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=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 2740AC4332B for ; Mon, 23 Mar 2020 23:08:20 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id E2FFA20409 for ; Mon, 23 Mar 2020 23:08:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=agner.ch header.i=@agner.ch header.b="sESt+Sxk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E2FFA20409 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=agner.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 42ED96E03F; Mon, 23 Mar 2020 23:08:19 +0000 (UTC) Received: from mail.kmu-office.ch (mail.kmu-office.ch [IPv6:2a02:418:6a02::a2]) by gabe.freedesktop.org (Postfix) with ESMTPS id CD6A36E03F for ; Mon, 23 Mar 2020 23:08:17 +0000 (UTC) Received: from webmail.kmu-office.ch (unknown [IPv6:2a02:418:6a02::a3]) by mail.kmu-office.ch (Postfix) with ESMTPSA id 2379E5C061C; Tue, 24 Mar 2020 00:08:16 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=agner.ch; s=dkim; t=1585004896; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+vZc0JqXmLOdU7i7ES72S81rQPOAnqvhRVv6N/GSz64=; b=sESt+Sxkxtn6tAmSP2/ZTEabuyPiaGC1sJWdc76Eb/Zedx5lz9WVRxcei6QH6X8V03Jmsg hbkxVXTIIDh0k4kNqcatxMTgsDUWGuC7u9QxnRVnEApwXa/mj5kz3Opqy5pleqdLMJJKid 84LCInqTDUSE07IHAA+i65I+JTaqji0= MIME-Version: 1.0 Date: Tue, 24 Mar 2020 00:08:16 +0100 From: Stefan Agner To: Laurent Pinchart Subject: Re: [PATCH 14/21] drm: mxsfb: Enable vblank handling In-Reply-To: <20200309195216.31042-15-laurent.pinchart@ideasonboard.com> References: <20200309195216.31042-1-laurent.pinchart@ideasonboard.com> <20200309195216.31042-15-laurent.pinchart@ideasonboard.com> User-Agent: Roundcube Webmail/1.4.1 Message-ID: X-Sender: stefan@agner.ch 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: , Cc: Marek Vasut , kernel@pengutronix.de, dri-devel@lists.freedesktop.org, linux-imx@nxp.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 2020-03-09 20:52, Laurent Pinchart wrote: > Enable vblank handling when the CRTC is turned on and disable it when it > is turned off. This requires moving vblank init after the KMS pipeline > initialisation, otherwise drm_vblank_init() gets called with 0 CRTCs. > > Signed-off-by: Laurent Pinchart With this patch applied I start to get system resets on my Colibri iMX7 test device during system boot shortly after initializing mxsfb. It happens not on every boot, but rather often, I would say every second or third. From what I can tell the interrupt handling should be safe, but it seems that every now and then something races. Any idea what that could be? -- Stefan > --- > drivers/gpu/drm/mxsfb/mxsfb_drv.c | 15 +++++++++------ > drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 +++++- > 2 files changed, 14 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c > b/drivers/gpu/drm/mxsfb/mxsfb_drv.c > index e324bd2a63a5..72b4f6a947a4 100644 > --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c > +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c > @@ -160,12 +160,6 @@ static int mxsfb_load(struct drm_device *drm, > unsigned long flags) > > pm_runtime_enable(drm->dev); > > - ret = drm_vblank_init(drm, drm->mode_config.num_crtc); > - if (ret < 0) { > - dev_err(drm->dev, "Failed to initialise vblank\n"); > - goto err_vblank; > - } > - > /* Modeset init */ > drm_mode_config_init(drm); > > @@ -175,6 +169,15 @@ static int mxsfb_load(struct drm_device *drm, > unsigned long flags) > goto err_vblank; > } > > + ret = drm_vblank_init(drm, drm->mode_config.num_crtc); > + if (ret < 0) { > + dev_err(drm->dev, "Failed to initialise vblank\n"); > + goto err_vblank; > + } > + > + /* Start with vertical blanking interrupt reporting disabled. */ > + drm_crtc_vblank_off(&mxsfb->crtc); > + > ret = mxsfb_attach_bridge(mxsfb); > if (ret) { > dev_err(drm->dev, "Cannot connect bridge: %d\n", ret); > diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c > b/drivers/gpu/drm/mxsfb/mxsfb_kms.c > index ac2696c8483d..640305fb1068 100644 > --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c > +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c > @@ -322,8 +322,10 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, > dma_addr_t paddr; > > pm_runtime_get_sync(drm->dev); > - > mxsfb_enable_axi_clk(mxsfb); > + > + drm_crtc_vblank_on(crtc); > + > mxsfb_crtc_mode_set_nofb(mxsfb); > > /* Write cur_buf as well to avoid an initial corrupt frame */ > @@ -353,6 +355,8 @@ static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc, > } > spin_unlock_irq(&drm->event_lock); > > + drm_crtc_vblank_off(crtc); > + > mxsfb_disable_axi_clk(mxsfb); > pm_runtime_put_sync(drm->dev); > } _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel