From patchwork Wed Oct 26 12:06:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda X-Patchwork-Id: 619110 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 362F2C433FE for ; Wed, 26 Oct 2022 12:06:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233666AbiJZMGl (ORCPT ); Wed, 26 Oct 2022 08:06:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233652AbiJZMGh (ORCPT ); Wed, 26 Oct 2022 08:06:37 -0400 Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [IPv6:2a00:1450:4864:20::52b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 97931895DE for ; Wed, 26 Oct 2022 05:06:36 -0700 (PDT) Received: by mail-ed1-x52b.google.com with SMTP id a13so41138859edj.0 for ; Wed, 26 Oct 2022 05:06:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=Y3aLAqx1UmJhgGtzBHcHb9QyFZFPiOEXRjvNmq6X8fw=; b=edNMJTQ85mCASuHS8h6GXdQovCDGcQOiwkAINEAoQc7dobAkUSum7FUP0pj5QGoo/8 q97pUfK7BZ4E1QgE4/WH4axRkc2WK1fSO5yKYoet+fzVxfx93As7nA0IDrsex22+9r5u Uy5Fcto4Q4dxugJZYUUQeevzbFd9oY+7AqdtU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Y3aLAqx1UmJhgGtzBHcHb9QyFZFPiOEXRjvNmq6X8fw=; b=sEL8VGZ9Tch+rAoLt/ERjs4y7tljHSlmIopfAOFangma3jdUC2jozl5yoBMSYL15FS 5ZKkJqAST6tivrVTVSs0nWFMISXsDkvCsRRJ7s12H4fsREy/5FjD6cSNqRC0hS8iH0Xl gjQZEjimrAUq0cR05+m3D/UISoGnhiJIBaQ7l6u7insM0vHcLDLA/RO90Q3XwB+uQv7B UgaPVLB44SOZzsk2u4W8jCDX1mi8pn2FCP7B7byi/ZYrriFCVmGl++XLg+WS50oq/vSz 5X10KIvKvJgG8wb6vjG0GVca49FgJaaN4CiLzxeVG4KGqgi/b/QUmBQxGQFUrJ5gUN2X LzAw== X-Gm-Message-State: ACrzQf0u6AABHBJ7miSO4E3phEsJrW/VImwngUFHccBkD8UuxiZPTrmc UKLuo4x2TJKmgvsxu9yi8J5poQ== X-Google-Smtp-Source: AMsMyM5UOg1JMiWz7k0aqd85PLsiuGf7bdy7MmYF5Sio47TrLWMyrhddQLp6ZcBiOyI1/H6/ItlKOQ== X-Received: by 2002:a05:6402:414f:b0:456:c2c1:23ec with SMTP id x15-20020a056402414f00b00456c2c123ecmr41613747eda.420.1666785994930; Wed, 26 Oct 2022 05:06:34 -0700 (PDT) Received: from alco.roam.corp.google.com ([2620:0:1059:10:b47a:bedd:2941:1e3f]) by smtp.gmail.com with ESMTPSA id y18-20020a17090668d200b0079e11b8e891sm2892546ejr.125.2022.10.26.05.06.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Oct 2022 05:06:34 -0700 (PDT) From: Ricardo Ribalda Date: Wed, 26 Oct 2022 14:06:07 +0200 Subject: [PATCH v3 2/7] media: uvcvideo: Do power management granularly MIME-Version: 1.0 Message-Id: <20220920-resend-powersave-v3-2-c47856d8757e@chromium.org> References: <20220920-resend-powersave-v3-0-c47856d8757e@chromium.org> In-Reply-To: <20220920-resend-powersave-v3-0-c47856d8757e@chromium.org> To: Mauro Carvalho Chehab Cc: Tomasz Figa , Ricardo Ribalda , Guenter Roeck , Max Staudt , linux-kernel@vger.kernel.org, Alan Stern , Hans Verkuil , Laurent Pinchart , linux-media@vger.kernel.org X-Mailer: b4 0.11.0-dev-d93f8 X-Developer-Signature: v=1; a=openpgp-sha256; l=10240; i=ribalda@chromium.org; h=from:subject:message-id; bh=9JC+xKdhqfQ07Aja2WDiXvrtLcLtkT6rTXo67NjWgLI=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjWSK+e2m3BA+oc+r9uya55vadcNyhns4KU+wqqUKm jTbsZ/iJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY1kivgAKCRDRN9E+zzrEiJQ0D/ 93ifgleBrzC1Hwpo7lXAsu1p/qdaCm8+jyMElrtHrqmJsTPwKibAhbgC6C7tKcz0h8sL9CidluN2EZ wdS/fcl/uusZ0I9xmRvqN7JziD4opT9aNtsNj3/tNb5V0qULQtUpCMUFb/5D2T3iiP6a2QwKOucIfV 