From patchwork Fri Nov 27 09:23:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 11935219 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 810B6C2D0E4 for ; Fri, 27 Nov 2020 09:23:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D66D21D7F for ; Fri, 27 Nov 2020 09:23:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="xXo1mpme" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726178AbgK0JXV (ORCPT ); Fri, 27 Nov 2020 04:23:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42396 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726014AbgK0JXU (ORCPT ); Fri, 27 Nov 2020 04:23:20 -0500 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59189C0613D1 for ; Fri, 27 Nov 2020 01:23:20 -0800 (PST) Received: by mail-lj1-x241.google.com with SMTP id f18so5172301ljg.9 for ; Fri, 27 Nov 2020 01:23:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=dDVGerivDhcovGvlrg4RdGN4PhZ+oBrQSqPNlOoN/KE=; b=xXo1mpme3FQkxz7YOniDXUXLh1hheRztkvuFD0BgV002eFkuLs9/dcgDiWWCkpLt1h e1g5XSCd/9I2I221sERnEP5Fl3x2MhneduRxljWEjh4cMBhD/La7eSfE+qUnugOnZmvQ CTYXTVxuM/C5YrnndrLDTMSY/njX9IEXElhdv3mUHj9yJCDG845sHyPDxgeFGjR2Kt6B fYw7wfn1t5zKg1WL1I18oLC5Aq1lLeCDWszonc6zgKx8SDoPTC+FPtYEisuLI5e4jASN 3pFbXg6iE0k75/7eStyKP54QMo2n+JxTlPeaRbJPAhsys/nCn/ARQB+lI/K9/Yx9xU8m 29GQ== 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=dDVGerivDhcovGvlrg4RdGN4PhZ+oBrQSqPNlOoN/KE=; b=o5xOyxLQ+U94YU+3JCC8wFyMIlqtD8TNjqSCoXccB8y6yz7CUfb7UJ6dRabX8yfa1G w0XCfQAv0SUjaLorQGIUMOyCG2bkLzynC+QTHLfACn/TqghwRJmQYDW+9wL+yxd2Konw K7VFx4QskkmmvZvb9ked5Kq0X7a+jXi9zAhbCIb5jXuIbHDqMZlImG0hotOqczYG6I04 DxOGtLShEHH2rdvz6BU+tyn2crG7jnmiatU6no5+uhwzQMH0nKybXJDusi1TdBsoJI1G c7nd6z914bnIrZJ/gKH72xOHTnAs/ovs3GvhdD3M/r8NU7gsRlIjzJyH9QjmtoW+inb1 8NLg== X-Gm-Message-State: AOAM533BaNUmlGRzaNa+N3enHXqk5vJ8Z9oHsZ+ZMGJnkP/kfoL56MUF EhNKLKCTz7LPX8N8jRGkpd1Z3A== X-Google-Smtp-Source: ABdhPJw2T3Uh8Fn3UGKCfLRGJRb/SWo+VxiKeMYglY+tch0H/sdr9lyw+X2xetxPm3T4VEjuJwptvA== X-Received: by 2002:a2e:998e:: with SMTP id w14mr3176710lji.100.1606468998738; Fri, 27 Nov 2020 01:23:18 -0800 (PST) Received: from eriador.lumag.spb.ru ([188.162.64.79]) by smtp.gmail.com with ESMTPSA id a6sm615442lfi.107.2020.11.27.01.23.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Nov 2020 01:23:17 -0800 (PST) From: Dmitry Baryshkov To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org Cc: Daniel Vetter , David Airlie , Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Vinod Koul , Sam Ravnborg , Manivannan Sadhasivam Subject: [PATCH 1/2] drm/bridge/lontium-lt9611uxc: fix waiting for EDID to become available Date: Fri, 27 Nov 2020 12:23:15 +0300 Message-Id: <20201127092316.122246-1-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org - Call wake_up() when EDID ready event is received to wake wait_event_interruptible_timeout() - Increase waiting timeout, reading EDID can take longer than 100ms, so let's be on a safe side. - Return NULL pointer from get_edid() callback rather than ERR_PTR() pointer, as DRM code does NULL checks rather than IS_ERR(). Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c index 0c98d27f84ac..b708700e182d 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c @@ -145,8 +145,10 @@ static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id) lt9611uxc_unlock(lt9611uxc); - if (irq_status & BIT(0)) + if (irq_status & BIT(0)) { lt9611uxc->edid_read = !!(hpd_status & BIT(0)); + wake_up_all(<9611uxc->wq); + } if (irq_status & BIT(1)) { if (lt9611uxc->connector.dev) @@ -465,7 +467,7 @@ static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *brid static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc) { return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read, - msecs_to_jiffies(100)); + msecs_to_jiffies(500)); } static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len) @@ -503,7 +505,10 @@ static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge, ret = lt9611uxc_wait_for_edid(lt9611uxc); if (ret < 0) { dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret); - return ERR_PTR(ret); + return NULL; + } else if (ret == 0) { + dev_err(lt9611uxc->dev, "wait for EDID timeout\n"); + return NULL; } return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc); From patchwork Fri Nov 27 09:23:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 11935221 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 ADA99C64E75 for ; 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Fri, 27 Nov 2020 01:23:20 -0800 (PST) Received: from eriador.lumag.spb.ru ([188.162.64.79]) by smtp.gmail.com with ESMTPSA id a6sm615442lfi.107.2020.11.27.01.23.