From patchwork Mon Nov 22 06:52:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagan Teki X-Patchwork-Id: 12693266 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C43B7C433EF for ; Mon, 22 Nov 2021 06:55:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=1o4M/zf39785nlwf2HpZLRiziq2rzs3/cKcA81eHSp0=; b=a84efDTAX3Zg9t j88Dg8Cdf+aLtRytMYS2lr1JUHQK2nqjB4aVSflcJBDYZQKg/4lT5gwas5mgd4oh3oJZJbn/YEDnm NxeMamkkH4/Z+lu9C0VTOsy59Yfho1G3W91wWk6fMORyPMEYV82ZM31b6JX16T40rQ+D2fndcrP8H 5lIA/iHzA+yIcXVmi8I0zknxSBMMXnGKPlwLy1p9lfJWB+fIyi7OA3jIN5cKYzv2bF7ZDRWGYlogZ 4+65JMQYwN8OK31njWuMjFOpCuBfDUN0Sdvi5TZ4oyP5xzS4i9i+oCK2IxWyOFz10UQJ5nXDx9TjC D+bQ3KnGg4ubT8N+Fmxw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mp3D5-00EzPJ-KB; Mon, 22 Nov 2021 06:53:51 +0000 Received: from mail-pj1-x102b.google.com ([2607:f8b0:4864:20::102b]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mp3Ck-00EzHN-Pv for linux-arm-kernel@lists.infradead.org; Mon, 22 Nov 2021 06:53:32 +0000 Received: by mail-pj1-x102b.google.com with SMTP id iq11so12990862pjb.3 for ; Sun, 21 Nov 2021 22:53:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amarulasolutions.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=CqcHDPI5j3BreTYZLwb22+vjVwocrgSYWGCGb32eVhw=; b=QPVgrYGL7PI722lud6ufHHXk8XVPHAANuzPawnzxM0KCf/QE52IvTk8L5ZYpM0KSRz itRLt+uivyK9N5BnfrNhn9B/iVlismf5YHAR4+uk/bUZaVz2uU2cCS8gxnIBT00Uufw3 4u7CUd7+UsesOgQLin+fXvlVt6kVw5WKLJflc= 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=CqcHDPI5j3BreTYZLwb22+vjVwocrgSYWGCGb32eVhw=; b=lcjHeV0Ef/koD1D+Rc5qO0UIO7HozgXejWrlRYYfGvjb8BFPrTTOr3x8Vv0gk3vVyi xj9C9j6/CuDbFT38Iq1PL5MqI/usSbOgsbDns00btIVikuj43lPm2pvowdeVBiRR6oAD WBd309qbn8hTRkpd/JMa8catDUIxlwJ+ukITSx6Fag1gne/XPE2t+QJaiMWjC2KRSCmL 5vEBH6+9SvpRklShuv+w0t9aVIRf5Y2LHuN263V9VIpb90fZT1ikyGQ/59mkaNm50IWC 2wuZr9WDfqMqVkIDzbxg/3PNt6J12pp/4joyRgae408Phqyf8kMTBLVMd/JaH2tzgWOD jfFw== X-Gm-Message-State: AOAM530yiyr0zRoyO6bmnZh/TphAUBWbZT7ylYCPdJSwyCW1bTqI6HNB K4c2SyXISfS1/xGjetPY1RQhvw== X-Google-Smtp-Source: ABdhPJzChYuIpTslj7ocMb+xUnf1Ejaew9r9ZSsFINiB4NIMgYqLG9RtizeXTUH/IXUJnLi6kUgyHw== X-Received: by 2002:a17:903:2091:b0:142:8567:e794 with SMTP id d17-20020a170903209100b001428567e794mr105544020plc.50.1637564009666; Sun, 21 Nov 2021 22:53:29 -0800 (PST) Received: from localhost.localdomain ([2405:201:c00a:a0a9:eed6:c913:819a:3850]) by smtp.gmail.com with ESMTPSA id a8sm7935904pfv.176.2021.11.21.22.53.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Nov 2021 22:53:29 -0800 (PST) From: Jagan Teki To: Maxime Ripard , Chen-Yu Tsai , Laurent Pinchart , Neil Armstrong , Robert Foss , Sam Ravnborg Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@googlegroups.com, linux-amarula@amarulasolutions.com, Jagan Teki Subject: [PATCH v5 2/7] drm: sun4i: dsi: Add component only once DSI device attached Date: Mon, 22 Nov 2021 12:22:18 +0530 Message-Id: <20211122065223.88059-3-jagan@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211122065223.88059-1-jagan@amarulasolutions.com> References: <20211122065223.88059-1-jagan@amarulasolutions.