From afd7d2cf798deb564b91a831338da426312b3555 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 4 Feb 2020 16:01:43 +0100
Subject: drm/fbdev-helper: don't force restores
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Git-commit: 64914da24ea95d2b2f7017d014d74c26005d8780
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
Instead check for master status, in case we've raced.
This is the last exception to the general rule that we restore fbcon
only when there's no master active. Compositors are supposed to drop
their master status before they switch to a different console back to
text mode (or just switch to text mode directly, without a vt switch).
This is known to break some subtests of kms_fbcon_fbt in igt, but they're
just wrong - it does a graphics/text mode switch for the vt without
updating the master status.
Also add a comment to the drm_client->restore hook that this is expected
going forward from all clients (there's currently just one).
v2: Also drop the force in pan_display
v3: Restore the _force to pan_display, this actually means _locked in that
path. Spotted by Noralf.
Cc: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Tested-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200204150146.2006481-3-daniel.vetter@ffwll.ch
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/drm_fb_helper.c | 12 +-----------
include/drm/drm_client.h | 5 +++++
2 files changed, 6 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 4c7cbce7bae7..672934e0eeed 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -250,17 +250,7 @@ int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
return 0;
mutex_lock(&fb_helper->lock);
- /*
- * TODO:
- * We should bail out here if there is a master by dropping _force.
- * Currently these igt tests fail if we do that:
- * - kms_fbcon_fbt@psr
- * - kms_fbcon_fbt@psr-suspend
- *
- * So first these tests need to be fixed so they drop master or don't
- * have an fd open.
- */
- ret = drm_client_modeset_commit_force(&fb_helper->client);
+ ret = drm_client_modeset_commit(&fb_helper->client);
do_delayed = fb_helper->delayed_hotplug;
if (do_delayed)
diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h
index 5cf2c5dd8b1e..d01d311023ac 100644
--- a/include/drm/drm_client.h
+++ b/include/drm/drm_client.h
@@ -44,6 +44,11 @@ struct drm_client_funcs {
* returns zero gets the privilege to restore and no more clients are
* called. This callback is not called after @unregister has been called.
*
+ * Note that the core does not guarantee exclusion against concurrent
+ * drm_open(). Clients need to ensure this themselves, for example by
+ * using drm_master_internal_acquire() and
+ * drm_master_internal_release().
+ *
* This callback is optional.
*/
int (*restore)(struct drm_client_dev *client);
--
2.28.0