From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794326586; b=0pt1I9dqUcA9H2TonMdxvoJZ9zTuPP5OyqzoF4+JN5VRK7SJdrpiIi4tdMQftwterC/e Bym+eNZASY5b9SYWSN0mkzwb76gv2KhHIEXmT5uHLnQO4LnS+b/VB2HyJw3biOp94btCO IjGKl9yCCAoDTdr4LUocedJJG9c6kOH+qm8OqIjkjJsulUX9R6DQGYr8wNv2RxMSqFwWI 5gfZICPtr3i23oI3BT1CPDBK3SdYg7YDmDNUSu28qStnMQGE6EegsQwY54kcAFd3cKUKC cjIHJoA8ayL+7MNKl8EW+f1X09PepfYHK1hR88q/+2gx7yZg/7lIyDlpT333XuiNVUg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794326586; h=Received:DKIM-Signature:From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:References:In-Reply-To:To:Cc: X-Mailer:X-Developer-Signature:X-Developer-Key; bh=UIwZGk1fss5VEwFZyoqOH1fKZV4VjLTrLWw0MlUbRbs=; b=BcFJIZaR1vsvv0ylV++EZDPVOlhvc4N/AzkUxwDv7h7usmuduqdBdGQXWrGBRa+Kmn8/ OAYKidHxviLf624nRBnbW/D963+bLOCbtyIG1cjaxJqO7YN6lMQ2TVJPUIaSkhuBX3eoE QpNUZjOjr4w5eZY/4wHQ+ktYTh5FbPIXYySVSCktZfHKTmSiApZXY/xFah0eB5r/WArNq dsQTrIpUJukwk0rUSHCnpmQp7N4C8x4KJr+tDCpXWYnFbW8w8+Q/u0mp3e+OeD7/HhTIp XTrltLIte1BR5H7YT+/TWnCxdRGizy5YdzIXuOZdXzbVpDdre8Z5tmg845Zb44oVjsA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=NvsIXLXW; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 12D4960A2609 for ; Tue, 10 Nov 2026 16:03:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=NvsIXLXW Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2AD601F008A6; Tue, 10 Nov 2026 16:03:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794326585; bh=UIwZGk1fss5VEwFZyoqOH1fKZV4VjLTrLWw0MlUbRbs=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=NvsIXLXWr0lAj+bsed51+DS+egBDml9leb/5sFvbfqOVrEY+2U37/pgFFFK8KPNb+ 0igKyAPzo8v7iMGbLaBu8PPfPJVrni6v/xIGn1Mxu/3/vzchWzLKvkfNepobi7mjXc rICeu/LR3LDn4L5/m42onEIWOaZrMumS3pTmFNAWHCv6L39mh4Xps5F7yVeiXA9hVQ MwFrA5lXRh5+MOvHEUleRQx2iygN6TTh4UankXdF54UK1ZzLpeeM1bKAff+00Ehrp6 OHlOhq2EfqyTRLbtUh5Rs8cTOgoaMOjXoWaLq6PssbV9CFHMZOf0+ot47URaT5Dl4N VG+cmv5YFhOOQ== From: Maxime Ripard Date: Tue, 10 Nov 2026 17:02:49 +0100 Subject: [PATCH v9 02/10] drm/atomic: Add drm_atomic_implements_create_state() helper X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261110-drm-reset-state-flag-v9-2-ddb0e26324a0@kernel.org> References: <20261110-drm-reset-state-flag-v9-0-ddb0e26324a0@kernel.org> In-Reply-To: <20261110-drm-reset-state-flag-v9-0-ddb0e26324a0@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Louis Chauvet , Haneen Mohammed , Melissa Wen Cc: Daniel Stone , Harry Wentland , Jocelyn Falempe , =?utf-8?q?Jonas_=C3=85dahl?= , =?utf-8?q?Michel_D=C3=A4nzer?= , Pekka Paalanen , Sebastian Wick , Simon Ser , Victoria Brekenfeld , Xaver Hugl , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Maxime Ripard X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3638; i=mripard@kernel.org; h=from:subject:message-id; bh=t+dM6RtwOtArpaJ7UnLd4NKGqXFn+ejP/ReNUhyWUcU=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDFmfHXSCzq7m25Cjup5/3xbFC1/17xhJp7rzWKln6lg+W 7A09rl3x1QWBmFOBlkxRZYnMmGnl7cvrnKwX/kDZg4rE8gQBi5OAZjI3l2MDdP4S5mMLXkPzowX uSU3a9OG1Aq9rkP6phsnJN2pql3zapvWqwb3/zH8rSvzfjhPWl3Fy1hfnN8rEPX4oeu5izqNdv7 JuuF8hifrn0jlFrD/DRZ3LBfYstnSWdFX3e7x5xv5/Kn+YgA= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D The atomic reset path will need to create pristine default states from scratch for every