From patchwork Fri Jan 13 23:56:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13101742 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 A9491C677F1 for ; Fri, 13 Jan 2023 23:56:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231143AbjAMX4k (ORCPT ); Fri, 13 Jan 2023 18:56:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230312AbjAMX4h (ORCPT ); Fri, 13 Jan 2023 18:56:37 -0500 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C000A2DE7 for ; Fri, 13 Jan 2023 15:56:36 -0800 (PST) Received: by mail-pg1-x52f.google.com with SMTP id r18so15995446pgr.12 for ; Fri, 13 Jan 2023 15:56:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; 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=HBRAbkUwcVHYnpIoYhFS8Gcgp00+RQqgzwfjMcTRfn8=; b=CBsLcSyAmbSqlhmELttzLHiRFV0Pbee815YWapJN6gF0sd2nxMN5ceXTUwfPWY1vb6 tQQUO8D+NzkbrARK/MSF+73CIpPAtT7QqL2Di6XBOZcjUCUevQh67WapL9qMwFjKqkIJ ZHcoRYRPJ2BuMgAhKxtLI4kUOmqUNo1orQW1k= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=HBRAbkUwcVHYnpIoYhFS8Gcgp00+RQqgzwfjMcTRfn8=; b=XFx+wjuEqm93Vslg1XT8mN/v20dKgTOT59N8hziv8hI5KRfAVgOmsFXqvD8/OdsJpz QZDfnM9bv+ftfmG+PvozLXd+e7E2rocpEIa3yqzxa05eflZDg4OqAWYNJS2u0PgjcM37 ypcwT/wj06c3OLN/6K5IzlS369C7Ru6pRtDFcCVb4XSUn9uOJ1YVekGzF/MJXxMhGz+C rBJv18VJUICqx/vkDDXG5dxo7lOqBQMMA4ui622ql5bj7vlUtVyPDT4eCzGn2LbZ1npn ArVO+IFaGn5hiQumLeAKATZ/81sAQMWWs0ziE+CSDRHim1JaXRERN/FFiX2nLrdsRgY4 L/Yg== X-Gm-Message-State: AFqh2koODIWw1sC3dSkj7nCK2Xc18aY8u65Tb7vr0hPtwRQqLgUWqlFy ngEaQVf61wUuBtwXGb3saPv3/w== X-Google-Smtp-Source: AMrXdXuomsdDatJcgff6JJQdXFgh43w+wzL4U0XQAyLogqR8FHf1P6mgKPSLl8kF4/dLARQ97ol6+w== X-Received: by 2002:a62:1693:0:b0:583:9b05:d1f0 with SMTP id 141-20020a621693000000b005839b05d1f0mr25361391pfw.33.1673654196266; Fri, 13 Jan 2023 15:56:36 -0800 (PST) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:b4ad:3c49:1195:a01e]) by smtp.gmail.com with ESMTPSA id f10-20020aa79d8a000000b005823b7da05asm10002737pfq.122.2023.01.13.15.56.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Jan 2023 15:56:35 -0800 (PST) From: Douglas Anderson To: dri-devel@lists.freedesktop.org, Rob Clark , Abhinav Kumar , Dmitry Baryshkov Cc: Daniel Vetter , Andrzej Hajda , Dave Stevenson , Robert Foss , Sean Paul , Jonas Karlman , Laurent Pinchart , Neil Armstrong , David Airlie , linux-arm-msm@vger.kernel.org, Stephen Boyd , Jernej Skrabec , Vinod Koul , Douglas Anderson , freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, ye xingchen Subject: [RFT PATCH 2/2] drm/msm/dsi: Stop unconditionally powering up DSI hosts at modeset Date: Fri, 13 Jan 2023 15:56:04 -0800 Message-Id: <20230113155547.RFT.2.I4cfeab9d0e07e98ead23dd0736ab4461e6c69002@changeid> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog In-Reply-To: <20230113155547.RFT.1.I723a3761d57ea60c5dd754c144aed6c3b2ea6f5a@changeid> References: <20230113155547.RFT.1.I723a3761d57ea60c5dd754c144aed6c3b2ea6f5a@changeid> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org In commit 7d8e9a90509f ("drm/msm/dsi: move DSI host powerup to modeset time"), we moved powering up DSI hosts to modeset time. This wasn't because it was an elegant design, but there were no better options. That commit actually ended up breaking ps8640, and thus was born commit ec7981e6c614 ("drm/msm/dsi: don't powerup at modeset time for parade-ps8640") as a temporary hack to un-break ps8640 by moving it to the old way of doing things. It turns out that ps8640 _really_ doesn't like its pre_enable() function to be called after dsi_mgr_bridge_power_on(). Specifically (from experimentation, not because I have any inside knowledge), it looks like the assertion of "RST#" in the ps8640 runtime resume handler seems like it's not allowed to happen after dsi_mgr_bridge_power_on() Recently, Dave Stevenson's series landed allowing bridges some control over pre_enable ordering. The meaty commit for our purposes is commit 4fb912e5e190 ("drm/bridge: Introduce pre_enable_prev_first to alter bridge init order"). As documented by that series, if a bridge doesn't set "pre_enable_prev_first" then we should use the old ordering. Now that we have the commit ("drm/bridge: tc358762: Set pre_enable_prev_first") we can go back to the old ordering, which also allows us to remove the ps8640 special case. One last note is that even without reverting commit 7d8e9a90509f ("drm/msm/dsi: move DSI host powerup to modeset time"), if you _just_ revert the ps8640 special case and try it out then it doesn't seem to fail anymore. I spent time bisecting / debugging this and it turns out to be mostly luck, so we still want this patch to make sure it's solid. Specifically the reason it sorta works these days is because we implemented wait_hpd_asserted() in ps8640 now, plus the magic of "pm_runtime" autosuspend. The fact that we have wait_hpd_asserted() implemented means that we actually power the bridge chip up just a wee bit earlier and then the bridge happens to stay on because of autosuspend and thus ends up powered before dsi_mgr_bridge_power_on(). Cc: Dave Stevenson Cc: Dmitry Baryshkov Cc: Abhinav Kumar Signed-off-by: Douglas Anderson --- drivers/gpu/drm/msm/dsi/dsi_manager.c | 68 +++++---------------------- 1 file changed, 11 insertions(+), 57 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c index 3a1417397283..5e6b8d423b96 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c @@ -34,32 +34,6 @@ static struct msm_dsi_manager msm_dsim_glb; #define IS_SYNC_NEEDED() (msm_dsim_glb.is_sync_needed) #define IS_MASTER_DSI_LINK(id) (msm_dsim_glb.master_dsi_link_id == id) -#ifdef CONFIG_OF -static bool dsi_mgr_power_on_early(struct drm_bridge *bridge) -{ - struct drm_bridge *next_bridge = drm_bridge_get_next_bridge(bridge); - - /* - * If the next bridge in the chain is the Parade ps8640 bridge chip - * then don't power on early since it seems to violate the expectations - * of the firmware that the bridge chip is running. - * - * NOTE: this is expected to be a temporary special case. It's expected - * that we'll eventually have a framework that allows the next level - * bridge to indicate whether it needs us to power on before it or - * after it. When that framework is in place then we'll use it and - * remove this special case. - */ - return !(next_bridge && next_bridge->of_node && - of_device_is_compatible(next_bridge->of_node, "parade,ps8640")); -} -#else -static inline bool dsi_mgr_power_on_early(struct drm_bridge *bridge) -{ - return true; -} -#endif - static inline struct msm_dsi *dsi_mgr_get_dsi(int id) { return msm_dsim_glb.dsi[id]; @@ -254,7 +228,7 @@ static void msm_dsi_manager_set_split_display(u8 id) } } -static void dsi_mgr_bridge_power_on(struct drm_bridge *bridge) +static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge) { int id = dsi_mgr_bridge_get_id(bridge); struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id); @@ -300,36 +274,10 @@ static void dsi_mgr_bridge_power_on(struct drm_bridge *bridge) if (is_bonded_dsi && msm_dsi1) msm_dsi_host_enable_irq(msm_dsi1->host); - return; - -host1_on_fail: - msm_dsi_host_power_off(host); -host_on_fail: - dsi_mgr_phy_disable(id); -phy_en_fail: - return; -} - -static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge) -{ - int id = dsi_mgr_bridge_get_id(bridge); - struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id); - struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1); - struct mipi_dsi_host *host = msm_dsi->host; - bool is_bonded_dsi = IS_BONDED_DSI(); - int ret; - - DBG("id=%d", id); - if (!msm_dsi_device_connected(msm_dsi)) - return; - /* Do nothing with the host if it is slave-DSI in case of bonded DSI */ if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id)) return; - if (!dsi_mgr_power_on_early(bridge)) - dsi_mgr_bridge_power_on(bridge); - ret = msm_dsi_host_enable(host); if (ret) { pr_err("%s: enable host %d failed, %d\n", __func__, id, ret); @@ -349,7 +297,16 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge) host1_en_fail: msm_dsi_host_disable(host); host_en_fail: - + msm_dsi_host_disable_irq(host); + if (is_bonded_dsi && msm_dsi1) { + msm_dsi_host_disable_irq(msm_dsi1->host); + msm_dsi_host_power_off(msm_dsi1->host); + } +host1_on_fail: + msm_dsi_host_power_off(host); +host_on_fail: + dsi_mgr_phy_disable(id); +phy_en_fail: return; } @@ -438,9 +395,6 @@ static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge, msm_dsi_host_set_display_mode(host, adjusted_mode); if (is_bonded_dsi && other_dsi) msm_dsi_host_set_display_mode(other_dsi->host, adjusted_mode); - - if (dsi_mgr_power_on_early(bridge)) - dsi_mgr_bridge_power_on(bridge); } static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,