[PATCH] drm/nouveau/kms/nv50-: Unconditionally create blend_mode prop for wndws
From: Lyude Paul
Date: Fri Jul 17 2026 - 18:48:32 EST
Since the commit mentioned down below, it looks like we've been triggering
this WARN_ON():
[ 31.477009] ------------[ cut here ]------------
[ 31.477012] [PLANE:66:curs-0] pixel format with alpha exposed but
blend mode not setup
[ 31.477014] WARNING: drivers/gpu/drm/drm_mode_config.c:872 at
drm_mode_config_validate+0x38c/0x4c0, CPU#1: modprobe/1264
[ 31.477125] CPU: 1 UID: 0 PID: 1264 Comm: modprobe Not tainted
7.2.0-rc2Lyude-Test+ #1 PREEMPT(lazy)
[ 31.477129] Hardware name: Micro-Star International Co., Ltd.
MS-7A39/A320M GAMING PRO (MS-7A39), BIOS 1.M4 05/10/2023
[ 31.477132] RIP: 0010:drm_mode_config_validate+0x394/0x4c0
[ 31.477136] Code: 41 3b 9e 80 00 00 00 73 bd 49 8b 46 78 8b 3c 98 e8
c1 3d ff ff 80 78 14 00 74 e1 48 8d 3d 64 e6 e7 01 49 8b 56 18 41 8b 76
50 <67> 48 0f b9 3a 49 8b 46 08 4c 8d 70 f8 49 39 c5 75 97 8b 95 b8 02
[ 31.477139] RSP: 0018:ffffd48e053bb7f8 EFLAGS: 00010202
[ 31.477143] RAX: ffffffffaf1da9c0 RBX: 0000000000000000 RCX: 0000000000000034
[ 31.477145] RDX: ffff8cd883c1feb0 RSI: 0000000000000042 RDI: ffffffffb069f840
[ 31.477148] RBP: ffff8cd88ea3d800 R08: 0000000034325241 R09: ffff8cd88ea3dac0
[ 31.477150] R10: fffffaf5c4043600 R11: ffff8cd88004f600 R12: 0000000000000001
[ 31.477152] R13: ffff8cd88ea3da90 R14: ffff8cd88b9ec038 R15: ffff8cd88ea3dab0
[ 31.477154] FS: 00007fb934898780(0000) GS:ffff8cd9f3a6a000(0000) knlGS:0000000000000000
[ 31.477157] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 31.477160] CR2: 0000555efff79520 CR3: 0000000122cd5000 CR4: 00000000003506f0
[ 31.477162] Call Trace:
[ 31.477165] <TASK>
[ 31.477168] ? nouveau_hwmon_init+0x2d6/0x330 [nouveau]
[ 31.477346] drm_dev_register+0x19d/0x270
[ 31.477352] nouveau_drm_device_init+0x17a/0x230 [nouveau]
[ 31.477523] nouveau_drm_probe+0x13d/0x1e0 [nouveau]
[ 31.477690] local_pci_probe+0x3e/0x90
[ 31.477697] pci_call_probe+0x59/0x190
[ 31.477702] ? srso_return_thunk+0x5/0x5f
[ 31.477706] ? pci_match_device+0x15a/0x180
[ 31.477710] ? pci_assign_irq+0x2d/0x160
[ 31.477714] pci_device_probe+0x95/0x160
[ 31.477719] call_driver_probe+0x26/0x100
[ 31.477724] ? driver_sysfs_add+0x59/0xd0
[ 31.477738] really_probe+0xcc/0x2c0
[ 31.477743] ? srso_return_thunk+0x5/0x5f
[ 31.477749] __driver_probe_device+0x85/0x170
[ 31.477754] driver_probe_device+0x1f/0x90
[ 31.477760] ? __pfx___driver_attach+0x10/0x10
[ 31.477766] __driver_attach+0xcb/0x210
[ 31.477772] bus_for_each_dev+0x85/0xd0
[ 31.477779] bus_add_driver+0x13e/0x220
[ 31.477786] ? __pfx_init_module+0x10/0x10 [nouveau]
[ 31.477979] driver_register+0x75/0xe0
[ 31.477984] ? srso_return_thunk+0x5/0x5f
[ 31.477990] nouveau_drm_init+0x8b/0xff0 [nouveau]
[ 31.478192] do_one_initcall+0x5d/0x300
[ 31.478204] do_init_module+0x86/0x290
[ 31.478212] init_module_from_file+0xd8/0x140
[ 31.478223] idempotent_init_module+0x114/0x310
[ 31.478233] __x64_sys_finit_module+0x71/0xe0
[ 31.478238] do_syscall_64+0xe2/0x630
[ 31.478252] ? srso_return_thunk+0x5/0x5f
