From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38AE5C432C3 for ; Tue, 3 Dec 2019 14:15:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1A8CD2084B for ; Tue, 3 Dec 2019 14:15:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726640AbfLCOPb (ORCPT ); Tue, 3 Dec 2019 09:15:31 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:59008 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726598AbfLCOPb (ORCPT ); Tue, 3 Dec 2019 09:15:31 -0500 Received: from localhost.localdomain (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id C3DAC290682; Tue, 3 Dec 2019 14:15:29 +0000 (GMT) From: Boris Brezillon To: dri-devel@lists.freedesktop.org Cc: Lucas Stach , Chris Healy , Andrey Smirnov , Nikita Yushchenko , kernel@collabora.com, Daniel Vetter , Inki Dae , Joonyoung Shim , Seung-Woo Kim , Kyungmin Park , Thierry Reding , Sam Ravnborg , Philipp Zabel , Rob Clark , Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Rob Herring , Mark Rutland , devicetree@vger.kernel.org, Eric Anholt , Boris Brezillon , Laurent Pinchart Subject: [PATCH v4 10/11] drm/bridge: Add an ->atomic_check() hook Date: Tue, 3 Dec 2019 15:15:14 +0100 Message-Id: <20191203141515.3597631-11-boris.brezillon@collabora.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191203141515.3597631-1-boris.brezillon@collabora.com> References: <20191203141515.3597631-1-boris.brezillon@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org So that bridge drivers have a way to check/reject an atomic operation. The drm_atomic_bridge_chain_check() (which is just a wrapper around the ->atomic_check() hook) is called in place of drm_bridge_chain_mode_fixup() (when ->atomic_check() is not implemented, the core falls back on ->mode_fixup(), so the behavior should stay the same for existing bridge drivers). Signed-off-by: Boris Brezillon Reviewed-by: Neil Armstrong Reviewed-by: Laurent Pinchart --- Changes in v4: * Add R-bs Changes in v3: * None Changes in v2: * Clarify the fact that ->atomic_check() is replacing ->mode_fixup() --- drivers/gpu/drm/drm_atomic_helper.c | 12 +++--- drivers/gpu/drm/drm_bridge.c | 62 +++++++++++++++++++++++++++++ include/drm/drm_bridge.h | 29 +++++++++++++- 3 files changed, 96 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index e2f7f336a2d2..a358f81670e9 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -437,12 +437,12 @@ mode_fixup(struct drm_atomic_state *state) funcs = encoder->helper_private; bridge = drm_bridge_chain_get_first_bridge(encoder); - ret = drm_bridge_chain_mode_fixup(bridge, - &new_crtc_state->mode, - &new_crtc_state->adjusted_mode); - if (!ret) { - DRM_DEBUG_ATOMIC("Bridge fixup failed\n"); - return -EINVAL; + ret = drm_atomic_bridge_chain_check(bridge, + new_crtc_state, + new_conn_state); + if (ret) { + DRM_DEBUG_ATOMIC("Bridge atomic check failed\n"); + return ret; } if (funcs && funcs->atomic_check) { diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 15b21ff6f1fe..557c29cae51b 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -624,6 +624,68 @@ void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge, } EXPORT_SYMBOL(drm_atomic_bridge_chain_enable); +static int drm_atomic_bridge_check(struct drm_bridge *bridge, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + if (bridge->funcs->atomic_check) { + struct drm_bridge_state *bridge_state; + int ret; + + bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state, + bridge); + if (WARN_ON(!bridge_state)) + return -EINVAL; + + ret = bridge->funcs->atomic_check(bridge, bridge_state, + crtc_state, conn_state); + if (ret) + return ret; + } else if (bridge->funcs->mode_fixup) { + if (!bridge->funcs->mode_fixup(bridge, &crtc_state->mode, + &crtc_state->adjusted_mode)) + return -EINVAL; + } + + return 0; +} + +/** + * drm_atomic_bridge_chain_check() - Do an atomic check on the bridge chain + * @bridge: bridge control structure + * @crtc_state: new CRTC state + * @conn_state: new connector state + * + * Calls &drm_bridge_funcs.atomic_check() (falls back on + * &drm_bridge_funcs.mode_fixup()) op for all the bridges in the encoder chain, + * starting from the last bridge to the first. These are called before calling + * &drm_encoder_helper_funcs.atomic_check() + * + * RETURNS: + * 0 on success, a negative error code on failure + */ +int drm_atomic_bridge_chain_check(struct drm_bridge *bridge, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct drm_encoder *encoder = bridge->encoder; + struct drm_bridge *iter; + + list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) { + int ret; + + ret = drm_atomic_bridge_check(iter, crtc_state, conn_state); + if (ret) + return ret; + + if (iter == bridge) + break; + } + + return 0; +} +EXPORT_SYMBOL(drm_atomic_bridge_chain_check); + /** * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its * default diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index b80c3cac3203..8206ad90ad2d 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -128,7 +128,9 @@ struct drm_bridge_funcs { * this function passes all other callbacks must succeed for this * configuration. * - * The @mode_fixup callback is optional. + * The mode_fixup callback is optional. &drm_bridge_funcs.mode_fixup() + * is not called when &drm_bridge_funcs.atomic_check() is implemented, + * so only one of them should be provided. * * NOTE: * @@ -385,6 +387,28 @@ struct drm_bridge_funcs { void (*atomic_destroy_state)(struct drm_bridge *bridge, struct drm_bridge_state *state); + /** + * @atomic_check: + * + * This method is responsible for checking bridge state correctness. + * It can also check the state of the surrounding components in chain + * to make sure the whole pipeline can work properly. + * + * &drm_bridge_funcs.atomic_check() hooks are called in reverse + * order (from the last to the first bridge). + * + * This method is optional. &drm_bridge_funcs.mode_fixup() is not + * called when &drm_bridge_funcs.atomic_check() is implemented, so only + * one of them should be provided. + * + * RETURNS: + * zero if the check passed, a negative error code otherwise. + */ + int (*atomic_check)(struct drm_bridge *bridge, + struct drm_bridge_state *bridge_state, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state); + /** * @atomic_reset: * @@ -552,6 +576,9 @@ void drm_bridge_chain_mode_set(struct drm_bridge *bridge, void drm_bridge_chain_pre_enable(struct drm_bridge *bridge); void drm_bridge_chain_enable(struct drm_bridge *bridge); +int drm_atomic_bridge_chain_check(struct drm_bridge *bridge, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state); void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge, struct drm_atomic_state *state); void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge, -- 2.23.0