From patchwork Tue Oct 26 21:56:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philip Chen X-Patchwork-Id: 12585733 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC7D0C433F5 for ; Tue, 26 Oct 2021 21:57:03 +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 804AB60FE8 for ; Tue, 26 Oct 2021 21:57:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 804AB60FE8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org 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 D5E1989E52; Tue, 26 Oct 2021 21:57:00 +0000 (UTC) Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by gabe.freedesktop.org (Postfix) with ESMTPS id DA4CF89D6C for ; Tue, 26 Oct 2021 21:56:55 +0000 (UTC) Received: by mail-pl1-x636.google.com with SMTP id z11so522397plg.8 for ; Tue, 26 Oct 2021 14:56:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=9F+EWbh01K9eqvh7QO6VrhctGso+L9ps7sX+i8thX2Y=; b=Zdc4ztOZkl8MtmXXDulYtc8GEdI8IyMPqz3rieEXFQnL2Lqi1V7RuMN7H7cBLLh/WM /MIdKBeNWbepPud2CCiph86WRpuM3I7XKcdT+TO34XWvl8qHH7qYkb7bMs3S+fds2i43 aGu4iuDM+PHXHHNwIcrFMr7ZDDW4/ailCSjR8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=9F+EWbh01K9eqvh7QO6VrhctGso+L9ps7sX+i8thX2Y=; b=vU33h0ayGrwTnT4KwhW2Mt1giR4cDWSw8y0tQ1zESe/QGcWgNK/nRMZ34Fyo49mYbw RpitCB8UjcE83oVf19CmODkeIP3ujyThkKAC3MKs4XHZMtSrngFwU+mshDq6rG0hQyo3 0uraQ1h2iVLllA4qhD5SpFwXPJEc/4SRh6HRy1UAhiMlBEIeLjdVwDAJ0V9BHDJLdHbs KGMGLNX9xNARbqZIH3bNQ9K60uCbJSjRDBHopOuaflmawh2beUxXhYqblTUqCWrcimtf cat0nwA2zhSB7lEQotb4C4KoGhyOPd5Pnisanqp7V57s3OSc9Od2K31Uh+AvbPg92nJW OYzA== X-Gm-Message-State: AOAM533Jdy7UG0+Zv1xQlDifVUZVDnw04Ktj4rcunlHaRo+M04I4fq9L TYkYIPjAg5nGgf3Vws7n4/yUTqTx490EJQ== X-Google-Smtp-Source: ABdhPJzf1EEFbnTBWOPKTGgp7zivHRUhUNIS7IywoMnYJmw7DzXLac4ndmz27S1IJS0Os/VTjullCA== X-Received: by 2002:a17:90b:198b:: with SMTP id mv11mr1503430pjb.235.1635285415549; Tue, 26 Oct 2021 14:56:55 -0700 (PDT) Received: from philipchen.mtv.corp.google.com ([2620:15c:202:201:dad:6684:6674:b268]) by smtp.gmail.com with ESMTPSA id t8sm21225953pgk.66.2021.10.26.14.56.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Oct 2021 14:56:55 -0700 (PDT) From: Philip Chen To: LKML Cc: swboyd@chromium.org, dianders@chromium.org, Philip Chen , Andrzej Hajda , Daniel Vetter , David Airlie , Jernej Skrabec , Jonas Karlman , Laurent Pinchart , Neil Armstrong , Robert Foss , dri-devel@lists.freedesktop.org Subject: [PATCH v4 2/2] drm/bridge: parade-ps8640: Populate devices on aux-bus Date: Tue, 26 Oct 2021 14:56:49 -0700 Message-Id: <20211026145622.v4.2.I09899dea340f11feab97d719cb4b62bef3179e4b@changeid> X-Mailer: git-send-email 2.33.0.1079.g6e70778dc9-goog In-Reply-To: <20211026145622.v4.1.I9d81c3b44f350707b5373d00524af77c4aae862b@changeid> References: <20211026145622.v4.1.I9d81c3b44f350707b5373d00524af77c4aae862b@changeid> 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Conventionally, panel is listed under the root of the device tree. When userland asks for display mode, ps8640 bridge is responsible for returning EDID when ps8640_bridge_get_edid() is called. Now enable a new option of listing panel under "aux-bus" of ps8640 bridge node in the device tree. In this case, panel driver can retrieve EDID by triggering AUX transactions, without ps8640_bridge_get_edid() calls at all. To prevent the "old" and "new" options from interfering with each other's logic flow, disable DRM_BRIDGE_OP_EDID when the new option is taken. Signed-off-by: Philip Chen Reviewed-by: Stephen Boyd Reviewed-by: Douglas Anderson --- (no changes since v3) Changes in v3: - Fix when to call of_node_put() in ps8640_of_panel_on_aux_bus() Changes in v2: - Add of_node_put() calls in ps8640_of_panel_on_aux_bus() - Select DRM_DP_AUX_BUS for PS8640 driver in Kconfig - Replace _put_sync() with _put_sync_suspend() in ps8640_post_disable() drivers/gpu/drm/bridge/Kconfig | 1 + drivers/gpu/drm/bridge/parade-ps8640.c | 51 ++++++++++++++++++++------ 2 files changed, 40 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 431b6e12a81f..61db5a66b493 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -182,6 +182,7 @@ config DRM_PARADE_PS8622 config DRM_PARADE_PS8640 tristate "Parade PS8640 MIPI DSI to eDP Converter" depends on OF + select DRM_DP_AUX_BUS select DRM_KMS_HELPER select DRM_MIPI_DSI select DRM_PANEL diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c index cf1f630a3958..e737f1a27f30 100644 --- a/drivers/gpu/drm/bridge/parade-ps8640.c +++ b/drivers/gpu/drm/bridge/parade-ps8640.c @@ -14,6 +14,7 @@ #include #include +#include #include #include #include @@ -149,6 +150,23 @@ static inline struct ps8640 *aux_to_ps8640(struct drm_dp_aux *aux) return container_of(aux, struct ps8640, aux); } +static bool ps8640_of_panel_on_aux_bus(struct device *dev) +{ + struct device_node *bus, *panel; + + bus = of_get_child_by_name(dev->of_node, "aux-bus"); + if (!bus) + return false; + + panel = of_get_child_by_name(bus, "panel"); + of_node_put(bus); + if (!panel) + return false; + of_node_put(panel); + + return true; +} + static int ps8640_ensure_hpd(struct ps8640 *ps_bridge) { struct regmap *map = ps_bridge->regmap[PAGE2_TOP_CNTL]; @@ -556,17 +574,6 @@ static int ps8640_probe(struct i2c_client *client) if (!ps_bridge) return -ENOMEM; - /* port@1 is ps8640 output port */ - ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL); - if (ret < 0) - return ret; - if (!panel) - return -ENODEV; - - ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel); - if (IS_ERR(ps_bridge->panel_bridge)) - return PTR_ERR(ps_bridge->panel_bridge); - ps_bridge->supplies[0].supply = "vdd33"; ps_bridge->supplies[1].supply = "vdd12"; ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies), @@ -589,9 +596,16 @@ static int ps8640_probe(struct i2c_client *client) ps_bridge->bridge.funcs = &ps8640_bridge_funcs; ps_bridge->bridge.of_node = dev->of_node; - ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID; ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP; + /* + * In the device tree, if panel is listed under aux-bus of the bridge + * node, panel driver should be able to retrieve EDID by itself using + * aux-bus. So let's not set DRM_BRIDGE_OP_EDID here. + */ + if (!ps8640_of_panel_on_aux_bus(&client->dev)) + ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID; + ps_bridge->page[PAGE0_DP_CNTL] = client; ps_bridge->regmap[PAGE0_DP_CNTL] = devm_regmap_init_i2c(client, ps8640_regmap_config); @@ -630,6 +644,19 @@ static int ps8640_probe(struct i2c_client *client) if (ret) return ret; + devm_of_dp_aux_populate_ep_devices(&ps_bridge->aux); + + /* port@1 is ps8640 output port */ + ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL); + if (ret < 0) + return ret; + if (!panel) + return -ENODEV; + + ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel); + if (IS_ERR(ps_bridge->panel_bridge)) + return PTR_ERR(ps_bridge->panel_bridge); + drm_bridge_add(&ps_bridge->bridge); return 0;