From nobody Sat Sep 26 11:48:29 2026 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EDA952E8B64 for ; Wed, 2 Sep 2026 03:13:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.2 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788318812; cv=none; b=TnE6flnN7ZueZbqGYLRjqsgi2VWhLS1Gq2sWz8Y+0LXpnIP3pxqp8Qdqi9fOrtHkQmQfB5KDOA8w9vIKrxAh2k2o8N3KoalVraHmjRAlDZK54vWkMJCsyv6thor+ECN98OTzSS9EAxQRqs854AQJTGn7JJDt/39MSF1f0xezGHk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788318812; c=relaxed/simple; bh=ZCFXqD0qH+frJd8FQxXIN9FL/o/eJwoHGHcxHsrk2GI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=qLUKD6UGN5m2lNt8fL7Hisb5Fvp1LKMpU+aiXA9NMTQGajPlkTxxkhpvUHd/iFuAWMvOdr6En64RM5G9MieZ4Kp7AXBh3Vihb7HvaPoFc1KH8j+he5uMAfUQjdkF0wsqfhXmZrJ4nTvjI7+PIeeMxWURdkHFn8D/1THA4itx7dk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=gM0QXyEC; arc=none smtp.client-ip=117.135.210.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="gM0QXyEC" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=Xd Olvnf0kNLdmnj7QhhCR0Qpd7tZIaYX8X0Qtv2j1ls=; b=gM0QXyEC+cBDkj+xBQ PxOl9R32S26qR4laebtgHMsPbH+/KrZ7lwIqUUOsH+7gEXFKGHcxN4EfS8Oshf9c CGxnu9gZQu/oqnriKLiTq896cBOnMhO1l/IGUN+DOGnMpzJIyFBiWeHlglkZ2Xbf 8F4SaqNdw25qrHOgwknzyVs7I= Received: from localhost.localdomain (unknown []) by gzsmtp2 (Coremail) with SMTP id PSgvCgDnrxQilJdqv626OA--.15776S2; Wed, 02 Sep 2026 11:12:35 +0800 (CST) From: oushixiong1025@163.com To: Maarten Lankhorst Cc: Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Shixiong Ou Subject: [PATCH] drm/modeset-helper: Add blend mode property to the legacy primary plane Date: Wed, 2 Sep 2026 11:12:32 +0800 Message-Id: <20260902031232.165532-1-oushixiong1025@163.com> X-Mailer: git-send-email 2.25.1 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 X-CM-TRANSID: PSgvCgDnrxQilJdqv626OA--.15776S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7WFy5ArW7Cw4DJrW3ZFW5Jrb_yoW8CryrpF sxCFZ8tw1rtFs3Ja4rC392ya15Wan3Ga48Kry2q3sI93ZxKry3Arn8Gr17KFy7Jr4xJr1a g39rAr1DZF1UuaUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jFa0PUUUUU= X-CM-SenderInfo: xrxvxxx0lr0wirqskqqrwthudrp/xtbC-QOtvGqXlCNMxAAA3t Content-Type: text/plain; charset="utf-8" From: Shixiong Ou The primary plane created by drm_crtc_init() exposes ARGB8888, which has an alpha channel, but never gets a "pixel blend mode" property, so drm_mode_config_validate() warns for every driver using this helper (radeon, gma500, legacy amdgpu DCE). Advertise only DRM_MODE_BLEND_PREMULTI, the mode userspace always assumed when the property was absent. Fixes: 860e748bddcc ("drm: ensure blend mode supported if pixel format with= alpha exposed") Signed-off-by: Shixiong Ou --- drivers/gpu/drm/drm_modeset_helper.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/drm_modeset_helper.c b/drivers/gpu/drm/drm_mod= eset_helper.c index e54584da4c3d..4c59e82af2f1 100644 --- a/drivers/gpu/drm/drm_modeset_helper.c +++ b/drivers/gpu/drm/drm_modeset_helper.c @@ -23,6 +23,7 @@ #include =20 #include +#include #include #include #include @@ -160,6 +161,17 @@ int drm_crtc_init(struct drm_device *dev, struct drm_c= rtc *crtc, */ primary->format_default =3D true; =20 + /* + * safe_modeset_formats[] includes ARGB8888, which has an alpha + * channel. Advertise the blend mode userspace has always assumed + * for such planes when the "pixel blend mode" property was absent, + * to satisfy drm_mode_config_validate(). + */ + ret =3D drm_plane_create_blend_mode_property(primary, + BIT(DRM_MODE_BLEND_PREMULTI)); + if (ret) + goto err_drm_plane_cleanup; + ret =3D drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs, NULL); if (ret) goto err_drm_plane_cleanup; --=20 2.25.1 No virus found Checked by Hillstone Network AntiVirus