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 X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8F9DC04AB6 for ; Tue, 28 May 2019 07:39:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 95B8F2075B for ; Tue, 28 May 2019 07:39:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Uor4jY1M" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727668AbfE1HjR (ORCPT ); Tue, 28 May 2019 03:39:17 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:44157 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727295AbfE1HjR (ORCPT ); Tue, 28 May 2019 03:39:17 -0400 Received: by mail-pf1-f195.google.com with SMTP id g9so10929095pfo.11 for ; Tue, 28 May 2019 00:39:16 -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=yQVJnM2sj4R+nYxUG9Nne9l7dh6fbmTdyutm/YwtMx0=; b=Uor4jY1MtEZkONU2usE/MnVQd5dj3Tfn6kmxvYM/+8zfdWScV+FayauoWdU3tq05Ju ih+RnNavqlRUxsaidguXi8Zd1fOeNUd5Ro9TRKv1PJXlxJQeHQL20L7ps+V88GEi7fcl rG465zYjyVAH/BeHRWJJqxw/6W3O9t+sVEalg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=yQVJnM2sj4R+nYxUG9Nne9l7dh6fbmTdyutm/YwtMx0=; b=ixL8zdKOLmcdKLgTFaV9HTUmWZX/5B5o2gxqPGm23U4VaUBnDzaQVy5gCNyxMkVl0N eSR985S/QAB3WNjWn27YVwn3sA5VX6TDVJWqIbktBczxHHF5C4KyE0IZa2LyWXPFJNo/ pDFmgtXSa7QI/ulBoWtEK1kvBu8GSAQ8WqDIUS+17WSHejV0zYHWILbL26sF4T4ztPPY eYLRzEO/qlm/fwYTXUc0/wD50zTym/RcjdUG43ZEDZ2lH6/WmiCECmYmC85r0N+TuT/F NUXIQ0F/Z0AY7nxNbsirvKlCzdh63VRm1MPOWa1kwEqjePJ4UUU/WRCsu4PFO4HQaUNZ UOXg== X-Gm-Message-State: APjAAAVMnk7aWncDSun4h+L3BgbNiiIKGX+cP5PXfZYCaUg/b6hefPTs a5ZxcwNYjGuilyRwTW46OZN9Yw== X-Google-Smtp-Source: APXvYqywiAh3QaSgLPIyigYkRgvfuvWVKq0aWO68kqF5JZeJL6svt+W4rpHA95UclwnXxcNmKYqIow== X-Received: by 2002:a63:af44:: with SMTP id s4mr129350119pgo.411.1559029156377; Tue, 28 May 2019 00:39:16 -0700 (PDT) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:b852:bd51:9305:4261]) by smtp.gmail.com with ESMTPSA id g8sm1628011pjp.17.2019.05.28.00.39.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 28 May 2019 00:39:15 -0700 (PDT) From: Hsin-Yi Wang To: linux-arm-kernel@lists.infradead.org Cc: CK Hu , Philipp Zabel , David Airlie , Daniel Vetter , Matthias Brugger , dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3] gpu/drm: mediatek: call mtk_dsi_stop() after mtk_drm_crtc_atomic_disable() Date: Tue, 28 May 2019 15:39:08 +0800 Message-Id: <20190528073908.633-1-hsinyi@chromium.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mtk_dsi_stop() should be called after mtk_drm_crtc_atomic_disable(), which needs ovl irq for drm_crtc_wait_one_vblank(), since after mtk_dsi_stop() is called, ovl irq will be disabled. If drm_crtc_wait_one_vblank() is called after last irq, it will timeout with this message: "vblank wait timed out on crtc 0". This happens sometimes when turning off the screen. In drm_atomic_helper.c#disable_outputs(), the calling sequence when turning off the screen is: 1. mtk_dsi_encoder_disable() --> mtk_output_dsi_disable() --> mtk_dsi_stop(); // sometimes make vblank timeout in atomic_disable --> mtk_dsi_poweroff(); 2. mtk_drm_crtc_atomic_disable() --> drm_crtc_wait_one_vblank(); ... --> mtk_dsi_ddp_stop() --> mtk_dsi_poweroff(); mtk_dsi_poweroff() has reference count design, change to make mtk_dsi_stop() called in mtk_dsi_poweroff() when refcount is 0. Fixes: 0707632b5bac ("drm/mediatek: update DSI sub driver flow for sending commands to panel") Signed-off-by: Hsin-Yi Wang --- change log v2->v3: * remove unnecessary codes in unbind * based on discussion in v2, if we move mtk_dsi_start() to mtk_dsi_poweron(), in order to make mtk_dsi_start() and mtk_dsi_stop() symmetric, will results in no irq for panel with bridge. So we keep mtk_dsi_start() in original place. --- drivers/gpu/drm/mediatek/mtk_dsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index b00eb2d2e086..b7f829ecd3ad 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -630,6 +630,8 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi) if (--dsi->refcount != 0) return; + mtk_dsi_stop(dsi); + if (!mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500)) { if (dsi->panel) { if (drm_panel_unprepare(dsi->panel)) { @@ -696,7 +698,6 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi) } } - mtk_dsi_stop(dsi); mtk_dsi_poweroff(dsi); dsi->enabled = false; -- 2.20.1