5wuUjJo7MVOjsjKOifljGvGeKAWPVZEIMjbFLtqNePTXQJrS9auVLQXp8CseFBvT93oRQq+xw0oMfR 958OFHRRGJ6IGsURsJGZzge4F9BXgqgwDpptE19odLYycPVzC0/Sp5gGzvwFS03tBGQnW0gCNMQ54c xaHqAwp63p7T33kN+07YpzAUfeFEFaQy2U4hiULs7qThA60OtEIND7u1zDLVKauC9pQrHjZyZgix9C Gr6PnuKaAMra6AFxA/+07iZQkvv5TWg26w6CvqH2ZrW/FhUtBGP0aKDdHUyntH35H24ITEbRNEH0D7 38S/XIqgWSKOlqInU/R299NfBMEb/N4QB36wBp4d8vYoc8YuLvTlHm9eA0PPVarUp6HSc88EWVQWfS zkYYL6tnWGs1a+LTlx82RZQ/fu9V1y6jw3ovUjLaYXFf5y514hPLWiT+EmzpI3S9qVatY84VafZHIG AfpkpE6cG3CC8D3qR73pWwLgBYGPBVBILSsYIL79BSLVAYz/SixM5P8oJtnw== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Instead of suspending/resume the USB device at open()/close(), do it when the device is actually used. This way we can reduce the power consumption when a service is holding the video device and leaving it in an idle state. Reviewed-by: Tomasz Figa Signed-off-by: Ricardo Ribalda diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 1389a87b8ae1..f5b0f1905962 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -25,6 +25,46 @@ #include "uvcvideo.h" +/* ------------------------------------------------------------------------ + * UVC power management + */ + +static int uvc_pm_get(struct uvc_streaming *stream) +{ + int ret; + + ret = usb_autopm_get_interface(stream->dev->intf); + if (ret) + return ret; + + mutex_lock(&stream->dev->lock); + if (!stream->dev->users) + ret = uvc_status_start(stream->dev, GFP_KERNEL); + if (!ret) + stream->dev->users++; + mutex_unlock(&stream->dev->lock); + + if (ret) + usb_autopm_put_interface(stream->dev->intf); + + return ret; +} + +static void uvc_pm_put(struct uvc_streaming *stream) +{ + mutex_lock(&stream->dev->lock); + if (WARN_ON(!stream->dev->users)) { + mutex_unlock(&stream->dev->lock); + return; + } + stream->dev->users--; + if (!stream->dev->users) + uvc_status_stop(stream->dev); + mutex_unlock(&stream->dev->lock); + + usb_autopm_put_interface(stream->dev->intf); +} + /* ------------------------------------------------------------------------ * UVC ioctls */ @@ -249,6 +289,9 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream, * developers test their webcams with the Linux driver as well as with * the Windows driver). */ + ret = uvc_pm_get(stream); + if (ret) + return ret; mutex_lock(&stream->mutex); if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS) probe->dwMaxVideoFrameSize = @@ -257,6 +300,7 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream, /* Probe the device. */ ret = uvc_probe_video(stream, probe); mutex_unlock(&stream->mutex); + uvc_pm_put(stream); if (ret < 0) return ret; @@ -468,7 +512,13 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream, } /* Probe the device with the new settings. */ + ret = uvc_pm_get(stream); + if (ret) { + mutex_unlock(&stream->mutex); + return ret; + } ret = uvc_probe_video(stream, &probe); + uvc_pm_put(stream); if (ret < 0) { mutex_unlock(&stream->mutex); return ret; @@ -559,36 +609,29 @@ static int uvc_v4l2_open(struct file *file) { struct uvc_streaming *stream; struct uvc_fh *handle; - int ret = 0; stream = video_drvdata(file); uvc_dbg(stream->dev, CALLS, "%s\n", __func__); - ret = usb_autopm_get_interface(stream->dev->intf); - if (ret < 0) - return ret; - /* Create the device handle. */ handle = kzalloc(sizeof(*handle), GFP_KERNEL); - if (handle == NULL) { - usb_autopm_put_interface(stream->dev->intf); + if (!handle) return -ENOMEM; - } - mutex_lock(&stream->dev->lock); - if (stream->dev->users == 0) { - ret = uvc_status_start(stream->dev, GFP_KERNEL); - if (ret < 0) { - mutex_unlock(&stream->dev->lock); - usb_autopm_put_interface(stream->dev->intf); + /* + * If the uvc evdev exists we cannot suspend when the device + * is idle. Otherwise we will miss button actions. + */ + if (stream->dev->input) { + int ret; + + ret = uvc_pm_get(stream); + if (ret) { kfree(handle); return ret; } } - stream->dev->users++; - mutex_unlock(&stream->dev->lock); - v4l2_fh_init(&handle->vfh, &stream->vdev); v4l2_fh_add(&handle->vfh); handle->chain = stream->chain; @@ -610,6 +653,12 @@ static int uvc_v4l2_release(struct file *file) if (uvc_has_privileges(handle)) uvc_queue_release(&stream->queue); + if (handle->is_streaming) + uvc_pm_put(stream); + + if (stream->dev->input) + uvc_pm_put(stream); + /* Release the file handle. */ uvc_dismiss_privileges(handle); v4l2_fh_del(&handle->vfh); @@ -617,12 +666,6 @@ static int uvc_v4l2_release(struct file *file) kfree(handle); file->private_data = NULL; - mutex_lock(&stream->dev->lock); - if (--stream->dev->users == 0) - uvc_status_stop(stream->dev); - mutex_unlock(&stream->dev->lock); - - usb_autopm_put_interface(stream->dev->intf); return 0; } @@ -849,9 +892,17 @@ static int uvc_ioctl_streamon(struct file *file, void *fh, if (handle->is_streaming) goto unlock; + + ret = uvc_pm_get(stream); + if (ret) + goto unlock; + ret = uvc_queue_streamon(&stream->queue, type); handle->is_streaming = !ret; + if (!handle->is_streaming) + uvc_pm_put(stream); + unlock: mutex_unlock(&stream->mutex); @@ -875,6 +926,9 @@ static int uvc_ioctl_streamoff(struct file *file, void *fh, ret = uvc_queue_streamoff(&stream->queue, type); handle->is_streaming = !!ret; + if (!handle->is_streaming) + uvc_pm_put(stream); + unlock: mutex_unlock(&stream->mutex); @@ -928,6 +982,7 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input) { struct uvc_fh *handle = fh; struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; u8 *buf; int ret; @@ -941,9 +996,16 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input) if (!buf) return -ENOMEM; + ret = uvc_pm_get(stream); + if (ret) { + kfree(buf); + return ret; + } + ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id, chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL, buf, 1); + uvc_pm_put(stream); if (!ret) *input = *buf - 1; @@ -956,6 +1018,7 @@ static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input) { struct uvc_fh *handle = fh; struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; u8 *buf; int ret; @@ -977,10 +1040,17 @@ static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input) if (!buf) return -ENOMEM; + ret = uvc_pm_get(stream); + if (ret) { + kfree(buf); + return ret; + } + *buf = input + 1; ret = uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id, chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL, buf, 1); + uvc_pm_put(stream); kfree(buf); return