From patchwork Sat Jul 29 20:43:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 708268 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8A29C04E69 for ; Sat, 29 Jul 2023 20:43:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229590AbjG2UnQ (ORCPT ); Sat, 29 Jul 2023 16:43:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229476AbjG2UnP (ORCPT ); Sat, 29 Jul 2023 16:43:15 -0400 Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com [IPv6:2a00:1450:4864:20::234]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7C675134 for ; Sat, 29 Jul 2023 13:43:12 -0700 (PDT) Received: by mail-lj1-x234.google.com with SMTP id 38308e7fff4ca-2b9d3dacb33so21878531fa.1 for ; Sat, 29 Jul 2023 13:43:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1690663391; x=1691268191; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=U/YZjWg1R9arEN9ypp/0l3RecOR58lD3hWJ7WN/3lyc=; b=gBIkx0tuok2sAPIxBPJmnCfbVFwNt7BHTw6k4lRJIPPmBxgFeO43EEdxSjSx7o3rtH G1NlHncWY+cS/mr+xEmx0Yg0MYmFkwutW67xYKg2NJ5vfAO0tIm+5Pv5sZsSVVfrfQYr HEJCZYcXKA+uWMxpUzGmx5hcBMJnTtgn7rpI/nTxty38BOcpuPhQeaE1V6QjoHXvDGaH GjHN6705Rc51qY2rhkl5LRzaD/UFzUCHaHLppM3MM/FqKLTFO9tNlHwClrQ3WFN69VxG NCE8sZIouJcuGywm9ZN2/OnSn3GYgMYQPdrbT8P1md3qwPv3nRkHxj+s/RUt730hMTZz SUyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690663391; x=1691268191; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=U/YZjWg1R9arEN9ypp/0l3RecOR58lD3hWJ7WN/3lyc=; b=inFIqai2XKvfHdRA2/ikYxtC2MyK4ePPZ3KespcSTlE90QOTdEQDdnco21N9aiGTX7 LEaVZe3SDaaotRH0ZPSh6qJQeUKLYWC/gQp9Jbdp2Cg8mA+Qz6iraQzJKCgTgUAW+RLF rv4hD07+R6XDkGCOp4+y+w+3hKV2UU6qHotW40Sbl1yhgShccsQs4nx9fjfRCz0JUV99 UWtFazNLG9pJS268vCaktwoloVN1CtQ72V8nYj0r/FC0PX36fvRG1uaDjeCjgRm+L0Ne iJ2PNW26Yg01NGXTlCHMr2iwnddMCe5EvLJBljl4FnWCMTvXWoYryWPjysX5BO8FtZct yjww== X-Gm-Message-State: ABy/qLYircTLfvLIpMjs0AagQzr2382EjzeKQfIFQvOERCXXwPpyfbau sff5fOAeMs5FFHAxBE7Nrlp0LQ== X-Google-Smtp-Source: APBJJlFK7gY/sFSMd1/+P41qYJ3o2NJOgs/xEXugQBglityJcwO/D/Kub70UidEszVGV2f4QRu2gog== X-Received: by 2002:a2e:2e17:0:b0:2b6:9f1e:12bf with SMTP id u23-20020a2e2e17000000b002b69f1e12bfmr4342320lju.1.1690663390546; Sat, 29 Jul 2023 13:43:10 -0700 (PDT) Received: from umbar.unikie.fi ([192.130.178.91]) by smtp.gmail.com with ESMTPSA id v20-20020a2e9614000000b002b9af8422a8sm1705177ljh.130.2023.07.29.13.43.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 29 Jul 2023 13:43:09 -0700 (PDT) From: Dmitry Baryshkov To: David Airlie , Daniel Vetter , Andy Gross , Bjorn Andersson , Konrad Dybcio , Vinod Koul , Kishon Vijay Abraham I , Heikki Krogerus , Greg Kroah-Hartman , Neil Armstrong Cc: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-usb@vger.kernel.org Subject: [PATCH 1/3] drm/display: add transparent bridge helper Date: Sat, 29 Jul 2023 23:43:05 +0300 Message-Id: <20230729204307.268587-2-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230729204307.268587-1-dmitry.baryshkov@linaro.org> References: <20230729204307.268587-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Define a helper for creating simple transparent bridges which serve the only purpose of linking devices into the bridge chain up to the last bridge representing the connector. This is especially useful for DP/USB-C bridge chains, which can span across several devices, but do not require any additional functionality from the intermediate bridges. Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/display/Kconfig | 9 ++ drivers/gpu/drm/display/Makefile | 2 + drivers/gpu/drm/display/drm_simple_bridge.c | 120 ++++++++++++++++++++ include/drm/display/drm_simple_bridge.h | 19 ++++ 4 files changed, 150 insertions(+) create mode 100644 drivers/gpu/drm/display/drm_simple_bridge.c create mode 100644 include/drm/display/drm_simple_bridge.h diff --git a/drivers/gpu/drm/display/Kconfig b/drivers/gpu/drm/display/Kconfig index 09712b88a5b8..a6132984b9e3 100644 --- a/drivers/gpu/drm/display/Kconfig +++ b/drivers/gpu/drm/display/Kconfig @@ -49,3 +49,12 @@ config DRM_DP_CEC Note: not all adapters support this feature, and even for those that do support this they often do not hook up the CEC pin. + +config DRM_SIMPLE_BRIDGE + tristate + depends on DRM + select AUXILIARY_BUS + select DRM_PANEL_BRIDGE + help + Simple transparent bridge that is used by several drivers to build + bridges chain. diff --git a/drivers/gpu/drm/display/Makefile b/drivers/gpu/drm/display/Makefile index 17ac4a1006a8..6e2b0d7f24b3 100644 --- a/drivers/gpu/drm/display/Makefile +++ b/drivers/gpu/drm/display/Makefile @@ -16,3 +16,5 @@ drm_display_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o drm_display_helper-$(CONFIG_DRM_DP_CEC) += drm_dp_cec.o obj-$(CONFIG_DRM_DISPLAY_HELPER) += drm_display_helper.o + +obj-$(CONFIG_DRM_SIMPLE_BRIDGE) += drm_simple_bridge.o diff --git a/drivers/gpu/drm/display/drm_simple_bridge.c b/drivers/gpu/drm/display/drm_simple_bridge.c new file mode 100644 index 000000000000..c9966691efb1 --- /dev/null +++ b/drivers/gpu/drm/display/drm_simple_bridge.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2023 Linaro Ltd. + * + * Author: Dmitry Baryshkov + */ +#include +#include + +#include +#include + +static DEFINE_IDA(simple_bridge_ida); + +static void drm_simple_bridge_release(struct device *dev) +{ + struct auxiliary_device *adev = to_auxiliary_dev(dev); + + kfree(adev); +} + +static void drm_simple_bridge_unregister_adev(void *_adev) +{ + struct auxiliary_device *adev = _adev; + + auxiliary_device_delete(adev); + auxiliary_device_uninit(adev); +} + +int drm_simple_bridge_register(struct device *parent) +{ + struct auxiliary_device *adev; + int ret; + + adev = kzalloc(sizeof(*adev), GFP_KERNEL); + if (!adev) + return -ENOMEM; + + ret = ida_alloc(&simple_bridge_ida, GFP_KERNEL); + if (ret < 0) + return ret; + + adev->id = ret; + adev->name = "simple_bridge"; + adev->dev.parent = parent; + adev->dev.of_node = parent->of_node; + adev->dev.release = drm_simple_bridge_release; + + ret = auxiliary_device_init(adev); + if (ret) { + kfree(adev); + return ret; + } + + ret = auxiliary_device_add(adev); + if (ret) { + auxiliary_device_uninit(adev); + return ret; + } + + return devm_add_action_or_reset(parent, drm_simple_bridge_unregister_adev, adev); +} + +struct drm_simple_bridge_data { + struct drm_bridge bridge; + struct drm_bridge *next_bridge; + struct device *dev; +}; + +static int drm_simple_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct drm_simple_bridge_data *data; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) + return -EINVAL; + + data = container_of(bridge, struct drm_simple_bridge_data, bridge); + + return drm_bridge_attach(bridge->encoder, data->next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); +} + +static const struct drm_bridge_funcs drm_simple_bridge_funcs = { + .attach = drm_simple_bridge_attach, +}; + +static int drm_simple_bridge_probe(struct auxiliary_device *auxdev, + const struct auxiliary_device_id *id) +{ + struct drm_simple_bridge_data *data; + + data = devm_kzalloc(&auxdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->dev = &auxdev->dev; + data->next_bridge = devm_drm_of_get_bridge(&auxdev->dev, auxdev->dev.of_node, 0, 0); + if (IS_ERR(data->next_bridge)) + return dev_err_probe(&auxdev->dev, PTR_ERR(data->next_bridge), + "failed to acquire drm_bridge\n"); + + data->bridge.funcs = &drm_simple_bridge_funcs; + data->bridge.of_node = data->dev->of_node; + + return devm_drm_bridge_add(data->dev, &data->bridge); +} + +static const struct auxiliary_device_id drm_simple_bridge_table[] = { + { .name = KBUILD_MODNAME ".simple_bridge" }, + {}, +}; +MODULE_DEVICE_TABLE(auxiliary, drm_simple_bridge_table); + +struct auxiliary_driver drm_simple_bridge_drv = { + .name = "simple_bridge", + .id_table = drm_simple_bridge_table, + .probe = drm_simple_bridge_probe, +}; +module_auxiliary_driver(drm_simple_bridge_drv); diff --git a/include/drm/display/drm_simple_bridge.h b/include/drm/display/drm_simple_bridge.h new file mode 100644 index 000000000000..3da8e1fb1137 --- /dev/null +++ b/include/drm/display/drm_simple_bridge.h @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2023 Linaro Ltd. + * + * Author: Dmitry Baryshkov + */ +#ifndef DRM_SIMPLE_BRIDGE_H +#define DRM_SIMPLE_BRIDGE_H + +#if IS_ENABLED(CONFIG_DRM_SIMPLE_BRIDGE) +int drm_simple_bridge_register(struct device *parent); +#else +static inline int drm_simple_bridge_register(struct device *parent) +{ + return 0; +} +#endif + +#endif From patchwork Sat Jul 29 20:43:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 708267 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3953DC04FDF for ; Sat, 29 Jul 2023 20:43:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229600AbjG2UnR (ORCPT ); Sat, 29 Jul 2023 16:43:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229572AbjG2UnP (ORCPT ); Sat, 29 Jul 2023 16:43:15 -0400 Received: from mail-lj1-x236.google.com (mail-lj1-x236.google.com [IPv6:2a00:1450:4864:20::236]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4734FE43 for ; 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Signed-off-by: Dmitry Baryshkov --- drivers/phy/qualcomm/Kconfig | 3 +- drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 44 ++--------------------- 2 files changed, 3 insertions(+), 44 deletions(-) diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig index ced603806375..fd8584d5dec8 100644 --- a/drivers/phy/qualcomm/Kconfig +++ b/drivers/phy/qualcomm/Kconfig @@ -60,10 +60,9 @@ config PHY_QCOM_QMP_COMBO tristate "Qualcomm QMP Combo PHY Driver" default PHY_QCOM_QMP depends on TYPEC || TYPEC=n - depends on DRM || DRM=n select GENERIC_PHY select MFD_SYSCON - select DRM_PANEL_BRIDGE if DRM + select DRM_SIMPLE_BRIDGE if DRM help Enable this to support the QMP Combo PHY transceiver that is used with USB3 and DisplayPort controllers on Qualcomm chips. diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c index 1793d49bf45c..4bf64899cc71 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c @@ -21,7 +21,7 @@ #include #include -#include +#include #include @@ -1419,8 +1419,6 @@ struct qmp_combo { struct clk_hw dp_link_hw; struct clk_hw dp_pixel_hw; - struct drm_bridge bridge; - struct typec_switch_dev *sw; enum typec_orientation orientation; }; @@ -3193,44 +3191,6 @@ static int qmp_combo_typec_switch_register(struct qmp_combo *qmp) } #endif -#if IS_ENABLED(CONFIG_DRM) -static int qmp_combo_bridge_attach(struct drm_bridge *bridge, - enum drm_bridge_attach_flags flags) -{ - struct qmp_combo *qmp = container_of(bridge, struct qmp_combo, bridge); - struct drm_bridge *next_bridge; - - if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) - return -EINVAL; - - next_bridge = devm_drm_of_get_bridge(qmp->dev, qmp->dev->of_node, 0, 0); - if (IS_ERR(next_bridge)) { - dev_err(qmp->dev, "failed to acquire drm_bridge: %pe\n", next_bridge); - return PTR_ERR(next_bridge); - } - - return drm_bridge_attach(bridge->encoder, next_bridge, bridge, - DRM_BRIDGE_ATTACH_NO_CONNECTOR); -} - -static const struct drm_bridge_funcs qmp_combo_bridge_funcs = { - .attach = qmp_combo_bridge_attach, -}; - -static int qmp_combo_dp_register_bridge(struct qmp_combo *qmp) -{ - qmp->bridge.funcs = &qmp_combo_bridge_funcs; - qmp->bridge.of_node = qmp->dev->of_node; - - return devm_drm_bridge_add(qmp->dev, &qmp->bridge); -} -#else -static int qmp_combo_dp_register_bridge(struct qmp_combo *qmp) -{ - return 0; -} -#endif - static int qmp_combo_parse_dt_lecacy_dp(struct qmp_combo *qmp, struct device_node *np) { struct device *dev = qmp->dev; @@ -3436,7 +3396,7 @@ static int qmp_combo_probe(struct platform_device *pdev) if (ret) return ret; - ret = qmp_combo_dp_register_bridge(qmp); + ret = drm_simple_bridge_register(dev); if (ret) return ret;