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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 6CC40CA9EB9 for ; Wed, 23 Oct 2019 15:45:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3B54A2084C for ; Wed, 23 Oct 2019 15:45:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406910AbfJWPp1 (ORCPT ); Wed, 23 Oct 2019 11:45:27 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:37738 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404032AbfJWPp1 (ORCPT ); Wed, 23 Oct 2019 11:45:27 -0400 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 2F96528F905; Wed, 23 Oct 2019 16:45:25 +0100 (BST) 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, Boris Brezillon Subject: [PATCH v3 09/21] drm/bridge: Add a drm_bridge_state object Date: Wed, 23 Oct 2019 17:45:00 +0200 Message-Id: <20191023154512.9762-10-boris.brezillon@collabora.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191023154512.9762-1-boris.brezillon@collabora.com> References: <20191023154512.9762-1-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 One of the last remaining objects to not have its atomic state. This is being motivated by our attempt to support runtime bus-format negotiation between elements of the bridge chain. This patch just paves the road for such a feature by adding a new drm_bridge_state object inheriting from drm_private_obj so we can re-use some of the existing state initialization/tracking logic. Signed-off-by: Boris Brezillon --- Changes in v3: * None Changes in v2: * Use drm_for_each_bridge_in_chain() * Rename helpers to be more consistent with the rest of the DRM API * Improve/fix the doc --- drivers/gpu/drm/drm_atomic.c | 39 +++++++ drivers/gpu/drm/drm_atomic_helper.c | 20 ++++ drivers/gpu/drm/drm_bridge.c | 168 +++++++++++++++++++++++++++- include/drm/drm_atomic.h | 3 + include/drm/drm_bridge.h | 118 +++++++++++++++++++ 5 files changed, 343 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 419381abbdd1..6c249ce39380 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -30,6 +30,7 @@ #include #include +#include #include #include #include @@ -1010,6 +1011,44 @@ static void drm_atomic_connector_print_state(struct drm_printer *p, connector->funcs->atomic_print_state(p, state); } +/** + * drm_atomic_add_encoder_bridges - add bridges attached to an encoder + * @state: atomic state + * @encoder: DRM encoder + * + * This function adds all bridges attached to @encoder. This is needed to add + * bridge states to @state and make them available when + * &bridge_funcs.atomic_{check,pre_enable,enable,disable_post_disable}() are + * called + * + * Returns: + * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK + * then the w/w mutex code has detected a deadlock and the entire atomic + * sequence must be restarted. All other errors are fatal. + */ +int +drm_atomic_add_encoder_bridges(struct drm_atomic_state *state, + struct drm_encoder *encoder) +{ + struct drm_bridge_state *bridge_state; + struct drm_bridge *bridge; + + if (!encoder) + return 0; + + DRM_DEBUG_ATOMIC("Adding all bridges for [encoder:%d:%s] to %p\n", + encoder->base.id, encoder->name, state); + + drm_for_each_bridge_in_chain(encoder, bridge) { + bridge_state = drm_atomic_get_bridge_state(state, bridge); + if (IS_ERR(bridge_state)) + return PTR_ERR(bridge_state); + } + + return 0; +} +EXPORT_SYMBOL(drm_atomic_add_encoder_bridges); + /** * drm_atomic_add_affected_connectors - add connectors for crtc * @state: atomic state diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index f02ddffd4960..de985ba7ce2d 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -730,6 +730,26 @@ drm_atomic_helper_check_modeset(struct drm_device *dev, return ret; } + /* + * Iterate over all connectors again, and add all affected bridges to + * the state. + */ + for_each_oldnew_connector_in_state(state, connector, + old_connector_state, + new_connector_state, i) { + struct