From patchwork Tue Jan 3 19:07:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Morgan X-Patchwork-Id: 13087910 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id D0A8EC3DA7D for ; Tue, 3 Jan 2023 19:07:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D974510E4BF; Tue, 3 Jan 2023 19:07:18 +0000 (UTC) Received: from mail-oa1-x35.google.com (mail-oa1-x35.google.com [IPv6:2001:4860:4864:20::35]) by gabe.freedesktop.org (Postfix) with ESMTPS id C549110E4BA for ; Tue, 3 Jan 2023 19:07:13 +0000 (UTC) Received: by mail-oa1-x35.google.com with SMTP id 586e51a60fabf-1433ef3b61fso37836520fac.10 for ; Tue, 03 Jan 2023 11:07:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; 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=e9FxC5u9raEA62gzOJDTTKSpPWLmB1RuNw13AoTsjYs=; b=BaX2cjvuLHWA357xx30duyZwG+ju4OdXVQ3+B7csHL8Dx4Kb1lkU3hVgOUUMa9n88n dBfTkp0mPgRJMqvKp3FcIns11EbjFafZFvrp9cmqVHUYGJBe/mkGQVb7W0gytdEm9G7M LPrQP9mHDRvSJ6vciFkHHSUgssNV9I3C0pR9ygEiCCG7ODzHKLgZIq22JnpJNzfbUiiy RZrgPoO6AUQ5JB8V+CfjVlHWKyC59X/YOXuTe4moyGld64EP5lORjXdHAzU2B5Iyd96S uxwZC4S+aaJt93gwi0Bq8ZUqg1sioX62p0fDb4tlHKlzIuOZttY7UoJPdBomm56sV/KX uFCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=e9FxC5u9raEA62gzOJDTTKSpPWLmB1RuNw13AoTsjYs=; b=NfFZVimWX5Isp37CU7eLpnDJtd98xXnN6DGqPznFlH8ZXaRltUiTY7FOYk3N3ruBVB xvYG+NHOjnC0oQFW0TE2o9KMZVJUI1GtI+hs6ghsNrFUcKruHoOtCzRt+Fqcxox53FJF EnXuQHNhi3XvFBHoveaqWHDjvJqqIyixMBnalvnpZbOS/W0Yg0twp37Eg2oTjX+X2p43 BwzTNNoh/+i2Y6XPkFjh0Peyhoo9LIw3vJEZE0Jhit0yqg2SHrTsyYeCmKdE28+huPZL myVSPNDGapX24TSuGS/3GGBFQ8JwTPfmUHpfQdzON4On6dfa/SOPg2UoUK34yQJw1aro yZPQ== X-Gm-Message-State: AFqh2kqYY5qLypRaocTFutm1hLfocukeRTQn7P+XOucxu80Rpv1u7Xee JxhEpCV8x3B8oAt28VGtyKhHQiWIuGE= X-Google-Smtp-Source: AMrXdXvOHS4LTp18Y1bsii95tobv24huefOurEgedYORrVi88OlhQoRYHmz7podkKPmWnG7yFUIkHA== X-Received: by 2002:a05:6870:c989:b0:150:8834:f644 with SMTP id hi9-20020a056870c98900b001508834f644mr6744260oab.57.1672772832791; Tue, 03 Jan 2023 11:07:12 -0800 (PST) Received: from localhost.localdomain ([76.244.6.13]) by smtp.gmail.com with ESMTPSA id s24-20020a056870ea9800b0014c7958c55bsm14752207oap.42.2023.01.03.11.07.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Jan 2023 11:07:12 -0800 (PST) From: Chris Morgan To: dri-devel@lists.freedesktop.org Subject: [PATCH V7 1/4] drm: of: Add drm_of_get_dsi_bus helper function Date: Tue, 3 Jan 2023 13:07:04 -0600 Message-Id: <20230103190707.104595-2-macroalpha82@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230103190707.104595-1-macroalpha82@gmail.com> References: <20230103190707.104595-1-macroalpha82@gmail.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Chris Morgan , krzysztof.kozlowski+dt@linaro.org, sam@ravnborg.org, linux-rockchip@lists.infradead.org, robh+dt@kernel.org, thierry.reding@gmail.com, tzimmermann@suse.de, maccraft123mc@gmail.