From 929725bd7eb4eea1f75197d9847f3f1ea5afdad1 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Wed, 31 Jul 2024 19:10:20 +0000
Subject: [PATCH] drm/atomic: allow no-op FB_ID updates for async flips
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User-space is allowed to submit any property in an async flip as
long as the value doesn't change. However we missed one case:
as things stand, the kernel rejects no-op FB_ID changes on
non-primary planes. Fix this by changing the conditional and
skipping drm_atomic_check_prop_changes() only for FB_ID on the
primary plane (instead of skipping for FB_ID on any plane).
Fixes: 0e26cc72c71c ("drm: Refuse to async flip with atomic prop changes")
Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Tested-by: Xaver Hugl <xaver.hugl@kde.org>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Michel Dänzer <michel.daenzer@mailbox.org>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240731191014.878320-1-contact@emersion.fr
---
drivers/gpu/drm/drm_atomic_uapi.c | 15 ++++-----------
1 file changed, 4 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 7609c798d73df..7936c20239551 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -1071,23 +1071,16 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
}
if (async_flip &&
- prop != config->prop_fb_id &&
- prop != config->prop_in_fence_fd &&
- prop != config->prop_fb_damage_clips) {
+ (plane_state->plane->type != DRM_PLANE_TYPE_PRIMARY ||
+ (prop != config->prop_fb_id &&
+ prop != config->prop_in_fence_fd &&
+ prop != config->prop_fb_damage_clips))) {
ret = drm_atomic_plane_get_property(plane, plane_state,
prop, &old_val);
ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
break;
}
- if (async_flip && plane_state->plane->type != DRM_PLANE_TYPE_PRIMARY) {
- drm_dbg_atomic(prop->dev,
- "[OBJECT:%d] Only primary planes can be changed during async flip\n",
- obj->id);
- ret = -EINVAL;
- break;
- }
-
ret = drm_atomic_plane_set_property(plane,
plane_state, file_priv,
prop, prop_value);
--
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