From patchwork Tue Aug 17 21:51:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 12442143 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 835E6C4338F for ; Tue, 17 Aug 2021 21:52:32 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 57AEC60240 for ; Tue, 17 Aug 2021 21:52:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 57AEC60240 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6A7BA6E2B4; Tue, 17 Aug 2021 21:52:27 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3762A6E2B6 for ; Tue, 17 Aug 2021 21:52:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1629237145; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Vv3J83mn5oEFhvZc7ZePrJezmGQTOrD4H2yeFP7AvaY=; b=EELMg6HjokgsP5tUmorwpczHA8kwfZhZUTWHIZeJX55Jf3wz3ZbMWWVyTlV605v55P9cKw cgDcKSAZjAZWQdaQp+3UyjqYAhVCW5IWdCTmKd0HHmDNLY9T7nkjbI/vGb5kDSu0Of1GVT ddUskH5muOTF2mo+6I+YOhxvCAgAa5Y= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-109-m8g5vmukNWK_nLK5iPdOPQ-1; Tue, 17 Aug 2021 17:52:21 -0400 X-MC-Unique: m8g5vmukNWK_nLK5iPdOPQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 74570107ACF5; Tue, 17 Aug 2021 21:52:19 +0000 (UTC) Received: from x1.localdomain (unknown [10.39.192.15]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9804510013D6; Tue, 17 Aug 2021 21:52:16 +0000 (UTC) From: Hans de Goede To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Jani Nikula , Lyude , Joonas Lahtinen , Rodrigo Vivi , Imre Deak , Greg Kroah-Hartman , Guenter Roeck , Heikki Krogerus Cc: Hans de Goede , Daniel Vetter , David Airlie , intel-gfx , dri-devel@lists.freedesktop.org, linux-usb@vger.kernel.org Date: Tue, 17 Aug 2021 23:51:57 +0200 Message-Id: <20210817215201.795062-5-hdegoede@redhat.com> In-Reply-To: <20210817215201.795062-1-hdegoede@redhat.com> References: <20210817215201.795062-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Subject: [Intel-gfx] [PATCH 4/8] drm/connector: Add support for out-of-band hotplug notification (v3) X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Add a new drm_connector_oob_hotplug_event() function and oob_hotplug_event drm_connector_funcs member. On some hardware a hotplug event notification may come from outside the display driver / device. An example of this is some USB Type-C setups where the hardware muxes the DisplayPort data and aux-lines but does not pass the altmode HPD status bit to the GPU's DP HPD pin. In cases like this the new drm_connector_oob_hotplug_event() function can be used to report these out-of-band events. Changes in v2: - Make drm_connector_oob_hotplug_event() take a fwnode as argument and have it call drm_connector_find_by_fwnode() internally. This allows making drm_connector_find_by_fwnode() a drm-internal function and avoids code outside the drm subsystem potentially holding on the a drm_connector reference for a longer period. Changes in v3: - Drop the data argument to the drm_connector_oob_hotplug_event function since it is not used atm. This can be re-added later when a use for it actually arises. Tested-by: Heikki Krogerus Signed-off-by: Hans de Goede --- drivers/gpu/drm/drm_connector.c | 27 +++++++++++++++++++++++++++ include/drm/drm_connector.h | 9 +++++++++ 2 files changed, 36 insertions(+) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 7d72bcefa4d6..e0a30e0ee86a 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -2595,6 +2595,33 @@ struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode) return found; } +/** + * drm_connector_oob_hotplug_event - Report out-of-band hotplug event to connector + * @connector: connector to report the event on + * + * On some hardware a hotplug event notification may come from outside the display + * driver / device. An example of this is some USB Type-C setups where the hardware + * muxes the DisplayPort data and aux-lines but does not pass the altmode HPD + * status bit to the GPU's DP HPD pin. + * + * This function can be used to report these out-of-band events after obtaining + * a drm_connector reference through calling drm_connector_find_by_fwnode(). + */ +void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode) +{ + struct drm_connector *connector; + + connector = drm_connector_find_by_fwnode(connector_fwnode); + if (IS_ERR(connector)) + return; + + if (connector->funcs->oob_hotplug_event) + connector->funcs->oob_hotplug_event(connector); + + drm_connector_put(connector); +} +EXPORT_SYMBOL(drm_connector_oob_hotplug_event); + /** * DOC: Tile group diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 8132c48b56ae..79fa34e5ccdb 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1084,6 +1084,14 @@ struct drm_connector_funcs { */ void (*atomic_print_state)(struct drm_printer *p, const struct drm_connector_state *state); + + /** + * @oob_hotplug_event: + * + * This will get called when a hotplug-event for a drm-connector + * has been received from a source outside the display driver / device. + */ + void (*oob_hotplug_event)(struct drm_connector *connector); }; /** @@ -1666,6 +1674,7 @@ drm_connector_is_unregistered(struct drm_connector *connector) DRM_CONNECTOR_UNREGISTERED; } +void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode); const char *drm_get_connector_type_name(unsigned int connector_type); const char *drm_get_connector_status_name(enum drm_connector_status status); const char *drm_get_subpixel_order_name(enum subpixel_order order);