Patch "drm/rockchip: cdn-dp: Use drm_connector_helper_hpd_irq_event()" has been added to the 6.12-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/rockchip: cdn-dp: Use drm_connector_helper_hpd_irq_event()

to the 6.12-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-rockchip-cdn-dp-use-drm_connector_helper_hpd_irq_event.patch
and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From 666e1960464140cc4bc9203c203097e70b54c95a Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Tue, 5 Nov 2024 14:38:16 +0100
Subject: drm/rockchip: cdn-dp: Use drm_connector_helper_hpd_irq_event()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Thomas Zimmermann <tzimmermann@suse.de>

commit 666e1960464140cc4bc9203c203097e70b54c95a upstream.

The code for detecting and updating the connector status in
cdn_dp_pd_event_work() has a number of problems.

- It does not aquire the locks to call the detect helper and update
the connector status. These are struct drm_mode_config.connection_mutex
and struct drm_mode_config.mutex.

- It does not use drm_helper_probe_detect(), which helps with the
details of locking and detection.

- It uses the connector's status field to determine a change to
the connector status. The epoch_counter field is the correct one. The
field signals a change even if the connector status' value did not
change.

Replace the code with a call to drm_connector_helper_hpd_irq_event(),
which fixes all these problems.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 81632df69772 ("drm/rockchip: cdn-dp: do not use drm_helper_hpd_irq_event")
Cc: Chris Zhong <zyw@rock-chips.com>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Sandy Huang <hjc@rock-chips.com>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: Andy Yan <andy.yan@rock-chips.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: <stable@vger.kernel.org> # v4.11+
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20241105133848.480407-1-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/rockchip/cdn-dp-core.c |    9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -947,9 +947,6 @@ static void cdn_dp_pd_event_work(struct
 {
 	struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
 						event_work);
-	struct drm_connector *connector = &dp->connector;
-	enum drm_connector_status old_status;
-
 	int ret;
 
 	mutex_lock(&dp->lock);
@@ -1009,11 +1006,7 @@ static void cdn_dp_pd_event_work(struct
 
 out:
 	mutex_unlock(&dp->lock);
-
-	old_status = connector->status;
-	connector->status = connector->funcs->detect(connector, false);
-	if (old_status != connector->status)
-		drm_kms_helper_hotplug_event(dp->drm_dev);
+	drm_connector_helper_hpd_irq_event(&dp->connector);
 }
 
 static int cdn_dp_pd_event(struct notifier_block *nb,


Patches currently in stable-queue which might be from tzimmermann@suse.de are

queue-6.12/drm-rockchip-cdn-dp-use-drm_connector_helper_hpd_irq_event.patch
queue-6.12/drm-client-handle-tiled-displays-better.patch
queue-6.12/drm-modeset-handle-tiled-displays-in-pan_display_atomic.patch
queue-6.12/m68k-vga-fix-i-o-defines.patch