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Nov 2020 01:23:19 -0800 (PST) From: Dmitry Baryshkov To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org Cc: Daniel Vetter , David Airlie , Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Vinod Koul , Sam Ravnborg , Manivannan Sadhasivam Subject: [PATCH 2/2] drm/bridge/lontium-lt9611uxc: move HPD notification out of IRQ handler Date: Fri, 27 Nov 2020 12:23:16 +0300 Message-Id: <20201127092316.122246-2-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201127092316.122246-1-dmitry.baryshkov@linaro.org> References: <20201127092316.122246-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org drm hotplug handling code (drm_client_dev_hotplug()) can wait on mutex, thus delaying further lt9611uxc IRQ events processing. It was observed occasionally during bootups, when drm_client_modeset_probe() was waiting for EDID ready event, which was delayed because IRQ handler was stuck trying to deliver hotplug event. Move hotplug notifications from IRQ handler to separate work to be able to process IRQ events without delays. Signed-off-by: Dmitry Baryshkov Reviewed-by: Bjorn Andersson --- drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 30 +++++++++++++++++----- 1 file changed, 24 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c index b708700e182d..88630bc2921f 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c @@ -14,6 +14,7 @@ #include #include #include +#include #include @@ -36,6 +37,7 @@ struct lt9611uxc { struct mutex ocm_lock; struct wait_queue_head wq; + struct work_struct work; struct device_node *dsi0_node; struct device_node *dsi1_node; @@ -52,6 +54,7 @@ struct lt9611uxc { bool hpd_supported; bool edid_read; + bool hdmi_connected; uint8_t fw_version; }; @@ -151,15 +154,26 @@ static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id) } if (irq_status & BIT(1)) { - if (lt9611uxc->connector.dev) - drm_kms_helper_hotplug_event(lt9611uxc->connector.dev); - else - drm_bridge_hpd_notify(<9611uxc->bridge, !!(hpd_status & BIT(1))); + lt9611uxc->hdmi_connected = !!(hpd_status & BIT(1)); + schedule_work(<9611uxc->work); } return IRQ_HANDLED; } +void lt9611uxc_hpd_work(struct work_struct *work) +{ + struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work); + + if (lt9611uxc->connector.dev) + drm_kms_helper_hotplug_event(lt9611uxc->connector.dev); + else + drm_bridge_hpd_notify(<9611uxc->bridge, + lt9611uxc->hdmi_connected ? + connector_status_connected : + connector_status_disconnected); +} + static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc) { gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1); @@ -447,7 +461,7 @@ static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *brid struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge); unsigned int reg_val = 0; int ret; - int connected = 1; + bool connected = true; if (lt9611uxc->hpd_supported) { lt9611uxc_lock(lt9611uxc); @@ -457,8 +471,9 @@ static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *brid if (ret) dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret); else - connected = reg_val & BIT(1); + connected = !!(reg_val & BIT(1)); } + lt9611uxc->hdmi_connected = connected; return connected ? connector_status_connected : connector_status_disconnected; @@ -931,6 +946,8 @@ static int lt9611uxc_probe(struct i2c_client *client, lt9611uxc->fw_version = ret; init_waitqueue_head(<9611uxc->wq); + INIT_WORK(<9611uxc->work, lt9611uxc_hpd_work); + ret = devm_request_threaded_irq(dev, client->irq, NULL, lt9611uxc_irq_thread_handler, IRQF_ONESHOT, "lt9611uxc", lt9611uxc); @@ -967,6 +984,7 @@ static int lt9611uxc_remove(struct i2c_client *client) struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client); disable_irq(client->irq); + flush_scheduled_work(); lt9611uxc_audio_exit(lt9611uxc); drm_bridge_remove(<9611uxc->bridge);