From patchwork Thu Jul 21 07:41:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 592306 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 67706C43334 for ; Thu, 21 Jul 2022 07:41:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230140AbiGUHlo (ORCPT ); Thu, 21 Jul 2022 03:41:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229712AbiGUHlo (ORCPT ); Thu, 21 Jul 2022 03:41:44 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 943776A9C6 for ; Thu, 21 Jul 2022 00:41:42 -0700 (PDT) Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 55739496; Thu, 21 Jul 2022 09:41:40 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1658389300; bh=ZO3fpCf313vXqbNPU/o060BNjvSWM7BZHqZQtTjeB9E=; h=From:To:Cc:Subject:Date:From; b=UGruBATLYWJH8LNU1OChqxckIWam2dgHB5OftAkwZv7jpROAkfNQ+tXW+eDhsThfN tlEP4zODeHKB2C5nHqIcibxxiWnGvWkcuJPkgUfPpWwZAQkjxp7pqyiL6iypOsjuiA l+Ws8IBJbPaHwuZb5CZUftWUyEf2o4v8A81Kg33A= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: Steve Longerbeam , Paul Elder , Sakari Ailus Subject: [PATCH] media: ov5640: Use runtime PM Date: Thu, 21 Jul 2022 10:41:38 +0300 Message-Id: <20220721074138.8653-1-laurent.pinchart@ideasonboard.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Paul Elder Switch to using runtime PM for power management. Make it optional, however, to support ACPI. Signed-off-by: Paul Elder Reviewed-by: Laurent Pinchart --- Changes since v6: - Rebase on top of latest media tree master branch Changes in v6: - remove dependency on pm_runtime (to support ACPI) Changes in v5: - fix compilation warning Changes in v4: - replace pm_runtime_put* with pm_runtime_put_autosuspend - remove the manual initial call to ov5640_set_power() Changes in v3: - Move v4l2_ctrl_handler_setup() from ov5640_sensor_resume to ov5640_s_stream() Changes in v2: - replace manual tracking of power status with pm_runtime_get_if_in_use - power on the sensor before reading the checking the chip id - add dependency on PM to Kconfig --- drivers/media/i2c/ov5640.c | 133 ++++++++++++++++++++++--------------- 1 file changed, 81 insertions(+), 52 deletions(-) diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c index 502f0b62e950..94db427e21de 100644 --- a/drivers/media/i2c/ov5640.c +++ b/drivers/media/i2c/ov5640.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -447,8 +448,6 @@ struct ov5640_dev { /* lock to protect all members below */ struct mutex lock; - int power_count; - struct v4l2_mbus_framefmt fmt; bool pending_fmt_change; @@ -2696,39 +2695,24 @@ static int ov5640_set_power(struct ov5640_dev *sensor, bool on) return ret; } +static int ov5640_sensor_suspend(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov5640_dev *ov5640 = to_ov5640_dev(sd); + + return ov5640_set_power(ov5640, false); +} + +static int ov5640_sensor_resume(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov5640_dev *ov5640 = to_ov5640_dev(sd); + + return ov5640_set_power(ov5640, true); +} + /* --------------- Subdev Operations --------------- */ -static int ov5640_s_power(struct v4l2_subdev *sd, int on) -{ - struct ov5640_dev *sensor = to_ov5640_dev(sd); - int ret = 0; - - mutex_lock(&sensor->lock); - - /* - * If the power count is modified from 0 to != 0 or from != 0 to 0, - * update the power state. - */ - if (sensor->power_count == !on) { - ret = ov5640_set_power(sensor, !!on); - if (ret) - goto out; - } - - /* Update the power count. */ - sensor->power_count += on ? 1 : -1; - WARN_ON(sensor->power_count < 0); -out: - mutex_unlock(&sensor->lock); - - if (on && !ret && sensor->power_count == 1) { - /* restore controls */ - ret = v4l2_ctrl_handler_setup(&sensor->ctrls.handler); - } - - return ret; -} - static int ov5640_try_frame_interval(struct ov5640_dev *sensor, struct v4l2_fract *fi, u32 width, u32 height) @@ -3314,6 +3298,9 @@ static int ov5640_g_volatile_ctrl(struct v4l2_ctrl *ctrl) /* v4l2_ctrl_lock() locks our own mutex */ + if (!pm_runtime_get_if_in_use(&sensor->i2c_client->dev)) + return 0; + switch (ctrl->id) { case V4L2_CID_AUTOGAIN: val = ov5640_get_gain(sensor); @@ -3329,6 +3316,8 @@ static int ov5640_g_volatile_ctrl(struct v4l2_ctrl *ctrl) break; } + pm_runtime_put_autosuspend(&sensor->i2c_client->dev); + return 0; } @@ -3358,9 +3347,9 @@ static int ov5640_s_ctrl(struct v4l2_ctrl *ctrl) /* * If the device is not powered up by the host driver do * not apply any controls to H/W at this time. Instead - * the controls will be restored right after power-up. + * the controls will be restored at start streaming time. */ - if (sensor->power_count == 0) + if (!pm_runtime_get_if_in_use(&sensor->i2c_client->dev)) return 0; switch (ctrl->id) { @@ -3402,6 +3391,8 @@ static int ov5640_s_ctrl(struct v4l2_ctrl *ctrl) break; } + pm_runtime_put_autosuspend(&sensor->i2c_client->dev); + return ret; } @@ -3677,6 +3668,18 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable) struct ov5640_dev *sensor = to_ov5640_dev(sd); int ret = 0; + if (enable) { + ret = pm_runtime_resume_and_get(&sensor->i2c_client->dev); + if (ret < 0) + return ret; + + ret = v4l2_ctrl_handler_setup(&sensor->ctrls.handler); + if (ret) { + pm_runtime_put(&sensor->i2c_client->dev); + return ret; + } + } + mutex_lock(&sensor->lock); if (sensor->streaming == !enable) { @@ -3701,8 +3704,13 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable) if (!ret) sensor->streaming = enable; } + out: mutex_unlock(&sensor->lock); + + if (!enable || ret) + pm_runtime_put_autosuspend(&sensor->i2c_client->dev); + return ret; } @@ -3724,7 +3732,6 @@ static int ov5640_init_cfg(struct v4l2_subdev *sd, } static const struct v4l2_subdev_core_ops ov5640_core_ops = { - .s_power = ov5640_s_power, .log_status = v4l2_ctrl_subdev_log_status, .subscribe_event = v4l2_ctrl_subdev_subscribe_event, .unsubscribe_event = v4l2_event_subdev_unsubscribe, @@ -3770,26 +3777,20 @@ static int ov5640_check_chip_id(struct ov5640_dev *sensor) int ret = 0; u16 chip_id; - ret = ov5640_set_power_on(sensor); - if (ret) - return ret; - ret = ov5640_read_reg16(sensor, OV5640_REG_CHIP_ID, &chip_id); if (ret) { dev_err(&client->dev, "%s: failed to read chip identifier\n", __func__); - goto power_off; + return ret; } if (chip_id != 0x5640) { dev_err(&client->dev, "%s: wrong chip identifier, expected 0x5640, got 0x%x\n", __func__, chip_id); - ret = -ENXIO; + return -ENXIO; } -power_off: - ov5640_set_power_off(sensor); - return ret; + return 0; } static int ov5640_probe(struct i2c_client *client) @@ -3880,26 +3881,43 @@ static int ov5640_probe(struct i2c_client *client) ret = ov5640_get_regulators(sensor); if (ret) - return ret; + goto entity_cleanup; mutex_init(&sensor->lock); - ret = ov5640_check_chip_id(sensor); - if (ret) - goto entity_cleanup; - ret = ov5640_init_controls(sensor); if (ret) goto entity_cleanup; + ret = ov5640_sensor_resume(dev); + if (ret) { + dev_err(dev, "failed to power on\n"); + goto entity_cleanup; + } + + pm_runtime_set_active(dev); + pm_runtime_get_noresume(dev); + pm_runtime_enable(dev); + + ret = ov5640_check_chip_id(sensor); + if (ret) + goto err_pm_runtime; + ret = v4l2_async_register_subdev_sensor(&sensor->sd); if (ret) - goto free_ctrls; + goto err_pm_runtime; + + pm_runtime_set_autosuspend_delay(dev, 1000); + pm_runtime_use_autosuspend(dev); + pm_runtime_put_autosuspend(dev); return 0; -free_ctrls: +err_pm_runtime: + pm_runtime_put_noidle(dev); + pm_runtime_disable(dev); v4l2_ctrl_handler_free(&sensor->ctrls.handler); + ov5640_sensor_suspend(dev); entity_cleanup: media_entity_cleanup(&sensor->sd.entity); mutex_destroy(&sensor->lock); @@ -3910,6 +3928,12 @@ static int ov5640_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); struct ov5640_dev *sensor = to_ov5640_dev(sd); + struct device *dev = &client->dev; + + pm_runtime_disable(dev); + if (!pm_runtime_status_suspended(dev)) + ov5640_sensor_suspend(dev); + pm_runtime_set_suspended(dev); v4l2_async_unregister_subdev(&sensor->sd); media_entity_cleanup(&sensor->sd.entity); @@ -3919,6 +3943,10 @@ static int ov5640_remove(struct i2c_client *client) return 0; } +static const struct dev_pm_ops ov5640_pm_ops = { + SET_RUNTIME_PM_OPS(ov5640_sensor_suspend, ov5640_sensor_resume, NULL) +}; + static const struct i2c_device_id ov5640_id[] = { {"ov5640", 0}, {}, @@ -3935,6 +3963,7 @@ static struct i2c_driver ov5640_i2c_driver = { .driver = { .name = "ov5640", .of_match_table = ov5640_dt_ids, + .pm = &ov5640_pm_ops, }, .id_table = ov5640_id, .probe_new = ov5640_probe,