[PATCH 5.11 322/601] drm/probe-helper: Check epoch counter in output_poll_execute()

Greg Kroah-Hartman
2021-05-12T17:31:04Z

From: Noralf Trønnes <noralf@tronnes.org>

[ Upstream commit dc659a4e852b591771fc2e5abb60f4455b0cf316 ]

drm_helper_hpd_irq_event() checks the epoch counter to determine
connector status change. This was introduced in
commit 5186421cbfe2 ("drm: Introduce epoch counter to drm_connector").
Do the same for output_poll_execute() so it can detect other changes
beside connection status value changes.

v2:
- Add Fixes tag (Daniel)

Fixes: 5186421cbfe2 ("drm: Introduce epoch counter to drm_connector")
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210313112545.37527-3-noralf@tronnes.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/drm_probe_helper.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index d6017726cc2a..e5432dcf6999 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -623,6 +623,7 @@ static void output_poll_execute(struct work_struct *work)
struct drm_connector_list_iter conn_iter;
enum drm_connector_status old_status;
bool repoll = false, changed;
+ u64 old_epoch_counter;

if (!dev->mode_config.poll_enabled)
return;
@@ -659,8 +660,9 @@ static void output_poll_execute(struct work_struct *work)

repoll = true;

+ old_epoch_counter = connector->epoch_counter;
connector->status = drm_helper_probe_detect(connector, NULL, false);
- if (old_status != connector->status) {
+ if (old_epoch_counter != connector->epoch_counter) {
const char *old, *new;

/*
@@ -689,6 +691,9 @@ static void output_poll_execute(struct work_struct *work)
connector->base.id,
connector->name,
old, new);
+ DRM_DEBUG_KMS("[CONNECTOR:%d:%s] epoch counter %llu -> %llu\n",
+ connector->base.id, connector->name,
+ old_epoch_counter, connector->epoch_counter);

changed = true;
}
--
2.30.2