >
> > After commit d33a54e3991d after a delayed hotplug event above the
> > connectors did get re-detected in the poll work and the work got
> > re-scheduled periodically (since poll_running is also false if
> > drm_kms_helper_poll=n), in effect ignoring the drm_kms_helper_poll=n
> > kernel param.
> >
> > Fix the above by calling only drm_kms_helper_hotplug_event() for a
> > delayed hotplug event if drm_kms_helper_hotplug_event=n, as was done
> > before d33a54e3991d.
> >
> > Cc: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> > Reported-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Fixes: d33a54e3991d ("drm/probe_helper: sort out poll_running vs poll_enabled")
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>

Patch is pushed to drm-misc-fixes, thanks for the report and review.

> 
> > Signed-off-by: Imre Deak <imre.deak at intel.com>
> > ---
> >  drivers/gpu/drm/drm_probe_helper.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> -- 
> With best wishes
> Dmitry