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Chris Morgan Add helper function to find DSI host for devices where DSI panel is not a minor of a DSI bus (such as the Samsung AMS495QA01 panel or the official Raspberry Pi touchscreen display). Signed-off-by: Chris Morgan Signed-off-by: Maya Matuszczyk Reviewed-by: Linus Walleij Reviewed-by: Sam Ravnborg --- drivers/gpu/drm/drm_of.c | 62 ++++++++++++++++++++++++++++++++++++++++ include/drm/drm_of.h | 11 +++++++ 2 files changed, 73 insertions(+) diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index 7bbcb999bb75..7d89ac164069 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -493,3 +494,64 @@ int drm_of_get_data_lanes_count_ep(const struct device_node *port, return ret; } EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_ep); + +/** + * drm_of_get_dsi_bus - find the DSI bus for a given device + * @dev: parent device of display (SPI, I2C) + * @dsi_host: DSI host to be populated + * @info: DSI device info to be updated with correct DSI node + * + * Given a panel device parented to a non-DSI device, follow the + * devicetree to find the correct DSI host node and populate the + * dsi_host with the correct host and info with the correct node. + * Returns zero if successful, -EPROBE_DEFER if the DSI host is + * found but not available, or -ENODEV otherwise. + */ +int drm_of_get_dsi_bus(struct device *dev, + struct mipi_dsi_host **dsi_host, + struct mipi_dsi_device_info *info) +{ + struct device_node *endpoint, *dsi_host_node; + + /* + * Get first endpoint child from device. + */ + endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); + if (!endpoint) + return -ENODEV; + + /* + * Follow the first endpoint to get the DSI host node. + */ + dsi_host_node = of_graph_get_remote_port_parent(endpoint); + if (!dsi_host_node) + goto error; + + /* + * Get the DSI host from the DSI host node. If we get an error + * or the return is null assume we're not ready to probe just + * yet. Release the DSI host node since we're done with it. + */ + *dsi_host = of_find_mipi_dsi_host_by_node(dsi_host_node); + of_node_put(dsi_host_node); + if (IS_ERR_OR_NULL(*dsi_host)) { + of_node_put(endpoint); + return -EPROBE_DEFER; + } + + /* + * Set the node of the mipi_dsi_device_info to the correct node + * and then release the endpoint node since we're done with it. + */ + info->node = of_graph_get_remote_port(endpoint); + if (IS_ERR_OR_NULL(info->node)) + goto error; + + of_node_put(endpoint); + return 0; + +error: + of_node_put(endpoint); + return -ENODEV; +} +EXPORT_SYMBOL_GPL(drm_of_get_dsi_bus); diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h index 10ab58c40746..e27061b02315 100644 --- a/include/drm/drm_of.h +++ b/include/drm/drm_of.h @@ -15,6 +15,8 @@ struct drm_encoder; struct drm_panel; struct drm_bridge; struct device_node; +struct mipi_dsi_device_info; +struct mipi_dsi_host; /** * enum drm_lvds_dual_link_pixels - Pixel order of an LVDS dual-link connection @@ -56,6 +58,9 @@ int drm_of_get_data_lanes_count_ep(const struct device_node *port, int port_reg, int reg, const unsigned int min, const unsigned int max); +int drm_of_get_dsi_bus(struct device *dev, + struct mipi_dsi_host **dsi_host, + struct mipi_dsi_device_info *info); #else static inline uint32_t drm_of_crtc_port_mask(struct drm_device *dev, struct device_node *port) @@ -127,6 +132,12 @@ drm_of_get_data_lanes_count_ep(const struct device_node *port, { return -EINVAL; } +static int drm_of_get_dsi_bus(struct device *dev, + struct mipi_dsi_host **dsi_host, + struct mipi_dsi_device_info *info) +{ + return -EINVAL; +} #endif /*