plane, CRTC, and connector. This requires all of them to implement the atomic_create_state hook. Introduce a drm_atomic_implements_create_state() helper that iterates over all planes, CRTCs, and connectors and returns whether they all provide the hook. Color operations are excluded since they always use drm_atomic_helper_colorop_create_state() directly. This will be used both as a precondition before filling a commit with default states, and to report the device capability to userspace. Reviewed-by: Daniel Stone Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_atomic.c | 49 ++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_atomic.h | 2 ++ 2 files changed, 51 insertions(+) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 81591173265d..7a77051096c9 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1598,10 +1598,59 @@ drm_atomic_get_new_bridge_state(const struct drm_atomic_commit *state, return drm_priv_to_bridge_state(obj_state); } EXPORT_SYMBOL(drm_atomic_get_new_bridge_state); +/** + * drm_atomic_implements_create_state - check if a device supports creating pristine states + * @dev: DRM device + * + * Check whether every plane, CRTC, and connector in @dev implements the + * &drm_plane_funcs.atomic_create_state, &drm_crtc_funcs.atomic_create_state, + * and &drm_connector_funcs.atomic_create_state hooks respectively. These hooks + * are required to create default states from scratch rather than duplicating + * the current state. + * + * Color operations are not checked because they always use + * drm_atomic_helper_colorop_create_state() and do not have a per-driver hook. + * + * Returns: + * True if all objects implement atomic_create_state, false otherwise. + */ +bool drm_atomic_implements_create_state(struct drm_device *dev) +{ + struct drm_connector_list_iter conn_iter; + struct drm_connector *connector; + struct drm_plane *plane; + struct drm_crtc *crtc; + + /* + * colorops don't have an atomic_create_state hook but + * drm_atomic_helper_colorop_create_state() + */ + + drm_for_each_plane(plane, dev) + if (!plane->funcs->atomic_create_state) + return false; + + drm_for_each_crtc(crtc, dev) + if (!crtc->funcs->atomic_create_state) + return false; + + drm_connector_list_iter_begin(dev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { + if (!connector->funcs->atomic_create_state) { + drm_connector_list_iter_end(&conn_iter); + return false; + } + } + drm_connector_list_iter_end(&conn_iter); + + return true; +} +EXPORT_SYMBOL(drm_atomic_implements_create_state); + /** * drm_atomic_add_encoder_bridges - add bridges attached to an encoder * @state: atomic state * @encoder: DRM encoder * diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index 3ae35b09c0cf..72c3d420f40c 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -700,10 +700,12 @@ int drm_crtc_commit_wait(struct drm_crtc_commit *commit); struct drm_atomic_commit * __must_check drm_atomic_commit_alloc(struct drm_device *dev); void drm_atomic_commit_clear(struct drm_atomic_commit *state); +bool drm_atomic_implements_create_state(struct drm_device *dev); + /** * drm_atomic_commit_get - acquire a reference to the atomic state * @state: The atomic state * * Returns a new reference to the @state -- 2.56.0