drm_encoder *encoder; + + encoder = old_connector_state->best_encoder; + ret = drm_atomic_add_encoder_bridges(state, encoder); + if (ret) + return ret; + + encoder = new_connector_state->best_encoder; + ret = drm_atomic_add_encoder_bridges(state, encoder); + if (ret) + return ret; + } + ret = mode_valid(state); if (ret) return ret; diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index c5cf8a9c4237..c53966767782 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -25,6 +25,7 @@ #include #include +#include #include #include @@ -89,6 +90,38 @@ void drm_bridge_remove(struct drm_bridge *bridge) } EXPORT_SYMBOL(drm_bridge_remove); +static struct drm_private_state * +drm_bridge_atomic_duplicate_priv_state(struct drm_private_obj *obj) +{ + struct drm_bridge *bridge = drm_priv_to_bridge(obj); + struct drm_bridge_state *state; + + if (bridge->funcs->atomic_duplicate_state) + state = bridge->funcs->atomic_duplicate_state(bridge); + else + state = drm_atomic_helper_bridge_duplicate_state(bridge); + + return &state->base; +} + +static void +drm_bridge_atomic_destroy_priv_state(struct drm_private_obj *obj, + struct drm_private_state *s) +{ + struct drm_bridge_state *state = drm_priv_to_bridge_state(s); + struct drm_bridge *bridge = drm_priv_to_bridge(obj); + + if (bridge->funcs->atomic_destroy_state) + bridge->funcs->atomic_destroy_state(bridge, state); + else + drm_atomic_helper_bridge_destroy_state(bridge, state); +} + +static const struct drm_private_state_funcs drm_bridge_priv_state_funcs = { + .atomic_duplicate_state = drm_bridge_atomic_duplicate_priv_state, + .atomic_destroy_state = drm_bridge_atomic_destroy_priv_state, +}; + /** * drm_bridge_attach - attach the bridge to an encoder's chain * @@ -114,6 +147,7 @@ EXPORT_SYMBOL(drm_bridge_remove); int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge, struct drm_bridge *previous) { + struct drm_bridge_state *state; LIST_HEAD(tmp_list); int ret; @@ -132,19 +166,39 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge, if (bridge->funcs->attach) { ret = bridge->funcs->attach(bridge); - if (ret < 0) { - bridge->dev = NULL; - bridge->encoder = NULL; - return ret; - } + if (ret < 0) + goto err_reset_bridge; } + if (bridge->funcs->atomic_reset) + state = bridge->funcs->atomic_reset(bridge); + else + state = drm_atomic_helper_bridge_reset(bridge); + + if (IS_ERR(state)) { + ret = PTR_ERR(state); + goto err_detach_bridge; + } + + drm_atomic_private_obj_init(bridge->dev, &bridge->base, + &state->base, + &drm_bridge_priv_state_funcs); + if (previous) list_splice(&tmp_list, &previous->chain_node); else list_splice(&tmp_list, &encoder->bridge_chain); return 0; + +err_detach_bridge: + if (bridge->funcs->detach) + bridge->funcs->detach(bridge); + +err_reset_bridge: + bridge->dev = NULL; + bridge->encoder = NULL; + return ret; } EXPORT_SYMBOL(drm_bridge_attach); @@ -156,6 +210,8 @@ void drm_bridge_detach(struct drm_bridge *bridge) if (WARN_ON(!bridge->dev)) return; + drm_atomic_private_obj_fini(&bridge->base); + if (bridge->funcs->detach) bridge->funcs->detach(bridge); @@ -522,6 +578,108 @@ void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge, } EXPORT_SYMBOL(drm_atomic_bridge_chain_enable); +/** + * drm_atomic_helper_bridge_destroy_state() - Default destroy state helper + * @bridge: the bridge this state refers to + * @state: state object to destroy + * + * Just a simple kfree() for now. + */ +void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge, + struct drm_bridge_state *state) +{ + kfree(state); +} +EXPORT_SYMBOL(drm_atomic_helper_bridge_destroy_state); + +/** + * __drm_atomic_helper_bridge_reset() - Initialize a bridge state to its + * default + * @bridge: the bridge this state is refers to + * @state: bridge state to initialize + * + * For now it's just a memset(0) plus a state->bridge assignment. Might + * be extended in the future. + */ +void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge, + struct drm_bridge_state *state) +{ + memset(state, 0, sizeof(*state)); + state->bridge = bridge; +} +EXPORT_SYMBOL(__drm_atomic_helper_bridge_reset); + +/** + * drm_atomic_helper_bridge_reset() - default &drm_plane_funcs.reset hook for + * bridges + * @bridge: the bridge to reset state on + * + * Resets the atomic state for @bridge by freeing the state pointer (which + * might be NULL, e.g. at driver load time) and allocating a new empty state + * object. + * + * RETURNS: + * A valid drm_bridge_state object in case of success, an ERR_PTR() + * giving the reaon of the failure otherwise. + */ +struct drm_bridge_state * +drm_atomic_helper_bridge_reset(struct drm_bridge *bridge) +{ + struct drm_bridge_state *bridge_state; + + bridge_state = kzalloc(sizeof(*bridge_state), GFP_KERNEL); + if (!bridge_state) + return ERR_PTR(-ENOMEM); + + __drm_atomic_helper_bridge_reset(bridge, bridge_state); + return bridge_state; +} +EXPORT_SYMBOL(drm_atomic_helper_bridge_reset); + +/** + * __drm_atomic_helper_bridge_duplicate_state() - Copy the content of the + * current bridge state into a + * new one + * @bridge: bridge element the old and new states are referring to + * @new: new bridge state to copy to + * + * Should be used by custom &drm_bridge_funcs.atomic_duplicate() implementation + * to copy the previous state into the new object. + */ +void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge, + struct drm_bridge_state *new) +{ + __drm_atomic_helper_private_obj_duplicate_state(&bridge->base, + &new->base); + new->bridge = bridge; +} +EXPORT_SYMBOL(__drm_atomic_helper_bridge_duplicate_state); + +/** + * drm_atomic_helper_duplicate_bridge_state() - Default duplicate state helper + * @bridge: bridge containing the state to duplicate + * + * Default implementation of &drm_bridge_funcs.atomic_duplicate(). + * + * RETURNS: + * a valid state object or NULL if the allocation fails. + */ +struct drm_bridge_state * +drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge) +{ + struct drm_bridge_state *new; + + if (WARN_ON(!bridge->base.state)) + return NULL; + + new = kzalloc(sizeof(*new), GFP_KERNEL); + if (new) + __drm_atomic_helper_bridge_duplicate_state(bridge, new); + + return new; +} +EXPORT_SYMBOL(drm_atomic_helper_bridge_duplicate_state); + #ifdef CONFIG_OF /** * of_drm_find_bridge - find the bridge corresponding to the device node in diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index 927e1205d7aa..1c0a08217712 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -660,6 +660,9 @@ __drm_atomic_get_current_plane_state(struct drm_atomic_state *state, return plane->state; } +int __must_check +drm_atomic_add_encoder_bridges(struct drm_atomic_state *state, + struct drm_encoder *encoder); int __must_check drm_atomic_add_affected_connectors(struct drm_atomic_state *state, struct drm_crtc *crtc); diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 238e84ab63a3..a608c47d1de5 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -25,6 +25,7 @@ #include #include +#include #include #include #include @@ -33,6 +34,23 @@ struct drm_bridge; struct drm_bridge_timings; struct drm_panel; +/** + * struct drm_bridge_state - Atomic bridge state object + * @base: inherit from &drm_private_state + * @bridge: the bridge this state refers to + */ +struct drm_bridge_state { + struct drm_private_state base; + + struct drm_bridge *bridge; +}; + +static inline struct drm_bridge_state * +drm_priv_to_bridge_state(struct drm_private_state *priv) +{ + return container_of(priv, struct drm_bridge_state, base); +} + /** * struct drm_bridge_funcs - drm_bridge control functions */ @@ -338,6 +356,48 @@ struct drm_bridge_funcs { */ void (*atomic_post_disable)(struct drm_bridge *bridge, struct drm_atomic_state *state); + + /** + * @atomic_duplicate_state: + * + * Duplicate the