From: Chanwoo Choi <cwchoi00@gmail.com>
To: Dong Aisheng <aisheng.dong@nxp.com>,
linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: dongas86@gmail.com, kernel@pengutronix.de, shawnguo@kernel.org,
linux-imx@nxp.com, linux-kernel@vger.kernel.org,
myungjoo.ham@samsung.com, kyungmin.park@samsung.com,
cw00.choi@samsung.com, abel.vesa@nxp.com
Subject: Re: [PATCH 07/11] PM / devfreq: check get_dev_status before start monitor
Date: Wed, 10 Mar 2021 00:58:37 +0900 [thread overview]
Message-ID: <de25cd22-7f17-5902-21d3-881e3128dd31@gmail.com> (raw)
In-Reply-To: <1615294733-22761-8-git-send-email-aisheng.dong@nxp.com>
On 21. 3. 9. 오후 9:58, Dong Aisheng wrote:
> The devfreq monitor depends on the device to provide load information
> by .get_dev_status() to calculate the next target freq.
>
> And this will cause changing governor to simple ondemand fail
> if device can't support.
>
> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
> ---
> drivers/devfreq/devfreq.c | 10 +++++++---
> drivers/devfreq/governor.h | 2 +-
> drivers/devfreq/governor_simpleondemand.c | 3 +--
> 3 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 7231fe6862a2..d1787b6c7d7c 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -482,10 +482,13 @@ static void devfreq_monitor(struct work_struct *work)
> * to be called from governor in response to DEVFREQ_GOV_START
> * event when device is added to devfreq framework.
> */
> -void devfreq_monitor_start(struct devfreq *devfreq)
> +int devfreq_monitor_start(struct devfreq *devfreq)
> {
> if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN))
> - return;
> + return 0;
> +
> + if (!devfreq->profile->get_dev_status)
> + return -EINVAL;
>
> switch (devfreq->profile->timer) {
> case DEVFREQ_TIMER_DEFERRABLE:
> @@ -495,12 +498,13 @@ void devfreq_monitor_start(struct devfreq *devfreq)
> INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor);
> break;
> default:
> - return;
> + return -EINVAL;
> }
>
> if (devfreq->profile->polling_ms)
> queue_delayed_work(devfreq_wq, &devfreq->work,
> msecs_to_jiffies(devfreq->profile->polling_ms));
> + return 0;
> }
> EXPORT_SYMBOL(devfreq_monitor_start);
>
> diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
> index 5cee3f64fe2b..31af6d072a10 100644
> --- a/drivers/devfreq/governor.h
> +++ b/drivers/devfreq/governor.h
> @@ -75,7 +75,7 @@ struct devfreq_governor {
> unsigned int event, void *data);
> };
>
> -void devfreq_monitor_start(struct devfreq *devfreq);
> +int devfreq_monitor_start(struct devfreq *devfreq);
> void devfreq_monitor_stop(struct devfreq *devfreq);
> void devfreq_monitor_suspend(struct devfreq *devfreq);
> void devfreq_monitor_resume(struct devfreq *devfreq);
> diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
> index d57b82a2b570..ea287b57cbf3 100644
> --- a/drivers/devfreq/governor_simpleondemand.c
> +++ b/drivers/devfreq/governor_simpleondemand.c
> @@ -89,8 +89,7 @@ static int devfreq_simple_ondemand_handler(struct devfreq *devfreq,
> {
> switch (event) {
> case DEVFREQ_GOV_START:
> - devfreq_monitor_start(devfreq);
> - break;
> + return devfreq_monitor_start(devfreq);
>
> case DEVFREQ_GOV_STOP:
> devfreq_monitor_stop(devfreq);
>
Need to handle the all points of devfreq_monitor_start() usage.
please check the tegra30-devfreq.c for this update.
$ grep -rn "devfreq_monitor_start" drivers/
drivers/devfreq/governor_simpleondemand.c:92:
devfreq_monitor_start(devfreq);
drivers/devfreq/tegra30-devfreq.c:744: devfreq_monitor_start(devfreq);
......
