From patchwork Thu Oct 13 11:04:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pin-yen Lin X-Patchwork-Id: 13005855 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 A286FC4332F for ; Thu, 13 Oct 2022 11:04:41 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0643010E7EA; Thu, 13 Oct 2022 11:04:36 +0000 (UTC) Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5D1DE10E7ED for ; Thu, 13 Oct 2022 11:04:31 +0000 (UTC) Received: by mail-pj1-x102a.google.com with SMTP id t10-20020a17090a4e4a00b0020af4bcae10so1574180pjl.3 for ; Thu, 13 Oct 2022 04:04:31 -0700 (PDT) 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=0yF0qS9tpjnO5hKItBT5kTiggjtXt00AKvk0lGYLixs=; b=lBd+WLazCAhdHwvY2Ydhae9hCVMbvMx0M3hb3hy0vujF2bvWl0gPMyEqZGHGXh6OVj sUYmtigt3bUR5i8ZVQ/KOl9sCb04tIaF2JW0rkmxBPvMGSHvtV2TTinTDMwaqiOky0cf +FVbSuyM3Ll7gEXcjrLD37S0ElVORRerxb+R8= 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=0yF0qS9tpjnO5hKItBT5kTiggjtXt00AKvk0lGYLixs=; b=1gYBzS4HbA5s8eX/E0dYdCTK0nMjYzVNzAiAQDujWVt4jOamofSp++yw/2mEeeOaV8 LvWD8iMlNAkkww5GT8l7TFWTDqcHAmSlRbhSyW95PmiUheaiRDfdSvGBuw7b41KjIX94 al1/bKdH+HqHtTlvOIu47Ik6bB8gepUvfSsXkdqKJemaKw9a+WHpEYgISPpihVLB5ATG uc8lVjO5R8dIt3HYgFTpgOW1enSmVGNSir1rFnO2g3p/rLJcWZ3Epx5M6aEMHXY0+oU7 pD5xqZN9/RRuNAFJPbN+VpZmWx8QzjzO+d9w4r98aoK2pqXiYEG22zB+prnrzMBQNJXp tISg== X-Gm-Message-State: ACrzQf3CISJ4tzxVFNCQLApMINY/8dnOIf6SUOGpzhs15/hNKUWTXNsj otsFKzuAZm6Mzn5pldpJrw/Hcg== X-Google-Smtp-Source: AMsMyM5n8b4kdcavLxHUEz7UcQdZzikHP9Q/BHDphy9Lvrobv7/aRxwlsifSGGLCA2RYZPw8FkPXcQ== X-Received: by 2002:a17:90b:4b8b:b0:20d:ac2f:8bb2 with SMTP id lr11-20020a17090b4b8b00b0020dac2f8bb2mr1353420pjb.194.1665659070952; Thu, 13 Oct 2022 04:04:30 -0700 (PDT) Received: from treapking.tpe.corp.google.com ([2401:fa00:1:10:4b90:18ed:8d41:7622]) by smtp.gmail.com with ESMTPSA id o11-20020a17090ab88b00b0020af2411721sm2914794pjr.34.2022.10.13.04.04.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Oct 2022 04:04:30 -0700 (PDT) From: Pin-yen Lin To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter Subject: [PATCH v2 3/3] drm/bridge: it6505: Improve synchronization between extcon subsystem Date: Thu, 13 Oct 2022 19:04:10 +0800 Message-Id: <20221013110411.1674359-4-treapking@chromium.org> X-Mailer: git-send-email 2.38.0.rc1.362.ged0d419d3c-goog In-Reply-To: <20221013110411.1674359-1-treapking@chromium.org> References: <20221013110411.1674359-1-treapking@chromium.org> MIME-Version: 1.0 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: Pin-yen Lin , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Originally, the it6505 relies on a short sleep in the IRQ handler and a long sleep to make sure it6505->lane_swap and it6505->lane_count is configured in it6505_extcon_work and it6505_detect, respectively. Use completion and additional DPCD read to remove the unnecessary waits, and use a different lock for it6505_extcon_work and the threaded IRQ handler because they no longer need to run exclusively. The wait time of the completion is usually less than 10ms in local experiments, but leave it larger here just in case. Signed-off-by: Pin-yen Lin Reviewed-by: Robert Foss --- Changes in v2: - Add the empty line back drivers/gpu/drm/bridge/ite-it6505.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index 4b6061272599..0de44c651c60 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -412,6 +412,7 @@ struct it6505 { * Mutex protects extcon and interrupt functions from interfering * each other. */ + struct mutex irq_lock; struct mutex extcon_lock; struct mutex mode_lock; /* used to bridge_detect */ struct mutex aux_lock; /* used to aux data transfers */ @@ -440,7 +441,7 @@ struct it6505 { enum hdcp_state hdcp_status; struct delayed_work hdcp_work; struct work_struct hdcp_wait_ksv_list; - struct completion wait_edid_complete; + struct completion extcon_completion; u8 auto_train_retry; bool hdcp_desired; bool is_repeater; @@ -2316,8 +2317,8 @@ static void it6505_irq_hpd(struct it6505 *it6505) it6505->hpd_state ? "high" : "low"); if (it6505->hpd_state) { - wait_for_completion_timeout(&it6505->wait_edid_complete, - msecs_to_jiffies(6000)); + wait_for_completion_timeout(&it6505->extcon_completion, + msecs_to_jiffies(1000)); it6505_aux_on(it6505); if (it6505->dpcd[0] == 0) { it6505_get_dpcd(it6505, DP_DPCD_REV, it6505->dpcd, @@ -2493,8 +2494,7 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data) }; int int_status[3], i; - msleep(100); - mutex_lock(&it6505->extcon_lock); + mutex_lock(&it6505->irq_lock); if (it6505->enable_drv_hold || !it6505->powered) goto unlock; @@ -2524,7 +2524,7 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data) } unlock: - mutex_unlock(&it6505->extcon_lock); + mutex_unlock(&it6505->irq_lock); return IRQ_HANDLED; } @@ -2701,9 +2701,12 @@ static void it6505_extcon_work(struct work_struct *work) */ if (ret) it6505_poweron(it6505); + + complete_all(&it6505->extcon_completion); } else { DRM_DEV_DEBUG_DRIVER(dev, "start to power off"); pm_runtime_put_sync(dev); + reinit_completion(&it6505->extcon_completion); drm_helper_hpd_irq_event(it6505->bridge.dev); memset(it6505->dpcd, 0, sizeof(it6505->dpcd)); @@ -3274,6 +3277,7 @@ static int it6505_i2c_probe(struct i2c_client *client, if (!it6505) return -ENOMEM; + mutex_init(&it6505->irq_lock); mutex_init(&it6505->extcon_lock); mutex_init(&it6505->mode_lock); mutex_init(&it6505->aux_lock); @@ -3329,7 +3333,7 @@ static int it6505_i2c_probe(struct i2c_client *client, INIT_WORK(&it6505->link_works, it6505_link_training_work); INIT_WORK(&it6505->hdcp_wait_ksv_list, it6505_hdcp_wait_ksv_list); INIT_DELAYED_WORK(&it6505->hdcp_work, it6505_hdcp_work); - init_completion(&it6505->wait_edid_complete); + init_completion(&it6505->extcon_completion); memset(it6505->dpcd, 0, sizeof(it6505->dpcd)); it6505->powered = false; it6505->enable_drv_hold = DEFAULT_DRV_HOLD;