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211121_225330_882497_845C0259 X-CRM114-Status: GOOD ( 20.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Having component_add for running all drm bind callbacks returns error or unbound due to chain of DSI devices connected across bridge topology on a display pipeline. In a typical bridge oriented display pipeline where the host is connected to the bridge converter and that indeed connected to a panel. DRM => SUN6I DSI Host => Chipone ICN6211 => BananaPi Panel The bridge converter is looking for a panel to probe first and then attach the host. The host attach is looking for a bridge converter to probe and preserve bridge pointer, at this movement the host is trying to bind the all callbacks and one of the bind callback in the DSI host is trying to find the bridge using the bridge pointer in sun6i_dsi_attach call. chipone_probe().start drm_of_find_panel_or_bridge mipi_dsi_attach sun6i_dsi_attach drm_of_find_panel_or_bridge chipone_probe().done sun6i_dsi_probe().start mipi_dsi_host_register component_add sun6i_dsi_probe().done However, the movement when panel defers the probe, will make the bridge converter defer the host attach call which eventually found a NULL bridge pointer during DSI component bind callback. So, in order to prevent this scenario of binding invalid bridge, wait for DSI devices on the pipeline to probe first and start the binding process by moving component_add in host probe to attach call. chipone_probe().start drm_of_find_panel_or_bridge mipi_dsi_attach sun6i_dsi_attach drm_of_find_panel_or_bridge component_add chipone_probe().done sun6i_dsi_probe().start mipi_dsi_host_register sun6i_dsi_probe().done Signed-off-by: Jagan Teki --- Changes for v5: - new patch drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 119 +++++++++++++------------ 1 file changed, 60 insertions(+), 59 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 4bdcce8f1d84..43d9c9e5198d 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -959,11 +959,62 @@ static int sun6i_dsi_dcs_read(struct sun6i_dsi *dsi, return 1; } +static int sun6i_dsi_bind(struct device *dev, struct device *master, + void *data) +{ + struct drm_device *drm = data; + struct sun6i_dsi *dsi = dev_get_drvdata(dev); + int ret; + + drm_encoder_helper_add(&dsi->encoder, + &sun6i_dsi_enc_helper_funcs); + ret = drm_simple_encoder_init(drm, &dsi->encoder, + DRM_MODE_ENCODER_DSI); + if (ret) { + dev_err(dsi->dev, "Couldn't initialise the DSI encoder\n"); + return ret; + } + dsi->encoder.possible_crtcs = BIT(0); + + drm_connector_helper_add(&dsi->connector, + &sun6i_dsi_connector_helper_funcs); + ret = drm_connector_init(drm, &dsi->connector, + &sun6i_dsi_connector_funcs, + DRM_MODE_CONNECTOR_DSI); + if (ret) { + dev_err(dsi->dev, + "Couldn't initialise the DSI connector\n"); + goto err_cleanup_connector; + } + + drm_connector_attach_encoder(&dsi->connector, &dsi->encoder); + + return 0; + +err_cleanup_connector: + drm_encoder_cleanup(&dsi->encoder); + return ret; +} + +static void sun6i_dsi_unbind(struct device *dev, struct device *master, + void *data) +{ + struct sun6i_dsi *dsi = dev_get_drvdata(dev); + + drm_encoder_cleanup(&dsi->encoder); +} + +static const struct component_ops sun6i_dsi_ops = { + .bind = sun6i_dsi_bind, + .unbind = sun6i_dsi_unbind, +}; + static int sun6i_dsi_attach(struct mipi_dsi_host *host, struct mipi_dsi_device *device) { struct sun6i_dsi *dsi = host_to_sun6i_dsi(host); struct drm_panel *panel = of_drm_find_panel(device->dev.of_node); + int ret; if (IS_ERR(panel)) return PTR_ERR(panel); @@ -973,6 +1024,13 @@ static int sun6i_dsi_attach(struct mipi_dsi_host *host, dev_info(host->dev, "Attached device %s\n", device->name); + ret = component_add(dsi->dev, &sun6i_dsi_ops); + if (ret) { + dev_err(dsi->dev, "Couldn't register our component\n"); + mipi_dsi_host_unregister(&dsi->host); + return ret; + } + return 0; } @@ -984,6 +1042,8 @@ static int sun6i_dsi_detach(struct mipi_dsi_host *host, dsi->panel = NULL; dsi->device = NULL; + component_del(dsi->dev, &sun6i_dsi_ops); + return 0; } @@ -1041,56 +1101,6 @@ static const struct regmap_config sun6i_dsi_regmap_config = { .name = "mipi-dsi", }; -static int sun6i_dsi_bind(struct device *dev, struct device *master, - void *data) -{ - struct drm_device *drm = data; - struct sun6i_dsi *dsi = dev_get_drvdata(dev); - int ret; - - drm_encoder_helper_add(&dsi->encoder, - &sun6i_dsi_enc_helper_funcs); - ret = drm_simple_encoder_init(drm, &dsi->encoder, - DRM_MODE_ENCODER_DSI); - if (ret) { - dev_err(dsi->dev, "Couldn't initialise the DSI encoder\n"); - return ret; - } - dsi->encoder.possible_crtcs = BIT(0); - - drm_connector_helper_add(&dsi->connector, - &sun6i_dsi_connector_helper_funcs); - ret = drm_connector_init(drm, &dsi->connector, - &sun6i_dsi_connector_funcs, - DRM_MODE_CONNECTOR_DSI); - if (ret) { - dev_err(dsi->dev, - "Couldn't initialise the DSI connector\n"); - goto err_cleanup_connector; - } - - drm_connector_attach_encoder(&dsi->connector, &dsi->encoder); - - return 0; - -err_cleanup_connector: - drm_encoder_cleanup(&dsi->encoder); - return ret; -} - -static void sun6i_dsi_unbind(struct device *dev, struct device *master, - void *data) -{ - struct sun6i_dsi *dsi = dev_get_drvdata(dev); - - drm_encoder_cleanup(&dsi->encoder); -} - -static const struct component_ops sun6i_dsi_ops = { - .bind = sun6i_dsi_bind, - .unbind = sun6i_dsi_unbind, -}; - static int sun6i_dsi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1172,16 +1182,8 @@ static int sun6i_dsi_probe(struct platform_device *pdev) goto err_unprotect_clk; } - ret = component_add(&pdev->dev, &sun6i_dsi_ops); - if (ret) { - dev_err(dev, "Couldn't register our component\n"); - goto err_remove_dsi_host; - } - return 0; -err_remove_dsi_host: - mipi_dsi_host_unregister(&dsi->host); err_unprotect_clk: clk_rate_exclusive_put(dsi->mod_clk); err_attach_clk: @@ -1195,7 +1197,6 @@ static int sun6i_dsi_remove(struct platform_device *pdev) struct device *dev = &pdev->dev; struct sun6i_dsi *dsi = dev_get_drvdata(dev); - component_del(&pdev->dev, &sun6i_dsi_ops); mipi_dsi_host_unregister(&dsi->host); clk_rate_exclusive_put(dsi->mod_clk);