--
Best Regards,
Samsung Electronics
Chanwoo Choi
next prev parent reply other threads:[~2021-03-09 15:59 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-09 12:58 [PATCH 00/11] PM / devfreq: a few small fixes and improvements Dong Aisheng
2021-03-09 12:58 ` [PATCH 01/11] doc: ABI: devfreq: remove invalid central_polling description Dong Aisheng
2021-03-09 15:01 ` Chanwoo Choi
2021-03-09 12:58 ` [PATCH 02/11] PM / devfreq: remove the invalid description for get_target_freq Dong Aisheng
2021-03-09 15:02 ` Chanwoo Choi
2021-03-09 15:14 ` Dong Aisheng
2021-03-09 12:58 ` [PATCH 03/11] PM / devfreq: fix the wrong set_freq path for userspace governor Dong Aisheng
2021-03-09 15:13 ` Chanwoo Choi
2021-03-09 15:16 ` Dong Aisheng
2021-03-09 12:58 ` [PATCH 04/11] PM / devfreq: bail out early if no freq changes in devfreq_set_target Dong Aisheng
2021-03-09 15:47 ` Chanwoo Choi
2021-03-10 2:42 ` Dong Aisheng
2021-03-09 12:58 ` [PATCH 05/11] PM / devfreq: use more accurate returned new_freq as resume_freq Dong Aisheng
2021-03-09 15:53 ` Chanwoo Choi
2021-03-10 2:43 ` Dong Aisheng
2021-03-10 3:07 ` Chanwoo Choi
2021-03-10 3:04 ` Dong Aisheng
2021-03-09 12:58 ` [PATCH 06/11] PM / devfreq: drop the unnecessary low variable initialization Dong Aisheng
2021-03-09 12:58 ` [PATCH 07/11] PM / devfreq: check get_dev_status before start monitor Dong Aisheng
2021-03-09 15:58 ` Chanwoo Choi [this message]
2021-03-09 16:12 ` Chanwoo Choi
2021-03-10 2:56 ` Dong Aisheng
2021-03-10 3:25 ` Chanwoo Choi
2021-03-10 4:56 ` Dong Aisheng
2021-03-11 7:10 ` Chanwoo Choi
2021-03-12 10:57 ` Dong Aisheng
2021-03-12 16:09 ` Chanwoo Choi
2021-03-13 6:45 ` Dong Aisheng
2021-03-18 8:03 ` Dong Aisheng
2021-03-18 9:54 ` Chanwoo Choi
2021-03-18 9:59 ` Chanwoo Choi
2021-03-18 10:51 ` Dong Aisheng
2021-03-10 2:51 ` Dong Aisheng
2021-03-09 12:58 ` [PATCH 08/11] PM / devfreq: check get_dev_status in devfreq_update_stats Dong Aisheng
2021-03-09 16:02 ` Chanwoo Choi
2021-03-09 16:20 ` Chanwoo Choi
2021-03-10 3:00 ` Dong Aisheng
2021-03-11 7:01 ` Chanwoo Choi
2021-03-09 12:58 ` [PATCH 09/11] PM / devfreq: governor: optimize simpleondemand get_target_freq Dong Aisheng
2021-03-09 16:09 ` Chanwoo Choi
2021-03-10 3:02 ` Dong Aisheng
2021-03-09 12:58 ` [PATCH 10/11] PM / devfreq: imx8m-ddrc: remove imx8m_ddrc_get_dev_status Dong Aisheng
2021-03-09 16:22 ` Chanwoo Choi
2021-03-09 12:58 ` [PATCH 11/11] PM / devfreq: imx8m-ddrc: drop polling_ms Dong Aisheng
2021-03-09 16:23 ` Chanwoo Choi
2021-03-10 3:03 ` Dong Aisheng
2021-03-09 12:58 ` [PATCH 00/11] PM / devfreq: a few small fixes and improvements Dong Aisheng
2021-03-09 12:58 ` [PATCH 01/11] doc: ABI: devfreq: remove invalid central_polling description Dong Aisheng
2021-03-09 12:58 ` [PATCH 02/11] PM / devfreq: remove the invalid description for get_target_freq Dong Aisheng
2021-03-09 12:58 ` [PATCH 03/11] PM / devfreq: fix the wrong set_freq path for userspace governor Dong Aisheng
2021-03-09 12:58 ` [PATCH 04/11] PM / devfreq: bail out early if no freq changes in devfreq_set_target Dong Aisheng
2021-03-09 12:58 ` [PATCH 05/11] PM / devfreq: use more accurate returned new_freq as resume_freq Dong Aisheng
2021-03-09 12:58 ` [PATCH 06/11] PM / devfreq: drop the unnecessary low variable initialization Dong Aisheng
2021-03-09 12:58 ` [PATCH 07/11] PM / devfreq: check get_dev_status before start monitor Dong Aisheng
2021-03-09 12:58 ` [PATCH 08/11] PM / devfreq: check get_dev_status in devfreq_update_stats Dong Aisheng
2021-03-09 12:58 ` [PATCH 09/11] PM / devfreq: governor: optimize simpleondemand get_target_freq Dong Aisheng
2021-03-09 12:58 ` [PATCH 10/11] PM / devfreq: imx8m-ddrc: remove imx8m_ddrc_get_dev_status Dong Aisheng
2021-03-09 12:58 ` [PATCH 11/11] PM / devfreq: imx8m-ddrc: drop polling_ms Dong Aisheng
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