RE: [PATCH v1 1/2] PM/devfreq: add suspend frequency support
myungjoo.ham at samsung.com
Tue Nov 1 23:35:26 PDT 2016
> Add suspend frequency support and if needed set it to
> the frequency obtained from the suspend opp (can be defined
> using opp-v2 bindings and is optional).
> Change-Id: Iaa0d3848d63d9ce03f65ea76f263e4685a4c295e
> Signed-off-by: Lin Huang <hl at rock-chips.com>
> drivers/devfreq/devfreq.c | 17 ++++++++++++++++-
> include/linux/devfreq.h | 9 +++++++++
> 2 files changed, 25 insertions(+), 1 deletion(-)
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index bf3ea76..d1152eb 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -364,7 +364,10 @@ void devfreq_monitor_suspend(struct devfreq *devfreq)
> - devfreq_update_status(devfreq, devfreq->previous_freq);
> + if (devfreq->suspend_freq)
> + devfreq_update_status(devfreq, devfreq->suspend_freq);
> + else
> + devfreq_update_status(devfreq, devfreq->previous_freq);
This is incorrect.
devfreq_update_status is to record the statistics.
This code intends to record the current status before entering suspend;
thus you should not record "suspend_freq" here.
If you really need to record the frequency during suspended state
for the statistics, you need to do that at resume; however, I object to
that idea either.
If you really want to set a predefined suspend-to-RAM mode frequency,
(probably because of HW instability during resume process)
you need to update, not udpate_status (statistics).
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