Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753966AbdFOSHn (ORCPT ); Thu, 15 Jun 2017 14:07:43 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:55086 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753786AbdFOSAG (ORCPT ); Thu, 15 Jun 2017 14:00:06 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hans de Goede , Sasha Levin Subject: [PATCH 4.9 059/108] drm/nouveau: Intercept ACPI_VIDEO_NOTIFY_PROBE Date: Thu, 15 Jun 2017 19:53:05 +0200 Message-Id: <20170615175339.992569615@linuxfoundation.org> X-Mailer: git-send-email 2.13.1 In-Reply-To: <20170615175337.190782107@linuxfoundation.org> References: <20170615175337.190782107@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4895 Lines: 158 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hans de Goede [ Upstream commit 3a6536c51d5db3adf58dcd466a3aee6233b58544 ] Various notebooks with nvidia GPUs generate an ACPI_VIDEO_NOTIFY_PROBE acpi-video event when an external device gets plugged in (and again on modesets on that connector), the default behavior in the acpi-video driver for this is to send a KEY_SWITCHVIDEOMODE evdev event, which causes e.g. gnome-settings-daemon to ask us to rescan the connectors (good), but also causes g-s-d to switch to mirror mode on a newly plugged monitor rather then using the monitor to extend the desktop (bad) as KEY_SWITCHVIDEOMODE is supposed to switch between extend the desktop vs mirror mode. More troublesome are the repeated ACPI_VIDEO_NOTIFY_PROBE events on changing the mode on the connector, which cause g-s-d to switch between mirror/extend mode, which causes a new ACPI_VIDEO_NOTIFY_PROBE event and we end up with an endless loop. This commit fixes this by adding an acpi notifier block handler to nouveau_display.c to intercept ACPI_VIDEO_NOTIFY_PROBE and: 1) Wake-up runtime suspended GPUs and call drm_helper_hpd_irq_event() on them, this is necessary in some cases for the GPU to detect connector hotplug events while runtime suspended 2) Return NOTIFY_BAD to stop acpi-video from emitting a bogus KEY_SWITCHVIDEOMODE key-press event There already is another acpi notifier block handler registered in drivers/gpu/drm/nouveau/nvkm/engine/device/acpi.c, but that is not suitable since that one gets unregistered on runtime suspend, and we also want to intercept ACPI_VIDEO_NOTIFY_PROBE when runtime suspended. Signed-off-by: Hans de Goede Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/nouveau/nouveau_display.c | 59 ++++++++++++++++++++++++++++++ drivers/gpu/drm/nouveau/nouveau_drv.h | 6 +++ 2 files changed, 65 insertions(+) --- a/drivers/gpu/drm/nouveau/nouveau_display.c +++ b/drivers/gpu/drm/nouveau/nouveau_display.c @@ -24,6 +24,7 @@ * */ +#include #include #include @@ -358,6 +359,55 @@ static struct nouveau_drm_prop_enum_list } \ } while(0) +#ifdef CONFIG_ACPI + +/* + * Hans de Goede: This define belongs in acpi/video.h, I've submitted a patch + * to the acpi subsys to move it there from drivers/acpi/acpi_video.c . + * This should be dropped once that is merged. + */ +#ifndef ACPI_VIDEO_NOTIFY_PROBE +#define ACPI_VIDEO_NOTIFY_PROBE 0x81 +#endif + +static void +nouveau_display_acpi_work(struct work_struct *work) +{ + struct nouveau_drm *drm = container_of(work, typeof(*drm), acpi_work); + + pm_runtime_get_sync(drm->dev->dev); + + drm_helper_hpd_irq_event(drm->dev); + + pm_runtime_mark_last_busy(drm->dev->dev); + pm_runtime_put_sync(drm->dev->dev); +} + +static int +nouveau_display_acpi_ntfy(struct notifier_block *nb, unsigned long val, + void *data) +{ + struct nouveau_drm *drm = container_of(nb, typeof(*drm), acpi_nb); + struct acpi_bus_event *info = data; + + if (!strcmp(info->device_class, ACPI_VIDEO_CLASS)) { + if (info->type == ACPI_VIDEO_NOTIFY_PROBE) { + /* + * This may be the only indication we receive of a + * connector hotplug on a runtime suspended GPU, + * schedule acpi_work to check. + */ + schedule_work(&drm->acpi_work); + + /* acpi-video should not generate keypresses for this */ + return NOTIFY_BAD; + } + } + + return NOTIFY_DONE; +} +#endif + int nouveau_display_init(struct drm_device *dev) { @@ -537,6 +587,12 @@ nouveau_display_create(struct drm_device } nouveau_backlight_init(dev); +#ifdef CONFIG_ACPI + INIT_WORK(&drm->acpi_work, nouveau_display_acpi_work); + drm->acpi_nb.notifier_call = nouveau_display_acpi_ntfy; + register_acpi_notifier(&drm->acpi_nb); +#endif + return 0; vblank_err: @@ -552,6 +608,9 @@ nouveau_display_destroy(struct drm_devic { struct nouveau_display *disp = nouveau_display(dev); +#ifdef CONFIG_ACPI + unregister_acpi_notifier(&nouveau_drm(dev)->acpi_nb); +#endif nouveau_backlight_exit(dev); nouveau_display_vblank_fini(dev); --- a/drivers/gpu/drm/nouveau/nouveau_drv.h +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h @@ -37,6 +37,8 @@ * - implemented limited ABI16/NVIF interop */ +#include + #include #include #include @@ -161,6 +163,10 @@ struct nouveau_drm { struct nvbios vbios; struct nouveau_display *display; struct backlight_device *backlight; +#ifdef CONFIG_ACPI + struct notifier_block acpi_nb; + struct work_struct acpi_work; +#endif /* power management */ struct nouveau_hwmon *hwmon;