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[79.14.29.58]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e3ebcb958sm34829650f8f.21.2026.10.29.07.41.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 07:41:36 -0700 (PDT) From: Dario Binacchi To: dri-devel@lists.freedesktop.org Cc: michael@amarulasolutions.com, linux-amarula@amarulasolutions.com, Dario Binacchi , Andrzej Hajda , David Airlie , Jernej Skrabec , Jonas Karlman , Laurent Pinchart , Laurentiu Palcu , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Robert Foss , Simona Vetter , Thomas Zimmermann , linux-kernel@vger.kernel.org Subject: [PATCH] drm/bridge: fsl-ldb: return -EPROBE_DEFER if the panel bridge is not found Date: Thu, 29 Oct 2026 15:41:28 +0100 Message-ID: <20261029144132.572020-1-dario.binacchi@amarulasolutions.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Original-Sender: dario.binacchi@amarulasolutions.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@amarulasolutions.com header.s=google header.b=hrb88Lfl; spf=pass (google.com: domain of dario.binacchi@amarulasolutions.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=dario.binacchi@amarulasolutions.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=amarulasolutions.com; dara=neutral header.i=@amarulasolutions.com Precedence: list Mailing-list: list linux-amarula@amarulasolutions.com; contact linux-amarula+owners@amarulasolutions.com List-ID: X-Spam-Checked-In-Group: linux-amarula@amarulasolutions.com X-Google-Group-Id: 476853432473 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , of_drm_find_and_get_bridge() returns NULL if the panel has not been registered yet. Returning -ENODEV in this case makes the probe fail instead of being retried, so the LDB is never bound and the display pipeline never comes up: platform 32e90000.display-controller: deferred probe pending: imx-lcdif: Failed to get bridge for endpoint0 Return -EPROBE_DEFER, so that the probe is retried once the panel is available. Fixes: 802372cf316a ("drm/bridge: fsl-ldb: don't create a panel_bridge") Signed-off-by: Dario Binacchi Reviewed-by: Laurentiu Palcu Reviewed-by: Luca Ceresoli --- drivers/gpu/drm/bridge/fsl-ldb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: c339f4010dea8b0d754f84ace70cd1b089878ef8 branch: fsl-ldb-defer-probe diff --git a/drivers/gpu/drm/bridge/fsl-ldb.c b/drivers/gpu/drm/bridge/fsl-ldb.c index 7ec84c81cd78..420b3e08130e 100644 --- a/drivers/gpu/drm/bridge/fsl-ldb.c +++ b/drivers/gpu/drm/bridge/fsl-ldb.c @@ -342,7 +342,7 @@ static int fsl_ldb_probe(struct platform_device *pdev) fsl_ldb->bridge.next_bridge = of_drm_find_and_get_bridge(panel_node); of_node_put(panel_node); if (!fsl_ldb->bridge.next_bridge) - return -ENODEV; + return -EPROBE_DEFER; if (fsl_ldb_is_dual(fsl_ldb)) { struct device_node *port1, *port2;