Received: by 2002:a05:6a10:9848:0:0:0:0 with SMTP id x8csp1736819pxf; Fri, 26 Mar 2021 13:44:11 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyWRNL0T4BS4/Czd9bfqBrj4KqreDNsqMJWuCD4rCNmJwhNMz827xjBqwH5ZMilg+qFtTlT X-Received: by 2002:a17:906:4dce:: with SMTP id f14mr17005327ejw.349.1616791450950; Fri, 26 Mar 2021 13:44:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1616791450; cv=none; d=google.com; s=arc-20160816; b=do+0hhwdfPLGKKVJ4sY61wbCiwV6Ba7Y89Ahr+ZU9fbsj2YYnQTmZ4OZaMXtMu5PGV RleKasbdMzUHARGbj674wFj/CUbJMl84gyHLCB075M508Lh2ZMM/GG5hbByZV1R7euym avLnIAgdt9KIO09Q8WGFtrrWT2by7wqEsDh7aYTC8uXk7cyXJ5B31iyuLmLr21DTytL+ yRBsJWv11AjdtXfCg5MzN4dijIGeiS4KZwwZhZYJ03SGg6CF3ovgfny7Ihs9G0gZHW+1 Y0R7Qc2XU5o2L+kTYOa2jw0arlHlbD+myiaYgOi4E0SEistU/LFnf5nfopCwJjc0BvmH 7wkA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=mRyF/3d0B6DkLPeoF53/2vrBY6ETrLpG7CxS3AogNps=; b=Rbv3uSa3CQRZm3M4jL4wmDu5jSmv2/0831ZenAK2SimdsjToPHNkJsiETnb7ol51Dw eOUkn41dFMlKd6hqhXnq4H3bR0wV1zUFDhsQtzKatEUiBWCvJoFh7RoFSUA6/wjcqW/M jlvY+zZcaJOW+ZPmMoY0uSDIWuuhOzusv8TjdaqBznORPtVUxMqlZY6xflE1qu98GCYZ riJ9ARxEyeH9cVGQkMQzzRS+f0CyTLAZHSy7S7yfFqSMfDoJuIec7ZGC5vKjhG++RkKe zipTQLhlkoLPbZ3kNoIMiex3OPoemwIsLvcfRRDAdK8lxUwJHqE20AiRbTuDL8coMgkD Sf4w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=HKMjR9xl; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id lf9si2104256ejc.716.2021.03.26.13.43.48; Fri, 26 Mar 2021 13:44:10 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=HKMjR9xl; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230127AbhCZUja (ORCPT + 99 others); Fri, 26 Mar 2021 16:39:30 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:27885 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230316AbhCZUjG (ORCPT ); Fri, 26 Mar 2021 16:39:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1616791145; 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=mRyF/3d0B6DkLPeoF53/2vrBY6ETrLpG7CxS3AogNps=; b=HKMjR9xlH6Chy5O0am06JNGqKKiahwftGCoD95Omb//dPjV8Ey6h4hshIwjbcojgdffqhz rFBqovF/zTPdJQrtNSNiGiDGW2FlnFVWTjUflkS/QbSAd7hRugS3w76BCKcXQiadW94T9s QCwVOQf2fWKdOcOqpJxn50aZc5qN8ow= 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-459--5BjhJDHMPCRAZdNC-58yA-1; Fri, 26 Mar 2021 16:39:04 -0400 X-MC-Unique: -5BjhJDHMPCRAZdNC-58yA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9F2CE1009E2D; Fri, 26 Mar 2021 20:39:02 +0000 (UTC) Received: from Whitewolf.lyude.net (ovpn-114-133.rdu2.redhat.com [10.10.114.133]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0EBEC5DDAD; Fri, 26 Mar 2021 20:38:53 +0000 (UTC) From: Lyude Paul To: nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie , Daniel Vetter , Harry Wentland , Leo Li , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Rob Clark , Sean Paul , Ben Skeggs , Thierry Reding , Jonathan Hunter , Hyun Kwon , Michal Simek , Luben Tuikov , Oleg Vasilev , Mikita Lipski , Eryk Brol , Rodrigo Siqueira , "Jerry (Fangzhi) Zuo" , Chris Park , Sam Ravnborg , Joe Perches , Vasily Khoruzhick , =?UTF-8?q?Guido=20G=C3=BCnther?= , Boris Brezillon , Andy Yan , Marek Szyprowski , Tomi Valkeinen , Swapnil Jakhade , Yuti Amonkar , Jyri Sarha , Julia Lawall , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Imre Deak , Matt Roper , Lucas De Marchi , linux-kernel@vger.kernel.org (open list), linux-arm-msm@vger.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU), freedreno@lists.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO GPU), linux-tegra@vger.kernel.org (open list:DRM DRIVERS FOR NVIDIA TEGRA), linux-arm-kernel@lists.infradead.org (moderated list:ARM/ZYNQ ARCHITECTURE) Subject: [PATCH v2 05/20] drm/dp: Add backpointer to drm_device in drm_dp_aux Date: Fri, 26 Mar 2021 16:37:52 -0400 Message-Id: <20210326203807.105754-6-lyude@redhat.com> In-Reply-To: <20210326203807.105754-1-lyude@redhat.com> References: <20210326203807.105754-1-lyude@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is something that we've wanted for a while now: the ability to actually look up the respective drm_device for