From patchwork Tue Jun 21 18:18:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: cpaul@redhat.com X-Patchwork-Id: 9191211 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3A7F8601C0 for ; Tue, 21 Jun 2016 18:18:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2CD0028319 for ; Tue, 21 Jun 2016 18:18:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1F93228329; Tue, 21 Jun 2016 18:18:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5749328319 for ; Tue, 21 Jun 2016 18:18:51 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2FBD06E2CD; Tue, 21 Jun 2016 18:18:48 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id 85F146E2CD; Tue, 21 Jun 2016 18:18:46 +0000 (UTC) Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E06AC46266; Tue, 21 Jun 2016 18:18:45 +0000 (UTC) Received: from ecstaticemu.bos.redhat.com (dhcp-25-142.bos.redhat.com [10.18.25.142]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u5LIIifB018888; Tue, 21 Jun 2016 14:18:44 -0400 From: Lyude To: Daniel Vetter , intel-gfx@lists.freedesktop.org Subject: [PATCH v4 4/4] drm/i915: Enable polling when we don't have hpd Date: Tue, 21 Jun 2016 14:18:35 -0400 Message-Id: <1466533115-3029-1-git-send-email-cpaul@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Tue, 21 Jun 2016 18:18:46 +0000 (UTC) Cc: "open list:INTEL DRM DRIVERS excluding Poulsbo, Moorestow..., linux-kernel@vger.kernel.org open list" , stable@vger.kernel.org, Daniel Vetter , Lyude X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Unfortunately, there's two situations where we lose hpd right now: - Runtime suspend - When we've shut off all of the power wells on Valleyview/Cherryview While it would be nice if this didn't cause issues, this has the ability to get us in some awkward states where a user won't be able to get their display to turn on. For instance; if we boot a Valleyview system without any monitors connected, it won't need any of it's power wells and thus shut them off. Since this causes us to lose HPD, this means that unless the user knows how to ssh into their machine and do a manual reprobe for monitors, none of the monitors they connect after booting will actually work. Eventually we should come up with a better fix then having to enable polling for this, since this makes rpm a lot less useful, but for now the infrastructure in i915 just isn't there yet to get hpd in these situations. Changes since v1: - Add comment explaining the addition of the if (!mode_config->poll_running) in intel_hpd_init() - Remove unneeded if (!dev->mode_config.poll_enabled) in i915_hpd_poll_init_work() - Call to drm_helper_hpd_irq_event() after we disable polling - Add cancel_work_sync() call to intel_hpd_cancel_work() Changes since v2: - Apparently dev->mode_config.poll_running doesn't actually reflect whether or not a poll is currently in progress, and is actually used for dynamic module paramter enabling/disabling. So now we instead keep track of our own poll_running variable in dev_priv->hotplug - Clean i915_hpd_poll_init_work() a little bit Changes since v3: - Remove the now-redundant connector loop in intel_hpd_init(), just rely on intel_hpd_poll_enable() for setting connector->polled correctly on each connector - Get rid of poll_running - Don't assign enabled in i915_hpd_poll_init_work before we actually lock dev->mode_config.mutex - Wrap enabled assignment in i915_hpd_poll_init_work() in READ_ONCE() for doc purposes - Do the same for dev_priv->hotplug.poll_enabled with WRITE_ONCE in intel_hpd_poll_enable() - Add some comments about racing not mattering in intel_hpd_poll_enable Cc: stable@vger.kernel.org Cc: Ville Syrjälä Cc: Daniel Vetter Signed-off-by: Lyude --- drivers/gpu/drm/i915/i915_drv.c | 7 ++- drivers/gpu/drm/i915/i915_drv.h | 3 ++ drivers/gpu/drm/i915/intel_drv.h | 2 + drivers/gpu/drm/i915/intel_hotplug.c | 76 ++++++++++++++++++++++++++------- drivers/gpu/drm/i915/intel_runtime_pm.c | 3 ++ 5 files changed, 75 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 3eb47fb..5381d9e 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1612,6 +1612,9 @@ static int intel_runtime_suspend(struct device *device) assert_forcewakes_inactive(dev_priv); + if (!IS_VALLEYVIEW(dev_priv) || !IS_CHERRYVIEW(dev_priv)) + intel_hpd_poll_enable(dev_priv, true); + DRM_DEBUG_KMS("Device suspended\n"); return 0; } @@ -1667,8 +1670,10 @@ static int intel_runtime_resume(struct device *device) * power well, so hpd is reinitialized from there. For * everyone else do it here. */ - if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) + if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv)) { intel_hpd_init(dev_priv); + intel_hpd_poll_enable(dev_priv, false); + } intel_enable_gt_powersave(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 239a3ec..944c0d0 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -283,6 +283,9 @@ struct i915_hotplug { u32 