[ 31.478257] ? vfs_read+0x165/0x390
[ 31.478267] ? srso_return_thunk+0x5/0x5f
[ 31.478271] ? srso_return_thunk+0x5/0x5f
[ 31.478276] ? switch_fpu_return+0x52/0xe0
[ 31.478282] ? srso_return_thunk+0x5/0x5f
[ 31.478286] ? arch_exit_to_user_mode_prepare.isra.0+0x7e/0x90
[ 31.478292] ? srso_return_thunk+0x5/0x5f
[ 31.478296] ? do_syscall_64+0x11f/0x630
[ 31.478301] ? srso_return_thunk+0x5/0x5f
[ 31.478305] ? arch_exit_to_user_mode_prepare.isra.0+0x7e/0x90
[ 31.478310] ? srso_return_thunk+0x5/0x5f
[ 31.478314] ? do_syscall_64+0x11f/0x630
[ 31.478320] ? srso_return_thunk+0x5/0x5f
[ 31.478324] ? arch_exit_to_user_mode_prepare.isra.0+0x7e/0x90
[ 31.478329] ? srso_return_thunk+0x5/0x5f
[ 31.478334] ? srso_return_thunk+0x5/0x5f
[ 31.478338] ? do_syscall_64+0x99/0x630
[ 31.478343] ? exc_page_fault+0x82/0x1c0
[ 31.478350] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 31.478355] RIP: 0033:0x7fb93410030d
[ 31.478372] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa
48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 5a 0f 00 f7 d8 64 89 01 48
[ 31.478375] RSP: 002b:00007ffc587ce738 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 31.478381] RAX: ffffffffffffffda RBX: 0000562f5fb3da60 RCX: 00007fb93410030d
[ 31.478385] RDX: 0000000000000000 RSI: 0000562f5fb40590 RDI: 000000000000000d
[ 31.478388] RBP: 00007ffc587ce7d0 R08: 0000000000000000 R09: 0000000000000000
[ 31.478391] R10: 0000000000000000 R11: 0000000000000246 R12: 0000562f5fb40590
[ 31.478394] R13: 0000000000040000 R14: 0000562f5fb3db80 R15: 0000000000000009
[ 31.478404] </TASK>
[ 31.478407] ---[ end trace 0000000000000000 ]---
Fix it by making sure we unconditionally call
drm_plane_create_blend_mode_property for all types of wndws, including
those (such as cursors) without a blend_set function.
Fixes: 860e748bddcc ("drm: ensure blend mode supported if pixel format with alpha exposed")
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/dispnv50/wndw.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
index 2635458d52acc..9ec06dceceef5 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -860,6 +860,7 @@ nv50_wndw_new_(const struct nv50_wndw_func *func, struct drm_device *dev,
struct nv50_disp *disp = nv50_disp(dev);
struct nv50_wndw *wndw;
const u64 *format_modifiers;
+ unsigned int blend_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE);
int nformat;
int ret;
@@ -909,12 +910,7 @@ nv50_wndw_new_(const struct nv50_wndw_func *func, struct drm_device *dev,
if (ret)
return ret;
- ret = drm_plane_create_blend_mode_property(&wndw->plane,
- BIT(DRM_MODE_BLEND_PIXEL_NONE) |
- BIT(DRM_MODE_BLEND_PREMULTI) |
- BIT(DRM_MODE_BLEND_COVERAGE));
- if (ret)
- return ret;
+ blend_modes |= BIT(DRM_MODE_BLEND_PREMULTI) | BIT(DRM_MODE_BLEND_COVERAGE);
} else {
ret = drm_plane_create_zpos_immutable_property(&wndw->plane,
nv50_wndw_zpos_default(&wndw->plane));
@@ -922,6 +918,10 @@ nv50_wndw_new_(const struct nv50_wndw_func *func, struct drm_device *dev,
return ret;
}
+ ret = drm_plane_create_blend_mode_property(&wndw->plane, blend_modes);
+ if (ret)
+ return ret;
+
return 0;
}
--
2.55.0