a given drm_dp_aux struct. This will also allow us to transition over to using the drm_dbg_*() helpers for debug message printing, as we'll finally have a drm_device to reference for doing so. Note that there is one limitation with this - because some DP AUX adapters exist as platform devices which are initialized independently of their respective DRM devices, one cannot rely on drm_dp_aux->drm_dev to always be non-NULL until drm_dp_aux_register() has been called. We make sure to point this out in the documentation for struct drm_dp_aux. Signed-off-by: Lyude Paul --- drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 1 + .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 1 + drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 1 + drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c | 1 + drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 1 + drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 1 + drivers/gpu/drm/bridge/tc358767.c | 1 + drivers/gpu/drm/bridge/ti-sn65dsi86.c | 1 + drivers/gpu/drm/drm_dp_aux_dev.c | 6 ++++++ drivers/gpu/drm/drm_dp_mst_topology.c | 1 + drivers/gpu/drm/i915/display/intel_dp_aux.c | 1 + drivers/gpu/drm/msm/edp/edp.h | 3 +-- drivers/gpu/drm/msm/edp/edp_aux.c | 5 +++-- drivers/gpu/drm/msm/edp/edp_ctrl.c | 2 +- drivers/gpu/drm/nouveau/nouveau_connector.c | 1 + drivers/gpu/drm/radeon/atombios_dp.c | 1 + drivers/gpu/drm/tegra/dpaux.c | 1 + drivers/gpu/drm/xlnx/zynqmp_dp.c | 1 + include/drm/drm_dp_helper.h | 9 ++++++++- 19 files changed, 33 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c index a3ba9ca11e98..6d35da65e09f 100644 --- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c +++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c @@ -188,6 +188,7 @@ void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector) { amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd; amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer; + amdgpu_connector->ddc_bus->aux.drm_dev = amdgpu_connector->base.dev; drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux); amdgpu_connector->ddc_bus->has_aux = true; } diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c index 73cdb9fe981a..b8b69c33fb2b 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c @@ -434,6 +434,7 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm, link_index); aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer; aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc; + aconnector->dm_dp_aux.aux.drm_dev = dm->ddev; drm_dp_aux_init(&aconnector->dm_dp_aux.aux); drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux, diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c index aa6cda458eb9..e33cd077595a 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c @@ -537,6 +537,7 @@ static int anx6345_bridge_attach(struct drm_bridge *bridge, /* Register aux channel */ anx6345->aux.name = "DP-AUX"; anx6345->aux.dev = &anx6345->client->dev; + anx6345->aux.drm_dev = bridge->dev; anx6345->aux.transfer = anx6345_aux_transfer; err = drm_dp_aux_register(&anx6345->aux); diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c index f20558618220..5e6a0ed39199 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c @@ -905,6 +905,7 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge, /* Register aux channel */ anx78xx->aux.name = "DP-AUX"; anx78xx->aux.dev = &anx78xx->client->dev; + anx78xx->aux.drm_dev = bridge->dev; anx78xx->aux.transfer = anx78xx_aux_transfer; err = drm_dp_aux_register(&anx78xx->aux); diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index f115233b1cb9..550814ca2139 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -1765,6 +1765,7 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev) dp->aux.name = "DP-AUX"; dp->aux.transfer = analogix_dpaux_transfer; dp->aux.dev = dp->dev; + dp->aux.drm_dev = drm_dev; ret = drm_dp_aux_register(&dp->aux); if (ret) diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c index d966a33743b5..fe821ad628ec 100644 --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c @@ -1674,6 +1674,7 @@ static int cdns_mhdp_attach(struct drm_bridge *bridge, dev_dbg(mhdp->dev, "%s\n", __func__); + mhdp->aux.drm_dev = bridge->dev; ret = drm_dp_aux_register(&mhdp->aux); if (ret < 0) return ret; diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index da89922721ed..23a6f90b694b 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1414,6 +1414,7 @@ static int tc_bridge_attach(struct drm_bridge *bridge, if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) return 0; + tc->aux.drm_dev = drm; ret = drm_dp_aux_register(&tc->aux); if (ret < 0) return ret; diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 88df4dd0f39d..8e24272bbf00 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -362,6 +362,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge, return -EINVAL; } + pdata->aux.drm_dev = bridge->dev; ret = drm_dp_aux_register(&pdata->aux); if (ret < 0) { drm_err(bridge->dev, "Failed to register DP AUX channel: %d\n", ret); diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c index e25181bf2c48..06b374cae956 100644 --- a/drivers/gpu/drm/drm_dp_aux_dev.c +++ b/drivers/gpu/drm/drm_dp_aux_dev.c @@ -278,6 +278,12 @@ void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux) if (!aux_dev) /* attach must have failed */ return; + /* + * As some AUX adapters may exist as platform devices which outlive their respective DRM + * devices, we clear drm_dev to ensure that we never accidentally reference a stale pointer + */ + aux->drm_dev = NULL; + mutex_lock(&aux_idr_mutex); idr_remove(&aux_idr, aux_dev->index); mutex_unlock(&aux_idr_mutex); diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 42a0c6888c33..1a7a8b085de4 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2350,6 +2350,7 @@ drm_dp_mst_add_port(struct drm_device *dev, port->aux.is_remote = true; /* initialize the MST downstream port's AUX crc work queue */ + port->aux.drm_dev = dev; drm_dp_remote_aux_init(&port->aux); /* diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c index 7e83bc2cc34a..c4b446d6a042 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_aux.c +++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c @@ -682,6 +682,7 @@ void intel_dp_aux_init(struct intel_dp *intel_dp) else intel_dp->get_aux_send_ctl = g4x_get_aux_send_ctl; + intel_dp->aux.drm_dev = &dev_priv->drm; drm_dp_aux_init(&intel_dp->aux); /* Failure to allocate our preferred name is not critical */ diff --git a/drivers/gpu/drm/msm/edp/edp.h b/drivers/gpu/drm/msm/edp/edp.h index eb34243dad53..8590f2ce274d 100644 --- a/drivers/gpu/drm/msm/edp/edp.h +++ b/drivers/gpu/drm/msm/edp/edp.h @@ -46,8 +46,7 @@ void edp_bridge_destroy(struct drm_bridge *bridge); struct drm_connector *msm_edp_connector_init(struct msm_edp *edp); /* AUX */ -void *msm_edp_aux_init(struct device *dev, void __iomem *regbase, - struct drm_dp_aux **drm_aux); +void *msm_edp_aux_init(struct msm_edp *edp, void __iomem *regbase, struct drm_dp_aux **drm_aux); void msm_edp_aux_destroy(struct device *dev, struct edp_aux *aux); irqreturn_t msm_edp_aux_irq(struct edp_aux *aux, u32 isr); void msm_edp_aux_ctrl(struct edp_aux *aux, int enable); diff --git a/drivers/gpu/drm/msm/edp/edp_aux.c b/drivers/gpu/drm/msm/edp/edp_aux.c index df10a0196d94..e3d85c622cfb 100644 --- a/drivers/gpu/drm/msm/edp/edp_aux.c +++ b/drivers/gpu/drm/msm/edp/edp_aux.c @@ -184,9 +184,9 @@ static ssize_t edp_aux_transfer(struct drm_dp_aux *drm_aux, return ret; } -void *msm_edp_aux_init(struct device *dev, void __iomem *regbase, - struct drm_dp_aux **drm_aux) +void *msm_edp_aux_init(struct msm_edp *edp, void __iomem *regbase, struct drm_dp_aux **drm_aux) { + struct device *dev = &edp->pdev->dev; struct edp_aux *aux = NULL; int ret; @@ -201,6 +201,7 @@ void *msm_edp_aux_init(struct device *dev, void __iomem *regbase, aux->drm_aux.name = "msm_edp_aux"; aux->drm_aux.dev = dev; + aux->drm_aux.drm_dev = edp->dev; aux->drm_aux.transfer = edp_aux_transfer; ret = drm_dp_aux_register(&aux->drm_aux); if (ret) { diff --git a/drivers/gpu/drm/msm/edp/edp_ctrl.c b/drivers/gpu/drm/msm/edp/edp_ctrl.c index 0d9657cc70db..57af3d8b6699 100644 --- a/drivers/gpu/drm/msm/edp/edp_ctrl.c +++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c @@ -1153,7 +1153,7 @@ int msm_edp_ctrl_init(struct msm_edp *edp) } /* Init aux and phy */ - ctrl->aux = msm_edp_aux_init(dev, ctrl->base, &ctrl->drm_aux); + ctrl->aux = msm_edp_aux_init(edp, ctrl->base, &ctrl->drm_aux); if (!ctrl->aux || !ctrl->drm_aux) { pr_err("%s:failed to init aux\n", __func__); return -ENOMEM; diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c index bfce762adcf0..d1b49508ecb9 100644 --- a/drivers/gpu/drm/nouveau/nouveau_connector.c +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c @@ -1355,6 +1355,7 @@ nouveau_connector_create(struct drm_device *dev, case DRM_MODE_CONNECTOR_DisplayPort: case DRM_MODE_CONNECTOR_eDP: nv_connector->aux.dev = connector->kdev; + nv_connector->aux.drm_dev = dev; nv_connector->aux.transfer = nouveau_connector_aux_xfer; snprintf(aux_name, sizeof(aux_name), "sor-%04x-%04x", dcbe->hasht, dcbe->hashm); diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index 15b00a347560..c50c504bad50 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -232,6 +232,7 @@ void radeon_dp_aux_init(struct radeon_connector *radeon_connector) radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd; radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev; + radeon_connector->ddc_bus->aux.drm_dev = radeon_connector->base.dev; if (ASIC_IS_DCE5(rdev)) { if (radeon_auxch) radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native; diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c index ea56c6ec25e4..7d7cc90b6fc9 100644 --- a/drivers/gpu/drm/tegra/dpaux.c +++ b/drivers/gpu/drm/tegra/dpaux.c @@ -719,6 +719,7 @@ int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output) unsigned long timeout; int err; + aux->drm_dev = output->connector.dev; err = drm_dp_aux_register(aux); if (err < 0) return err; diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c index 99158ee67d02..8272eee03adc 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -1069,6 +1069,7 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) dp->aux.name = "ZynqMP DP AUX"; dp->aux.dev = dp->dev; + dp->aux.drm_dev = dp->drm; dp->aux.transfer = zynqmp_dp_aux_transfer; return drm_dp_aux_register(&dp->aux); diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 5efa0d329b67..4abe0cea1302 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1838,6 +1838,8 @@ struct drm_dp_aux_cec { * @name: user-visible name of this AUX channel and the I2C-over-AUX adapter * @ddc: I2C adapter that can be used for I2C-over-AUX communication * @dev: pointer to struct device that is the parent for this AUX channel + * @drm_dev: pointer to the &drm_device that owns this AUX channel. Beware, this may be %NULL + * before drm_dp_aux_register() has been called. * @crtc: backpointer to the crtc that is currently using this AUX channel * @hw_mutex: internal mutex used for locking transfers * @crc_work: worker that captures CRCs for each frame @@ -1845,7 +1847,11 @@ struct drm_dp_aux_cec { * @transfer: transfers a message representing a single AUX transaction * * The @dev field should be set to a pointer to the device that implements the - * AUX channel. + * AUX channel. As well, the @drm_dev field should be set to the &drm_device + * that will be using this AUX channel as early as possible. For many graphics + * drivers this should happen before drm_dp_aux_init(), however it's perfectly + * fine to set this field later so long as it's assigned before calling + * drm_dp_aux_register(). * * The @name field may be used to specify the name of the I2C adapter. If set to * %NULL, dev_name() of @dev will be used. @@ -1877,6 +1883,7 @@ struct drm_dp_aux { const char *name; struct i2c_adapter ddc; struct device *dev; + struct drm_device *drm_dev; struct drm_crtc *crtc; struct mutex hw_mutex; struct work_struct crc_work; -- 2.30.2