short_port_mask; struct work_struct dig_port_work; + struct work_struct poll_enable_work; + bool poll_enabled; + /* * if we get a HPD irq from DP and a HPD irq from non-DP * the non-DP HPD could block the workqueue on a mode config diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index dcbfdde..cedac13 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1385,6 +1385,8 @@ int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector); /* intel_dvo.c */ void intel_dvo_init(struct drm_device *dev); +/* intel_hotplug.c */ +void intel_hpd_poll_enable(struct drm_i915_private *dev_priv, bool enabled); /* legacy fbdev emulation in intel_fbdev.c */ diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c index ec3285f..f23330d 100644 --- a/drivers/gpu/drm/i915/intel_hotplug.c +++ b/drivers/gpu/drm/i915/intel_hotplug.c @@ -455,28 +455,14 @@ void intel_hpd_irq_handler(struct drm_i915_private *dev_priv, */ void intel_hpd_init(struct drm_i915_private *dev_priv) { - struct drm_device *dev = dev_priv->dev; - struct drm_mode_config *mode_config = &dev->mode_config; - struct drm_connector *connector; int i; for_each_hpd_pin(i) { dev_priv->hotplug.stats[i].count = 0; dev_priv->hotplug.stats[i].state = HPD_ENABLED; } - list_for_each_entry(connector, &mode_config->connector_list, head) { - struct intel_connector *intel_connector = to_intel_connector(connector); - connector->polled = intel_connector->polled; - /* MST has a dynamic intel_connector->encoder and it's reprobing - * is all handled by the MST helpers. */ - if (intel_connector->mst_port) - continue; - - if (!connector->polled && I915_HAS_HOTPLUG(dev) && - intel_connector->encoder->hpd_pin > HPD_NONE) - connector->polled = DRM_CONNECTOR_POLL_HPD; - } + intel_hpd_poll_enable(dev_priv, false); /* * Interrupt setup is already guaranteed to be single-threaded, this is @@ -488,10 +474,69 @@ void intel_hpd_init(struct drm_i915_private *dev_priv) spin_unlock_irq(&dev_priv->irq_lock); } +void i915_hpd_poll_init_work(struct work_struct *work) { + struct drm_i915_private *dev_priv = + container_of(work, struct drm_i915_private, + hotplug.poll_enable_work); + struct drm_device *dev = dev_priv->dev; + struct intel_connector *intel_connector; + bool enabled; + + mutex_lock(&dev->mode_config.mutex); + + enabled = READ_ONCE(dev_priv->hotplug.poll_enabled); + + for_each_intel_connector(dev, intel_connector) { + struct drm_connector *connector = &intel_connector->base; + + if (enabled) { + connector->polled = DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT; + } else { + connector->polled = intel_connector->polled; + + /* MST has a dynamic intel_connector->encoder and it's + * reprobing is all handled by the MST helpers. */ + if (intel_connector->mst_port) + continue; + + if (!connector->polled && I915_HAS_HOTPLUG(dev) && + intel_connector->encoder->hpd_pin > HPD_NONE) + connector->polled = DRM_CONNECTOR_POLL_HPD; + } + } + + if (enabled) + drm_kms_helper_poll_enable_locked(dev); + + mutex_unlock(&dev->mode_config.mutex); + + /* + * We might have missed any hotplugs that happened while we were + * in the middle of disabling polling + */ + if (!enabled) + drm_helper_hpd_irq_event(dev); +} + +void intel_hpd_poll_enable(struct drm_i915_private *dev_priv, bool enabled) +{ + WRITE_ONCE(dev_priv->hotplug.poll_enabled, enabled); + + /* + * We might already be holding dev->mode_config.mutex, so do this in a + * seperate worker + * As well, there's no issue if we race here since we always reschedule + * this worker anyway + */ + schedule_work(&dev_priv->hotplug.poll_enable_work); +} + void intel_hpd_init_work(struct drm_i915_private *dev_priv) { INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func); INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func); + INIT_WORK(&dev_priv->hotplug.poll_enable_work, i915_hpd_poll_init_work); INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work, intel_hpd_irq_storm_reenable_work); } @@ -508,6 +553,7 @@ void intel_hpd_cancel_work(struct drm_i915_private *dev_priv) cancel_work_sync(&dev_priv->hotplug.dig_port_work); cancel_work_sync(&dev_priv->hotplug.hotplug_work); + cancel_work_sync(&dev_priv->hotplug.poll_enable_work); cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work); } diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index f88ef76..b0e9395 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -1099,6 +1099,7 @@ static void vlv_display_power_well_init(struct drm_i915_private *dev_priv) if (dev_priv->power_domains.initializing) return; + intel_hpd_poll_enable(dev_priv, false); intel_hpd_init(dev_priv); /* Re-enable the ADPA, if we have one */ @@ -1120,6 +1121,8 @@ static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv) synchronize_irq(dev_priv->dev->irq); vlv_power_sequencer_reset(dev_priv); + + intel_hpd_poll_enable(dev_priv, true); } static void vlv_display_power_well_enable(struct drm_i915_private *dev_priv,