From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.forwardemail.net (smtp.forwardemail.net [121.127.44.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 03898126C17 for ; Wed, 22 Jul 2026 14:40:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=121.127.44.66 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784731233; cv=none; b=OpTTM1s0xD3NBEfYYgTMQlNXKWzlPd/xOUGGlcvUpPwexKhwDEn0ZXgYuWclBJgM4mR9VWPJ8uF6oA050PJ21jEVE/HPIhiOLa0bclv5wGhpfnryqYXKXya8GS4FTq1+ogrZHfoJ3j8bM8sfowVVCvK0MIkq8wCq7IKFWe9D5UA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784731233; c=relaxed/simple; bh=NZDhhsC6lOFnkegjhkhByZ790MQ9nXjVXSoqQbv/Od8=; h=Mime-Version:Content-Type:Date:Message-Id:Cc:Subject:From:To: References:In-Reply-To; b=FEKiSptVs6FJ6XMXSqXkJtHhd3HIsepEofBwSZsC3gTGoqT5DsklF8qw5OmI+mAnVEkNBnQHNH9/BN0UqkHi3Ign9U9OzV8OglvbjiP2DPKkBb+Qkn3NcfVKpgqMCUwpF2n6/NeghvADE2tXJC4EQMXkvcTsBKvmCiu7bGE/WYs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ubuntu.com; spf=pass smtp.mailfrom=fe-bounces.ubuntu.com; dkim=pass (2048-bit key) header.d=ubuntu.com header.i=@ubuntu.com header.b=kwtFnuNn; arc=none smtp.client-ip=121.127.44.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ubuntu.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=fe-bounces.ubuntu.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ubuntu.com header.i=@ubuntu.com header.b="kwtFnuNn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ubuntu.com; h=In-Reply-To: References: To: From: Subject: Cc: Message-Id: Date: Content-Type: Content-Transfer-Encoding: Mime-Version; q=dns/txt; s=fe-953a8a3ca9; t=1784731225; bh=RD31tW8LmUG6AZAI01B0tujYL1MNyoRdlJ5f+ELAs0g=; b=kwtFnuNng8ib30FqEsJtBwlqWKqy0TO9GBQMxyq9CC5BsNhdkw0VwwzJP4Zw9kzfsm+2zelxc HU/m/XJvaIFbfjqMLy9WnL/TYUgegFzFcDlnEGVeYnHLps8h3DCBAC32U7RzsOhZZpQGh9ym2E5 V4kA2uPX+TXdmKEq2Gx0dfoQMEdLV+5sevaXv+1v1AmEoR+8OzlgzUqbD+nCXHqDP2UgPgoGFFL 38TRj8/wqHDyTu55eFw/dj1WuYjL+6PWB8+D9ZnchMugreY/Gc/EhgTuYEzEQk0vJXaqKbAWtmu 4e3/xW2NAz8sUp1UHR/PzE0dMQrJh4qxUFEkaWgxfsbQ== X-Forward-Email-ID: 6a60d65708d8c87d01d8a86f X-Forward-Email-Sender: rfc822; jpeisach@ubuntu.com, smtp.forwardemail.net, 121.127.44.66 X-Forward-Email-Version: 2.12.0 X-Forward-Email-Website: https://forwardemail.net X-Complaints-To: abuse@forwardemail.net X-Report-Abuse: abuse@forwardemail.net X-Report-Abuse-To: abuse@forwardemail.net Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8; format=Flowed Date: Wed, 22 Jul 2026 10:40:22 -0400 Message-Id: Cc: , Subject: Re: [PATCH] [PATCH] drm/vkms: Advertise PREMULTI blend mode From: "Joshua Peisach" To: "Michail Tatas" , , , , , , , , X-Mailer: aerc 0.21.0 References: In-Reply-To: On Sun Jul 19, 2026 at 8:17 PM EDT, Michail Tatas wrote: > Since we only support pre-multiplied alpha blend mode, > advertise that, otherwise validate_blend_mode_for_alpha_formats() > will throw a WARN. > > Reported-by: syzbot+6245cb95ae707991bffa@syzkaller.appspotmail.com > Signed-off-by: Michail Tatas > --- > > syzbot link: https://syzkaller.appspot.com/bug?extid=3D6245cb95ae707991bf= fa > > drivers/gpu/drm/vkms/vkms_plane.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkm= s_plane.c > index 68cb2a3335e6..a2e5ebee729a 100644 > --- a/drivers/gpu/drm/vkms/vkms_plane.c > +++ b/drivers/gpu/drm/vkms/vkms_plane.c > @@ -246,6 +246,12 @@ struct vkms_plane *vkms_plane_init(struct vkms_devic= e *vkmsdev, > DRM_COLOR_YCBCR_BT601, > DRM_COLOR_YCBCR_FULL_RANGE); > =20 > + /* Since our composer only supports pre-multiplied alpha, > + * advertise only the PREMULTI blend mode. > + */ > + drm_plane_create_blend_mode_property(&plane->base, > + BIT(DRM_MODE_BLEND_PREMULTI)); > + > if (vkms_config_plane_get_default_pipeline(plane_cfg)) > vkms_initialize_colorops(&plane->base); > =20 Hi, Unfortunately, this still causes the warning on my machine. In my config CONFIG_DRM_VKMS is not set. -Josh