From patchwork Fri Sep 11 13:54:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Tretter X-Patchwork-Id: 257213 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 AC3B1C433E2 for ; Fri, 11 Sep 2020 16:48:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 52261221ED for ; Fri, 11 Sep 2020 16:48:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726312AbgIKQsE (ORCPT ); Fri, 11 Sep 2020 12:48:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726374AbgIKPID (ORCPT ); Fri, 11 Sep 2020 11:08:03 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1D057C061386 for ; Fri, 11 Sep 2020 06:54:27 -0700 (PDT) Received: from [2a0a:edc0:0:1101:1d::39] (helo=dude03.red.stw.pengutronix.de) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kGjVK-0007wX-4H; Fri, 11 Sep 2020 15:54:20 +0200 Received: from mtr by dude03.red.stw.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1kGjVH-00FKnq-Nx; Fri, 11 Sep 2020 15:54:15 +0200 From: Michael Tretter To: dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org Cc: kernel@pengutronix.de, Laurent.pinchart@ideasonboard.com, krzk@kernel.org, narmstrong@baylibre.com, b.zolnierkie@samsung.com, sylvester.nawrocki@gmail.com, a.hajda@samsung.com, inki.dae@samsung.com, jy0922.shim@samsung.com, sw0312.kim@samsung.com, Michael Tretter Date: Fri, 11 Sep 2020 15:54:07 +0200 Message-Id: <20200911135413.3654800-11-m.tretter@pengutronix.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200911135413.3654800-1-m.tretter@pengutronix.de> References: <20200911135413.3654800-1-m.tretter@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:1101:1d::39 X-SA-Exim-Mail-From: mtr@pengutronix.de Subject: [PATCH v2 10/16] drm/exynos: implement a drm bridge X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) X-PTX-Original-Recipient: linux-samsung-soc@vger.kernel.org Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Make the exynos_dsi driver a full drm bridge that can be found and used from other drivers. Other drivers can only attach to the bridge, if a mipi dsi device already attached to the bridge. This allows to defer the probe of the display pipe until the downstream bridges are available, too. Signed-off-by: Michael Tretter --- v2: - move attach of out_bridge to bridge_attach - add bridge_detach - don't cleanup encoder if create_connector failed --- drivers/gpu/drm/exynos/exynos_drm_dsi.c | 103 +++++++++++++++++------- 1 file changed, 75 insertions(+), 28 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c index 2d75f9877dc0..5e7c1a99a3ee 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c @@ -266,6 +266,7 @@ struct exynos_dsi_driver_data { struct exynos_dsi { struct drm_encoder encoder; + struct drm_bridge bridge; struct mipi_dsi_host dsi_host; struct drm_connector connector; struct drm_panel *panel; @@ -1602,6 +1603,60 @@ static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = { .disable = exynos_dsi_disable, }; +static int exynos_dsi_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct exynos_dsi *dsi = bridge->driver_private; + struct drm_encoder *encoder = bridge->encoder; + int ret; + + if (!dsi->out_bridge && !dsi->panel) + return -EPROBE_DEFER; + + if (dsi->out_bridge) { + ret = drm_bridge_attach(encoder, dsi->out_bridge, + bridge, flags); + if (ret) + return ret; + list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain); + } else { + ret = exynos_dsi_create_connector(encoder); + if (ret) + return ret; + + if (dsi->panel) { + dsi->connector.status = connector_status_connected; + } + } + + return 0; +} + +static void exynos_dsi_bridge_detach(struct drm_bridge *bridge) +{ + struct