current bridge state object (which is guaranteed to be + * non-NULL). + * + * The atomic_duplicate_state() is optional, the core falls back on + * &drm_atomic_helper_bridge_duplicate_state() when not implemented. + * + * RETURNS: + * A valid drm_bridge_state object or NULL if the allocation fails. + */ + struct drm_bridge_state *(*atomic_duplicate_state)(struct drm_bridge *bridge); + + /** + * @atomic_destroy_state: + * + * Destroy a bridge state object previously allocated by + * &drm_bridge_funcs.atomic_duplicate_state(). + * + * The atomic_destroy_state hook is optional, the coref falls back on + * &drm_atomic_helper_bridge_destroy_state() when not implemented. + */ + void (*atomic_destroy_state)(struct drm_bridge *bridge, + struct drm_bridge_state *state); + + /** + * @atomic_reset: + * + * Reset the bridge to a predefined state (or retrieve its current + * state) and return a &drm_bridge_state object matching this state. + * This function is called at attach time. + * + * The atomic_reset hook is optional, the core falls back on + * &drm_atomic_helper_bridge_reset() when not implemented. + * + * RETURNS: + * A valid drm_bridge_state object in case of success, an ERR_PTR() + * giving the reaon of the failure otherwise. + */ + struct drm_bridge_state *(*atomic_reset)(struct drm_bridge *bridge); }; /** @@ -380,6 +440,8 @@ struct drm_bridge_timings { * struct drm_bridge - central DRM bridge control structure */ struct drm_bridge { + /** @base: inherit from &drm_private_object */ + struct drm_private_obj base; /** @dev: DRM device this bridge belongs to */ struct drm_device *dev; /** @encoder: encoder to which this bridge is connected */ @@ -404,6 +466,12 @@ struct drm_bridge { void *driver_private; }; +static inline struct drm_bridge * +drm_priv_to_bridge(struct drm_private_obj *priv) +{ + return container_of(priv, struct drm_bridge, base); +} + void drm_bridge_add(struct drm_bridge *bridge); void drm_bridge_remove(struct drm_bridge *bridge); struct drm_bridge *of_drm_find_bridge(struct device_node *np); @@ -475,6 +543,56 @@ void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge, void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge, struct drm_atomic_state *state); +void __drm_atomic_helper_bridge_reset(struct drm_bridge *bridge, + struct drm_bridge_state *state); +struct drm_bridge_state * +drm_atomic_helper_bridge_reset(struct drm_bridge *bridge); +void drm_atomic_helper_bridge_destroy_state(struct drm_bridge *bridge, + struct drm_bridge_state *state); +void __drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge, + struct drm_bridge_state *new); +struct drm_bridge_state * +drm_atomic_helper_bridge_duplicate_state(struct drm_bridge *bridge); + +static inline struct drm_bridge_state * +drm_atomic_get_bridge_state(struct drm_atomic_state *state, + struct drm_bridge *bridge) +{ + struct drm_private_state *obj_state; + + obj_state = drm_atomic_get_private_obj_state(state, &bridge->base); + if (!obj_state) + return NULL; + + return drm_priv_to_bridge_state(obj_state); +} + +static inline struct drm_bridge_state * +drm_atomic_get_old_bridge_state(struct drm_atomic_state *state, + struct drm_bridge *bridge) +{ + struct drm_private_state *obj_state; + + obj_state = drm_atomic_get_old_private_obj_state(state, &bridge->base); + if (!obj_state) + return NULL; + + return drm_priv_to_bridge_state(obj_state); +} + +static inline struct drm_bridge_state * +drm_atomic_get_new_bridge_state(struct drm_atomic_state *state, + struct drm_bridge *bridge) +{ + struct drm_private_state *obj_state; + + obj_state = drm_atomic_get_new_private_obj_state(state, &bridge->base); + if (!obj_state) + return NULL; + + return drm_priv_to_bridge_state(obj_state); +} + #ifdef CONFIG_DRM_PANEL_BRIDGE struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel); struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel, -- 2.21.0