From nobody Sun Sep 21 21:38:52 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AF610CDB465 for ; Mon, 16 Oct 2023 16:57:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234364AbjJPQ5G (ORCPT ); Mon, 16 Oct 2023 12:57:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234388AbjJPQ4l (ORCPT ); Mon, 16 Oct 2023 12:56:41 -0400 Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [IPv6:2a00:1450:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 18DB53841 for ; Mon, 16 Oct 2023 09:54:12 -0700 (PDT) Received: by mail-wm1-x32c.google.com with SMTP id 5b1f17b1804b1-4075c58ac39so48876275e9.3 for ; Mon, 16 Oct 2023 09:54:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1697475250; x=1698080050; darn=vger.kernel.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=tDlsbj0O4m938XJJJjIOKHw+A0HfBTEQDaR3qGbI7EM=; b=ebRdFCkTp69mnesA4vlUP9qPwXgAjbDp4ttEGNZADsJK35BzSGJpjHDA6dB6/IbUl8 3B7tBYYoe3uS+wQIHeyXN0EcdR2sFJU1cxV7sX21nhk+riZphRYMr200XHEkeeu3Axzx iDFVhkIm0Uh3t9bbBnWA4B+shgKFsONE1jjTmn2k2L5m7N37dSOej+B94a1noOPIEoNG PnoG3QjLrsw5OPp7qdnMGQGgmgelvKtvYAohwU3ggc2wsCTh11IsDutMQQJBFHXM42kL 0rMDZ4yF5V23jfH4u+pLiaNGgIvbZZC9uWDtk31IenfRM8rqhR7j1cyc2gsA22XKqQOp OCLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697475250; x=1698080050; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=tDlsbj0O4m938XJJJjIOKHw+A0HfBTEQDaR3qGbI7EM=; b=IPpfZ2M3Xx+Tl4c4C8iZ/9C6YA3k5uGGEFtDTmVAmuh9gSPg1/v9b1qhQCeMBaNc/L L9sskabj/Gq1hlhpQDZLvDYVFdR8YfmVMGrol4uQjsjiVRwA/EWCwoYDYudaXqvjHguY pmWD3yw2wmBbQRiX12lixCmO8bKApXKJGOjq12KIpmNp2voCN4Q1tXW7SfpJAivOFFM3 zryQ6hp+Q4ZFB5Qs3w6kAFF9HccCRz1EAQsBKddPDho1XnWcMXMzwaMvAEJI3ePJjdN1 ijp7TqC1jAr3TYxgQrZr5mCi+ExtISXwq4bjMJza4HfBG8EeApxwuMJ150CL7CsxSqhJ B4Gg== X-Gm-Message-State: AOJu0YwWQzKKIBt/fY5mqlYRA9kbG6Le3mSQF23DW2ayeEDM9+uwvgXu bHjNamAo6Bh3ZkItCazaflP4sA== X-Google-Smtp-Source: AGHT+IHo4VTLj6QFSkMq4vzDZuAnsr0A18LuIJLePvTKSU99Hb1c9SVuY4KiSXHIr1fuYLLcUJPY5Q== X-Received: by 2002:a7b:c7d7:0:b0:3fd:2e89:31bd with SMTP id z23-20020a7bc7d7000000b003fd2e8931bdmr30618680wmk.14.1697475250508; Mon, 16 Oct 2023 09:54:10 -0700 (PDT) Received: from eriador.lumag.spb.ru ([45.84.211.189]) by smtp.gmail.com with ESMTPSA id s19-20020a05600c45d300b0040648217f4fsm7638996wmo.39.2023.10.16.09.54.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Oct 2023 09:54:10 -0700 (PDT) From: Dmitry Baryshkov To: Dave Stevenson , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Douglas Anderson , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , Konrad Dybcio , Jessica Zhang Cc: Marek Vasut , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org Subject: [RFC PATCH 07/10] drm/bridge: ps8640: require manual DSI power control Date: Mon, 16 Oct 2023 19:53:52 +0300 Message-ID: <20231016165355.1327217-8-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231016165355.1327217-1-dmitry.baryshkov@linaro.org> References: <20231016165355.1327217-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The Parade PS8640 bridge will fail to start if the DSI link is enabled when the bridge is being reset / powered up (even to the LP-11 state). To ensure that the DSI link is powered down, require manual control over the DSI link state. Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/bridge/parade-ps8640.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridg= e/parade-ps8640.c index 8161b1a1a4b1..6c5daaa70cb7 100644 --- a/drivers/gpu/drm/bridge/parade-ps8640.c +++ b/drivers/gpu/drm/bridge/parade-ps8640.c @@ -458,6 +458,10 @@ static void ps8640_atomic_pre_enable(struct drm_bridge= *bridge, =20 ps8640_bridge_vdo_control(ps_bridge, ENABLE); =20 + ret =3D mipi_dsi_host_power_up(ps_bridge->dsi->host); + if (ret < 0) + dev_warn(dev, "failed to power up DSI host: %d\n", ret); + ps_bridge->pre_enabled =3D true; } =20 @@ -468,6 +472,8 @@ static void ps8640_atomic_post_disable(struct drm_bridg= e *bridge, =20 ps_bridge->pre_enabled =3D false; =20 + mipi_dsi_host_power_down(ps_bridge->dsi->host); + ps8640_bridge_vdo_control(ps_bridge, DISABLE); pm_runtime_put_sync_suspend(&ps_bridge->page[PAGE0_DP_CNTL]->dev); } @@ -562,6 +568,11 @@ static int ps8640_bridge_get_dsi_resources(struct devi= ce *dev, struct ps8640 *ps if (!host) return -EPROBE_DEFER; =20 + if (!mipi_dsi_host_power_control_available(host)) { + dev_err(dev, "MIPI DSI host doesn't provide tight power control\n"); + return -ENODEV; + } + dsi =3D devm_mipi_dsi_device_register_full(dev, host, &info); if (IS_ERR(dsi)) { dev_err(dev, "failed to create dsi device\n"); @@ -572,7 +583,8 @@ static int ps8640_bridge_get_dsi_resources(struct devic= e *dev, struct ps8640 *ps =20 dsi->host =3D host; dsi->mode_flags =3D MIPI_DSI_MODE_VIDEO | - MIPI_DSI_MODE_VIDEO_SYNC_PULSE; + MIPI_DSI_MODE_VIDEO_SYNC_PULSE | + MIPI_DSI_MANUAL_POWERUP; dsi->format =3D MIPI_DSI_FMT_RGB888; dsi->lanes =3D NUM_MIPI_LANES; =20 --=20 2.42.0