This is a note to let you know that I've just added the patch titled
drm/atomic-helper: relax unregistered connector check
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-atomic-helper-relax-unregistered-connector-check.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 07d5dedb1e7c2b60371560a965a85fa9b0863ca7
Author: Simon Ser <contact@xxxxxxxxxxx>
Date: Thu Oct 5 13:16:32 2023 +0000
drm/atomic-helper: relax unregistered connector check
[ Upstream commit 2b7947bd32e243c52870d54141d3b4ea6775e63d ]
The driver might pull connectors which weren't submitted by
user-space into the atomic state. For instance,
intel_dp_mst_atomic_master_trans_check() pulls in connectors
sharing the same DP-MST stream. However, if the connector is
unregistered, this later fails with:
[ 559.425658] i915 0000:00:02.0: [drm:drm_atomic_helper_check_modeset] [CONNECTOR:378:DP-7] is not registered
Skip the unregistered connector check to allow user-space to turn
off connectors one-by-one.
See this wlroots issue:
https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3407
Previous discussion:
https://lore.kernel.org/intel-gfx/Y6GX7z17WmDSKwta@xxxxxxxxxxxxxxxxxxxxxxx/
Signed-off-by: Simon Ser <contact@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231005131623.114379-1-contact@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index d0a8c22cbc4b8..070248597d27c 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -289,7 +289,8 @@ static int
update_connector_routing(struct drm_atomic_state *state,
struct drm_connector *connector,
struct drm_connector_state *old_connector_state,
- struct drm_connector_state *new_connector_state)
+ struct drm_connector_state *new_connector_state,
+ bool added_by_user)
{
const struct drm_connector_helper_funcs *funcs;
struct drm_encoder *new_encoder;
@@ -338,9 +339,13 @@ update_connector_routing(struct drm_atomic_state *state,
* there's a chance the connector may have been destroyed during the
* process, but it's better to ignore that then cause
* drm_atomic_helper_resume() to fail.
+ *
+ * Last, we want to ignore connector registration when the connector
+ * was not pulled in the atomic state by user-space (ie, was pulled
+ * in by the driver, e.g. when updating a DP-MST stream).
*/
if (!state->duplicated && drm_connector_is_unregistered(connector) &&
- crtc_state->active) {
+ added_by_user && crtc_state->active) {
drm_dbg_atomic(connector->dev,
"[CONNECTOR:%d:%s] is not registered\n",
connector->base.id, connector->name);
@@ -619,7 +624,10 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
struct drm_connector *connector;
struct drm_connector_state *old_connector_state, *new_connector_state;
int i, ret;
- unsigned int connectors_mask = 0;
+ unsigned int connectors_mask = 0, user_connectors_mask = 0;
+
+ for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i)
+ user_connectors_mask |= BIT(i);
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
bool has_connectors =
@@ -684,7 +692,8 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
*/
ret = update_connector_routing(state, connector,
old_connector_state,
- new_connector_state);
+ new_connector_state,
+ BIT(i) & user_connectors_mask);
if (ret)
return ret;
if (old_connector_state->crtc) {
