From patchwork Fri May 13 20:15:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 12849349 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 54829C433EF for ; Fri, 13 May 2022 20:15:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1382801AbiEMUPf (ORCPT ); Fri, 13 May 2022 16:15:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58788 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379949AbiEMUPe (ORCPT ); Fri, 13 May 2022 16:15:34 -0400 Received: from mail-qv1-xf2f.google.com (mail-qv1-xf2f.google.com [IPv6:2607:f8b0:4864:20::f2f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84E903BBD1 for ; Fri, 13 May 2022 13:15:33 -0700 (PDT) Received: by mail-qv1-xf2f.google.com with SMTP id dv4so7548571qvb.13 for ; Fri, 13 May 2022 13:15:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=z8tyfGIyj4QCjWxzXzO8gJFUZd4JNIC7ZKxyO4yxAcs=; b=F1DwqMbX3C4qM5XgU+UfmsdneLS0XU7rLeNYlh9QwnShg4eBHYTmLougzM4093Zgq3 LeVMSUKpnmOp1po+rlLKyEBMh1uhHNo0MYtEYk6jOB8JwVpzjwio/D3C4D745ZFM8i+a hFZ8UKOQKjO+iEj6taXWN4v3Cv+4Jb2LTbD+0= 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:mime-version :content-transfer-encoding; bh=z8tyfGIyj4QCjWxzXzO8gJFUZd4JNIC7ZKxyO4yxAcs=; b=tOsjcOSqExMJEpKE6WWIpvJcE8p0WdgGhGyPOOd2RmZ60GalQkcJAOBQDqTkJmbgGm BKjsn78yW7pJFFotkZ8xV4n30PghfYJabjKElzSLwdUl2YnJJmjqO/aer6g8zUXp9qf2 YLShoWaETNgOFnHgsYksDJPdOIBjeYU7vbzstaJJgcySqTw0aegbH0/KTDQhuClDd9zg VJIp83AQGvJPZh24VUPHp60sKB7QxIbaJcur0ChZud4Qu0KreO+YPbtPpwhdI7l4L6ZK b2HYOWhPqrk1pyYMbAuAaLoPjShhr4+bOqu19QVGK2TZnNg2YSpbnDB/hYQ1mFO0gNKr lUTQ== X-Gm-Message-State: AOAM530t0oYtJRlHaSYFIaXkpJOtnH4t8CMooQTPRfCXPPwyjAw8l7/o jQvOCy6/QRG2/OoVF4DYAymqp+zgjM7CS9r+FILiLw== X-Google-Smtp-Source: ABdhPJzcImkmUNnAnRYKJR4fAAj/PKirufEjVgtKSVv9x3OVOt1fZUvIBWdxj8liHAinYjSiebfazA== X-Received: by 2002:a17:902:a981:b0:156:229d:6834 with SMTP id bh1-20020a170902a98100b00156229d6834mr5874937plb.128.1652472921993; Fri, 13 May 2022 13:15:21 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:f334:6f80:82ed:5653]) by smtp.gmail.com with ESMTPSA id im2-20020a170902bb0200b0015e8d4eb1bdsm2332362plb.7.2022.05.13.13.15.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 May 2022 13:15:21 -0700 (PDT) From: Douglas Anderson To: Rob Clark , Abhinav Kumar , Dmitry Baryshkov Cc: Dave Stevenson , Douglas Anderson , Bjorn Andersson , Daniel Vetter , David Airlie , Sean Paul , Stephen Boyd , Vinod Koul , dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5] drm/msm/dsi: don't powerup at modeset time for parade-ps8640 Date: Fri, 13 May 2022 13:15:13 -0700 Message-Id: <20220513131504.v5.1.Ia196e35ad985059e77b038a41662faae9e26f411@changeid> X-Mailer: git-send-email 2.36.0.550.gb090851708-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Commit 7d8e9a90509f ("drm/msm/dsi: move DSI host powerup to modeset time") caused sc7180 Chromebooks that use the parade-ps8640 bridge chip to fail to turn the display back on after it turns off. Unfortunately, it doesn't look easy to fix the parade-ps8640 driver to handle the new power sequence. The Linux driver has almost nothing in it and most of the logic for this bridge chip is in black-box firmware that the bridge chip uses. Also unfortunately, reverting the patch will break "tc358762". The long term solution here is probably Dave Stevenson's series [1] that would give more flexibility. However, that is likely not a quick fix. For the short term, we'll look at the compatible of the next bridge in the chain and go back to the old way for the Parade PS8640 bridge chip. If it's found that other bridge chips also need this workaround then we can add them to the list or consider inverting the condition. However, the hope is that the framework will not take too much longer to land and we won't have to add anything other than ps8640 here. [1] https://lore.kernel.org/r/cover.1646406653.git.dave.stevenson@raspberrypi.com Fixes: 7d8e9a90509f ("drm/msm/dsi: move DSI host powerup to modeset time") Suggested-by: Rob Clark Signed-off-by: Douglas Anderson Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar --- Note that, unlike `struct device`, `struct drm_bridge` still has a `#ifdef` around the `of_node`. The extra stub function in this patch is to make sure that we can pass COMPILE_TEST, not because I expect that we'll actually run into real users who are running this driver without device tree. Changes in v5: - Add a comment saying that this is temporary. Changes in v4: - Use the compatible string of the next bridge as per Rob. Changes in v3: - No longer a revert; now a module parameter. Changes in v2: - Remove the mud from my face. drivers/gpu/drm/msm/dsi/dsi_manager.c | 32 ++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c index 50b987658b1f..7fe5eb1dd066 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c @@ -34,6 +34,32 @@ 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]; @@ -389,6 +415,9 @@ static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge) if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id)) return; + if (!dsi_mgr_power_on_early(bridge)) + dsi_mgr_bridge_power_on(bridge); + /* Always call panel functions once, because even for dual panels, * there is only one drm_panel instance. */ @@ -570,7 +599,8 @@ static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge, if (is_bonded_dsi && other_dsi) msm_dsi_host_set_display_mode(other_dsi->host, adjusted_mode); - dsi_mgr_bridge_power_on(bridge); + 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,