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But now userspace >> shouldn't rely on that, as they can't count with drivers always >> supporting PREMULTI. >> >> Warn if a driver exposes pixel formats with alpha but doesn't expose the >> blend mode property. This way userspace doesn't have to guess. Drivers >> triggering this warning must be fixed. >> >> Signed-off-by: Leandro Ribeiro >> --- >> drivers/gpu/drm/drm_mode_config.c | 21 +++++++++++++++++++++ >> 1 file changed, 21 insertions(+) >> >> diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c >> index 66f7dc37b597..8cca1dea3b3d 100644 >> --- a/drivers/gpu/drm/drm_mode_config.c >> +++ b/drivers/gpu/drm/drm_mode_config.c >> @@ -674,6 +674,25 @@ static void validate_encoder_possible_crtcs(struct drm_encoder *encoder) >> encoder->possible_crtcs, crtc_mask); >> } >> >> +static void validate_blend_mode_for_alpha_formats(struct drm_plane *plane) >> +{ >> + const struct drm_format_info *fmt; >> + u32 i; >> + >> + /* blend mode property supported, no need to check anything */ >> + if (plane->blend_mode_property) >> + return; >> + >> + for (i = 0; i < plane->format_count; i++) { >> + fmt = drm_format_info(plane->format_types[i]); >> + if (fmt->has_alpha) { >> + WARN(1, "[PLANE:%d:%s] pixel format with alpha exposed but " >> + "blend mode not setup", plane->base.id, plane->name); > > I am seeing this warning trigger on a few of my machines in -next. A > couple of those use amdgpu, which I see has already been reported in a > separate thread. Another one uses ast, which I do not see reported > (apologies if I missed it). > > [ +0.000137] ------------[ cut here ]------------ > [ +0.000004] [PLANE:37:plane-1] pixel format with alpha exposed but blend mode not setup > [ +0.000019] WARNING: drivers/gpu/drm/drm_mode_config.c:873 at drm_mode_config_validate+0xa24/0xad0, CPU#0: kworker/0:2/507 > [ +0.000010] Modules linked in: ghash_ce gf128mul nvme ast(+) nvme_core sbsa_gwdt i2c_algo_bit nvme_keyring nvme_auth xgene_hwmon gpio_dwapb fuse scsi_dh_alua scsi_dh_rdac i2c_dev scsi_dh_emc > [ +0.000014] CPU: 0 UID: 0 PID: 507 Comm: kworker/0:2 Not tainted 7.2.0-rc4-next-20260721-00002-g17fa9b81f4c4 #1 PREEMPT(lazy) > [ +0.000003] Hardware name: To be filled by O.E.M Ampere Altra Developer Platform/Ampere Altra Developer Platform, BIOS TianoCore 2.10.100.02 (SYS: 2.10.20 > [ +0.000002] Workqueue: sync_wq local_pci_probe_callback > [ +0.000004] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > [ +0.000003] pc : drm_mode_config_validate+0xa24/0xad0 > [ +0.000002] lr : drm_mode_config_validate+0xa24/0xad0 > [ +0.000002] sp : ffff800082df3c30 > [ +0.000001] x29: ffff800082df3c60 x28: ffffde7ac3633fc2 x27: 0000000000000001 > [ +0.000004] x26: 0000000000000001 x25: 0000000000000002 x24: 0000000000000000 > [ +0.000003] x23: ffff07ffb54b0290 x22: ffff07ffb54b0be0 x21: ffffde7ac36ebb13 > [ +0.000003] x20: 0000000000000001 x19: ffff07ffb54b0000 x18: ffff800082dd5038 > [ +0.000003] x17: 00000000d949c370 x16: 00000000d949c370 x15: ffffde7ac358f156 > [ +0.000002] x14: 0000000000000386 x13: ffff081eeebf2850 x12: 0000000000000000 > [ +0.000003] x11: 0000000000000000 x10: ffffde7ac44b5850 x9 : 738b2a5f3c615c00 > [ +0.000003] x8 : 738b2a5f3c615c00 x7 : 0000000000000000 x6 : 206c65786970205d > [ +0.000003] x5 : ffff081f6fcc917b x4 : ffffde7ac36ebb59 x3 : ffffffffffff0a00 > [ +0.000002] x2 : 0000000000000001 x1 : 0000000000000000 x0 : 000000000000004b > [ +0.000003] Call trace: > [ +0.000001] drm_mode_config_validate+0xa24/0xad0 (P) > [ +0.000003] drm_dev_register+0x44/0x3d8 > [ +0.000004] ast_pci_probe+0x330/0x354 [ast] > [ +0.000016] local_pci_probe_callback+0x68/0xc0 > [ +0.000002] process_scheduled_works+0x23c/0x668 > [ +0.000003] worker_thread+0x218/0x324 > [ +0.000003] kthread+0x130/0x180 > [ +0.000002] ret_from_fork+0x10/0x20 > [ +0.000004] ---[ end trace 0000000000000000 ]--- I am also seeing the same warning on -next for Tegra194 based devices. > If there is any other information I can provide or patches I can test, I > am more than happy to do so. Same. Happy to provide any more information or test any other changes. Jon -- nvpublic