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SubjectRe: [PATCH AUTOSEL 5.4 143/350] drm/nouveau: Resume hotplug interrupts earlier
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huh? Not sure how this got put in the stable queue, but this probably should
be dropped. this was prepatory work for some MST functionality that got added
recently, not a fix.

On Tue, 2019-12-10 at 16:04 -0500, Sasha Levin wrote:
> From: Lyude Paul <lyude@redhat.com>
>
> [ Upstream commit ac0de16a38a9ec7026ca96132e3883c564497068 ]
>
> Currently, we enable hotplug detection only after we re-enable the
> display. However, this is too late if we're planning on sending sideband
> messages during the resume process - which we'll need to do in order to
> reprobe the topology on resume.
>
> So, enable hotplug events before reinitializing the display.
>
> Cc: Juston Li <juston.li@intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Harry Wentland <hwentlan@amd.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Reviewed-by: Sean Paul <sean@poorly.run>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-11-lyude@redhat.com
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> drivers/gpu/drm/nouveau/nouveau_display.c | 19 +++++++++++--------
> 1 file changed, 11 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c
> b/drivers/gpu/drm/nouveau/nouveau_display.c
> index 6f038511a03a9..53f9bceaf17a5 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -407,6 +407,17 @@ nouveau_display_init(struct drm_device *dev, bool
> resume, bool runtime)
> struct drm_connector_list_iter conn_iter;
> int ret;
>
> + /*
> + * Enable hotplug interrupts (done as early as possible, since we need
> + * them for MST)
> + */
> + drm_connector_list_iter_begin(dev, &conn_iter);
> + nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
> + struct nouveau_connector *conn = nouveau_connector(connector);
> + nvif_notify_get(&conn->hpd);
> + }
> + drm_connector_list_iter_end(&conn_iter);
> +
> ret = disp->init(dev, resume, runtime);
> if (ret)
> return ret;
> @@ -416,14 +427,6 @@ nouveau_display_init(struct drm_device *dev, bool
> resume, bool runtime)
> */
> drm_kms_helper_poll_enable(dev);
>
> - /* enable hotplug interrupts */
> - drm_connector_list_iter_begin(dev, &conn_iter);
> - nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
> - struct nouveau_connector *conn = nouveau_connector(connector);
> - nvif_notify_get(&conn->hpd);
> - }
> - drm_connector_list_iter_end(&conn_iter);
> -
> return ret;
> }
>
--
Cheers,
Lyude Paul

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