ret; @@ -991,8 +1061,15 @@ static int uvc_ioctl_queryctrl(struct file *file, void *fh, { struct uvc_fh *handle = fh; struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; + int ret; - return uvc_query_v4l2_ctrl(chain, qc); + ret = uvc_pm_get(stream); + if (ret) + return ret; + ret = uvc_query_v4l2_ctrl(chain, qc); + uvc_pm_put(stream); + return ret; } static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh, @@ -1000,10 +1077,15 @@ static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh, { struct uvc_fh *handle = fh; struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; struct v4l2_queryctrl qc = { qec->id }; int ret; + ret = uvc_pm_get(stream); + if (ret) + return ret; ret = uvc_query_v4l2_ctrl(chain, &qc); + uvc_pm_put(stream); if (ret) return ret; @@ -1049,6 +1131,7 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh, { struct uvc_fh *handle = fh; struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; struct v4l2_ext_control *ctrl = ctrls->controls; unsigned int i; int ret; @@ -1073,22 +1156,30 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh, return 0; } + ret = uvc_pm_get(stream); + if (ret) + return ret; ret = uvc_ctrl_begin(chain); - if (ret < 0) + if (ret < 0) { + uvc_pm_put(stream); return ret; + } for (i = 0; i < ctrls->count; ++ctrl, ++i) { ret = uvc_ctrl_get(chain, ctrl); if (ret < 0) { uvc_ctrl_rollback(handle); ctrls->error_idx = i; - return ret; + goto done; } } ctrls->error_idx = 0; - return uvc_ctrl_rollback(handle); + ret = uvc_ctrl_rollback(handle); +done: + uvc_pm_put(stream); + return ret; } static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle, @@ -1097,6 +1188,7 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle, { struct v4l2_ext_control *ctrl = ctrls->controls; struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; unsigned int i; int ret; @@ -1104,9 +1196,15 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle, if (ret < 0) return ret; + ret = uvc_pm_get(stream); + if (ret) + return ret; + ret = uvc_ctrl_begin(chain); - if (ret < 0) + if (ret < 0) { + uvc_pm_put(stream); return ret; + } for (i = 0; i < ctrls->count; ++ctrl, ++i) { ret = uvc_ctrl_set(handle, ctrl); @@ -1114,16 +1212,20 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle, uvc_ctrl_rollback(handle); ctrls->error_idx = ioctl == VIDIOC_S_EXT_CTRLS ? ctrls->count : i; - return ret; + goto done; } } ctrls->error_idx = 0; if (ioctl == VIDIOC_S_EXT_CTRLS) - return uvc_ctrl_commit(handle, ctrls); + ret = uvc_ctrl_commit(handle, ctrls); else - return uvc_ctrl_rollback(handle); + ret = uvc_ctrl_rollback(handle); + +done: + uvc_pm_put(stream); + return ret; } static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh, @@ -1147,8 +1249,16 @@ static int uvc_ioctl_querymenu(struct file *file, void *fh, { struct uvc_fh *handle = fh; struct uvc_video_chain *chain = handle->chain; + struct uvc_streaming *stream = handle->stream; + int ret; + + ret = uvc_pm_get(stream); + if (ret) + return ret; + ret = uvc_query_v4l2_menu(chain, qm); + uvc_pm_put(stream); - return uvc_query_v4l2_menu(chain, qm); + return ret; } static int uvc_ioctl_g_selection(struct file *file, void *fh,