exynos_dsi *dsi = bridge->driver_private; + struct drm_encoder *encoder = bridge->encoder; + struct drm_device *drm = encoder->dev; + + if (dsi->panel) { + mutex_lock(&drm->mode_config.mutex); + exynos_dsi_disable(&dsi->encoder); + dsi->panel = NULL; + dsi->connector.status = connector_status_disconnected; + mutex_unlock(&drm->mode_config.mutex); + } else { + if (dsi->out_bridge->funcs->detach) + dsi->out_bridge->funcs->detach(dsi->out_bridge); + dsi->out_bridge = NULL; + INIT_LIST_HEAD(&dsi->bridge_chain); + } +} + +static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = { + .attach = exynos_dsi_bridge_attach, + .detach = exynos_dsi_bridge_detach, +}; + MODULE_DEVICE_TABLE(of, exynos_dsi_of_match); static int exynos_dsi_host_attach(struct mipi_dsi_host *host, @@ -1609,25 +1664,12 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host, { struct exynos_dsi *dsi = host_to_dsi(host); const struct exynos_dsi_host_ops *ops = dsi->driver_data->host_ops; - struct drm_encoder *encoder = &dsi->encoder; struct drm_bridge *out_bridge; - out_bridge = of_drm_find_bridge(device->dev.of_node); + out_bridge = of_drm_find_bridge(device->dev.of_node); if (out_bridge) { - drm_bridge_attach(encoder, out_bridge, NULL, 0); dsi->out_bridge = out_bridge; - list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain); } else { - int ret = exynos_dsi_create_connector(encoder); - - if (ret) { - DRM_DEV_ERROR(dsi->dev, - "failed to create connector ret = %d\n", - ret); - drm_encoder_cleanup(encoder); - return ret; - } - dsi->panel = of_drm_find_panel(device->dev.of_node); if (IS_ERR(dsi->panel)) dsi->panel = NULL; @@ -1662,20 +1704,6 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host, { struct exynos_dsi *dsi = host_to_dsi(host); const struct exynos_dsi_host_ops *ops = dsi->driver_data->host_ops; - struct drm_device *drm = dsi->encoder.dev; - - if (dsi->panel) { - mutex_lock(&drm->mode_config.mutex); - exynos_dsi_disable(&dsi->encoder); - dsi->panel = NULL; - dsi->connector.status = connector_status_disconnected; - mutex_unlock(&drm->mode_config.mutex); - } else { - if (dsi->out_bridge->funcs->detach) - dsi->out_bridge->funcs->detach(dsi->out_bridge); - dsi->out_bridge = NULL; - INIT_LIST_HEAD(&dsi->bridge_chain); - } if (ops && ops->detach) ops->detach(dsi->dsi_host.dev, device); @@ -1786,7 +1814,15 @@ static int exynos_dsi_bind(struct device *dev, struct device *master, of_node_put(in_bridge_node); } + ret = drm_bridge_attach(encoder, &dsi->bridge, in_bridge, 0); + if (ret) + goto err; + return 0; + +err: + drm_encoder_cleanup(encoder); + return ret; } static void exynos_dsi_unbind(struct device *dev, struct device *master, @@ -1796,6 +1832,8 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master, struct drm_encoder *encoder = &dsi->encoder; exynos_dsi_disable(encoder); + + drm_encoder_cleanup(encoder); } static const struct component_ops exynos_dsi_component_ops = { @@ -1806,6 +1844,7 @@ static const struct component_ops exynos_dsi_component_ops = { static struct exynos_dsi *__exynos_dsi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct drm_bridge *bridge; struct resource *res; struct exynos_dsi *dsi; int ret, i; @@ -1894,11 +1933,19 @@ static struct exynos_dsi *__exynos_dsi_probe(struct platform_device *pdev) if (ret) return ERR_PTR(ret); + bridge = &dsi->bridge; + bridge->driver_private = dsi; + bridge->funcs = &exynos_dsi_bridge_funcs; + bridge->of_node = dev->of_node; + drm_bridge_add(bridge); + return dsi; } static void __exynos_dsi_remove(struct exynos_dsi *dsi) { + drm_bridge_remove(&dsi->bridge); + mipi_dsi_host_unregister(&dsi->dsi_host); }