From patchwork Fri Apr 15 15:41:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12815109 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 1F831C433F5 for ; Fri, 15 Apr 2022 15:41:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7A86E10E1EC; Fri, 15 Apr 2022 15:41:27 +0000 (UTC) Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id 85BF410E1EC; Fri, 15 Apr 2022 15:41:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1650037286; x=1681573286; h=from:to:cc:subject:date:message-id:mime-version; bh=vQmRn16K4xA0u142eDU+ulgweLDbuAZ9x7nuLXhsVcE=; b=g4FESIKGlPDqRJFAWKHIi1BcUvn/lo6thijZFmpi9wPnjR8GuhytISiP WJhX/PPFnMMYRcAQqQWe2OL5mTc+tIBDpfaaMEtZ7hJRL79HBuM4thn+W Cg6DI37zNu5JCSdpEVCXxTxavQpiod6Y3VsaqHzSiKngXJoPgUes5gM0c c=; Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 15 Apr 2022 08:41:25 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Apr 2022 08:41:25 -0700 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Fri, 15 Apr 2022 08:41:24 -0700 Received: from khsieh-linux1.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Fri, 15 Apr 2022 08:41:23 -0700 From: Kuogee Hsieh To: , , , , , , , , Subject: [PATCH v6] drm/msm/dp: stop event kernel thread when DP unbind Date: Fri, 15 Apr 2022 08:41:16 -0700 Message-ID: <1650037276-27812-1-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) 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: quic_sbillaka@quicinc.com, linux-arm-msm@vger.kernel.org, quic_abhinavk@quicinc.com, dri-devel@lists.freedesktop.org, quic_khsieh@quicinc.com, quic_aravindh@quicinc.com, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Current DP driver implementation, event thread is kept running after DP display is unbind. This patch fix this problem by disabling DP irq and stop event thread to exit gracefully at dp_display_unbind(). Changes in v2: -- start event thread at dp_display_bind() Changes in v3: -- disable all HDP interrupts at unbind -- replace dp_hpd_event_setup() with dp_hpd_event_thread_start() -- replace dp_hpd_event_stop() with dp_hpd_event_thread_stop() -- move init_waitqueue_head(&dp->event_q) to probe() -- move spin_lock_init(&dp->event_lock) to probe() Changes in v4: -- relocate both dp_display_bind() and dp_display_unbind() to bottom of file Changes in v5: -- cancel relocation of both dp_display_bind() and dp_display_unbind() Changes in v5: -- move empty event q to dp_event_thread_start() Fixes: e91e3065a806 ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets") Signed-off-by: Kuogee Hsieh Reported-by: Dmitry Baryshkov Reviewed-by: Stephen Boyd --- drivers/gpu/drm/msm/dp/dp_display.c | 35 ++++++++++++++++++++++++++++------- 1 file changed, 28 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 01453db..92c9819 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -113,6 +113,7 @@ struct dp_display_private { u32 hpd_state; u32 event_pndx; u32 event_gndx; + struct task_struct *ev_tsk; struct dp_event event_list[DP_EVENT_Q_MAX]; spinlock_t event_lock; @@ -230,6 +231,14 @@ void dp_display_signal_audio_complete(struct msm_dp *dp_display) complete_all(&dp->audio_comp); } +static void dp_hpd_event_thread_stop(struct dp_display_private *dp_priv) +{ + kthread_stop(dp_priv->ev_tsk); + +} + +static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv); + static int dp_display_bind(struct device *dev, struct device *master, void *data) { @@ -269,6 +278,7 @@ static int dp_display_bind(struct device *dev, struct device *master, if (rc) DRM_ERROR("Audio registration Dp failed\n"); + rc = dp_hpd_event_thread_start(dp); end: return rc; } @@ -280,6 +290,9 @@ static void dp_display_unbind(struct device *dev, struct device *master, struct drm_device *drm = dev_get_drvdata(master); struct msm_drm_private *priv = drm->dev_private; + /* disable all HPD interrupts */ + dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false); + dp_hpd_event_thread_stop(dp); dp_power_client_deinit(dp->power); dp_aux_unregister(dp->aux); priv->dp[dp->id] = NULL; @@ -1054,7 +1067,7 @@ static int hpd_event_thread(void *data) dp_priv = (struct dp_display_private *)data; - while (1) { + while (!kthread_should_stop()) { if (timeout_mode) { wait_event_timeout(dp_priv->event_q, (dp_priv->event_pndx == dp_priv->event_gndx), @@ -1132,12 +1145,19 @@ static int hpd_event_thread(void *data) return 0; } -static void dp_hpd_event_setup(struct dp_display_private *dp_priv) +static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv) { - init_waitqueue_head(&dp_priv->event_q); - spin_lock_init(&dp_priv->event_lock); + /* set event q to empty */ + dp_priv->event_gndx = 0; + dp_priv->event_pndx = 0; + + dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler"); + if (IS_ERR(dp_priv->ev_tsk)) { + DRM_ERROR("failed to create DP event thread\n"); + return PTR_ERR(dp_priv->ev_tsk); + } - kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler"); + return 0; } static irqreturn_t dp_display_irq_handler(int irq, void *dev_id) @@ -1266,7 +1286,10 @@ static int dp_display_probe(struct platform_device *pdev) return -EPROBE_DEFER; } + /* setup event q */ mutex_init(&dp->event_mutex); + init_waitqueue_head(&dp->event_q); + spin_lock_init(&dp->event_lock); /* Store DP audio handle inside DP display */ dp->dp_display.dp_audio = dp->audio; @@ -1441,8 +1464,6 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display) dp = container_of(dp_display, struct dp_display_private, dp_display); - dp_hpd_event_setup(dp); - dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100); }