From mboxrd@z Thu Jan 1 00:00:00 1970 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 808C0CD4F3C for ; Wed, 20 May 2026 09:26:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E9EAB10EFB4; Wed, 20 May 2026 09:26:46 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="MhyGhcEs"; dkim-atps=neutral Received: from mail-wm1-f50.google.com (mail-wm1-f50.google.com [209.85.128.50]) by gabe.freedesktop.org (Postfix) with ESMTPS id F276810EFB4 for ; Wed, 20 May 2026 09:26:42 +0000 (UTC) Received: by mail-wm1-f50.google.com with SMTP id 5b1f17b1804b1-4893940bb5eso25251265e9.3 for ; Wed, 20 May 2026 02:26:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1779269201; x=1779874001; darn=lists.freedesktop.org; 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=+SCjCJBZvnIiFnT2W/ro1v1Aq/+Z3LzD35axaVYH+sU=; b=MhyGhcEsA3E3WD8zEb2Yd/5ytoYTDdBuiX/2kAjBhWIo3Uyqop3IQUb+QPsoO5ODLR qGtKg+yLX7mp2lSHrWcpAXs6vHsunoBUpTp60vUDQU7bBdgC/SKJdvYNW5bW7C+G6LrJ 3S7EswQbPK83MOdGyHvPl7GVMs9CbRJsMD2NUgAFzVvUpGrAfNRlA2UUFAATCBucx5Tg aEwb1ZoyJga2/b+7ZgEZyizCbDu6g9TfHnAgJ0rkHqUq48oSiJEYHDoHFsfNgWTr6J77 Ya7FI5NyC6b4FrCiK4Vh407vLn6Jm5KyEtP6ssJH7VkVjSdFOxQnPPEJPlBwyopk1DRP GMyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779269201; x=1779874001; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=+SCjCJBZvnIiFnT2W/ro1v1Aq/+Z3LzD35axaVYH+sU=; b=abKPRrwSI1j72J90jH8ukNSAiNfC8YIqRxw1UjWYGm677MxnIsKJ8k4hWSSTy75rXA HTwb7j929int3QykbfJgpI6yt9PpfDrgZUzo2GFCqWQLx+dazEWXIlVL+cWNXtlhgkWa OmrdRS5PwL6fp1OJMYBzZz3NuP8j/v5nEOTko63YSVLzZPlnVCEgPhO8KVHPx9w58I0v Lz+gVP/AZCCAWBTXxgP5DQLvmzcDWu6uQCHVH0IhR8y2fyEZ4x75+1/FfGkajHwby1BF QVMlhKdedlwUJGH7GAuyGMSZxaCABGB9LDu3M3bgcxC2ZrC2HgJwLlKOM0ZwWvOc2YMH mHiQ== X-Gm-Message-State: AOJu0YxbgMbmOSVwu7CFX1QIu/e+j3RRxmOp93TleqOGmTRy26RJuQln 0WbXC4MzaA6I/TFoF74v/bEAZr+GQ9IGTSau+oBVcB3dv+YOe1FBYryD X-Gm-Gg: Acq92OESJ6LLl72Tsbgfmaw0BnczjY7dkbe0bc7pcfhGF1AoC1cmIy4jWRsEnqymi14 C4MQkjm8aGWX1N5L9Guy+UOrq/sa53rc0LwbPRY45KD87Lz+8YzOsNhPwKxvrwyZedAXcm2dxnp M4TrJ2D7M1VXtUeqO6Tpwf/uulqIKIaa8oQZUVLi17dOq6EdlFHVFkH/eR5OSPkTnzqhPSBp6t5 JAfRtb3V1SXdZpXH2eCzbxVplHI77puOzSj0GW8WiTCodf8ZvcTbIxAsC+M1E2IAXPt4gxyCpch JgaqaUQytfLGnigAkHSFITJ78eeuBiqiDQj881dC0tIKVKoYM3GpZyxSh9nNBYrOkYPx4uc7amf 4qZ48tr+3dQpKuasF5V736sLuWj8UgcDDojO7dieRnzvM/v9sl/w8rS12Kde/2FBJVWPAoiWKw0 5g8m2eTMPDKECR X-Received: by 2002:a05:600c:310f:b0:48f:d346:e646 with SMTP id 5b1f17b1804b1-48fe60d5693mr337098675e9.10.1779269201416; Wed, 20 May 2026 02:26:41 -0700 (PDT) Received: from xeon ([188.163.112.61]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49031731733sm7960805e9.0.2026.05.20.02.26.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2026 02:26:40 -0700 (PDT) From: Svyatoslav Ryhel To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Svyatoslav Ryhel Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 1/1] gpu/drm: bridge: tc358768: Add delay after PLL setup Date: Wed, 20 May 2026 12:26:28 +0300 Message-ID: <20260520092628.47539-2-clamor95@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260520092628.47539-1-clamor95@gmail.com> References: <20260520092628.47539-1-clamor95@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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" After tc358768_setup_pll() enables PLL_CKEN and the lock indicator comes up, the DSI register sequence runs near immediately. On TF700T this results in the bridge claiming PLL lock but producing no DSI video output: the panel powers up, the backlight comes on, but the framebuffer is never scanned out. Insert a small settling delay between PLL setup and the rest of the attach. Suggested-by: Michele Brocco Tested-by: Michele Brocco # TF700T Signed-off-by: Svyatoslav Ryhel --- drivers/gpu/drm/bridge/tc358768.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c index 0f2820b37302..17abb24a7181 100644 --- a/drivers/gpu/drm/bridge/tc358768.c +++ b/drivers/gpu/drm/bridge/tc358768.c @@ -824,6 +824,9 @@ static void tc358768_bridge_atomic_pre_enable(struct drm_bridge *bridge, return; } + /* Allow the PLL to settle */ + msleep(20); + drm_display_mode_to_videomode(mode, &vm); dsiclk = priv->dsiclk; -- 2.51.0