From: Grygorii Strashko <grygorii.strashko@ti.com>
To: Tomi Valkeinen <tomi.valkeinen@ti.com>, Tony Lindgren <tony@atomide.com>
Cc: <linux-omap@vger.kernel.org>, "Andrew F . Davis" <afd@ti.com>,
Dave Gerlach <d-gerlach@ti.com>, Faiz Abbas <faiz_abbas@ti.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Keerthy <j-keerthy@ti.com>, Nishanth Menon <nm@ti.com>,
Peter Ujfalusi <peter.ujfalusi@ti.com>,
Roger Quadros <rogerq@ti.com>, Suman Anna <s-anna@ti.com>,
Tero Kristo <t-kristo@ti.com>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<dri-devel@lists.freedesktop.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: Re: [PATCH 1/5] drm/omap: Fix suspend resume regression after platform data removal
Date: Thu, 11 Jun 2020 17:00:59 +0300 [thread overview]
Message-ID: <d03dd04f-6f2c-25ba-fe1f-d5fc0dfb5c68@ti.com> (raw)
In-Reply-To: <9ed70121-2a53-d2b3-051a-88eb83e6c53f@ti.com>
On 09/06/2020 18:26, Tomi Valkeinen wrote:
> On 09/06/2020 18:19, Tony Lindgren wrote:
>>> But there's an extra runtime PM reference (dev.power.usage_count) that seems
>>> to come out of nowhere. So when omap_drm_suspend is finished, there's still
>>> usage_count of 1, and dispc never suspends fully.
>>
>> Hmm no idea about that. My guess is that there might be an issue that was
>> masked earlier with omap_device calling the child runtime_suspend.
>
> Yes. It's how PM works. It calls pm_runtime_get_noresume() before starting the suspend of a device. So I guess omapdrm's suspend has been broken all the time, but it was "fixed" by omap_device.
>
I think I might have an idea what is going wrong.
Before:
+----------------------+
|omap_device_pm_domain |
+---------------+------+------+
| device |
+-------------+
| omap_device |
+-------------+
omap_device is embedded in DD device and PM handled by omap_device_pm_domain.
static int _od_suspend_noirq(struct device *dev)
{
...
ret = pm_generic_suspend_noirq(dev);
[1] ^^ device suspend_noirq call
if (!ret && !pm_runtime_status_suspended(dev)) {
if (pm_generic_runtime_suspend(dev) == 0) {
[2] ^^ device pm_runtime_suspend force call
omap_device_idle(pdev);
[3] ^^ omap_device disable
od->flags |= OMAP_DEVICE_SUSPENDED;
}
}
return ret;
}
Now:
+------------+
|ti sysc dev |
+-+----------+
|
|
| +-------------+
| | device |
+-->+ |
+-------------+
With new approach the omap_device is not embedded in DD Device anymore,
instead ti-sysc (hwmod replacement) became parent of DD Device.
As result suspend sequence became the following
(Note. All PM runtime PUT calls became NOP during suspend by design):
device
|-> suspend() - in case of dss omap_drm_suspend() and Co if defined
|-> suspend_noirq() - in case of dss *not defined", equal to step [1] above
..
ti sysc dev (ti-sysc is parent, so called after device)
|-> sysc_noirq_suspend
|-> pm_runtime_force_suspend()
|-> sysc_runtime_suspend() - equal to step [3] above
And step [2] is missing as of now!
I think, suspend might be fixed if all devices, which are now child of ti-sysc, will do
pm_runtime_force_xxx() calls at noirq suspend stage by adding:
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
Am I missing smth?
--
Best regards,
grygorii
next prev parent reply other threads:[~2020-06-11 13:59 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-31 19:39 [PATCH 0/5] Suspend and resume fixes for omapdrm pdata removal Tony Lindgren
2020-05-31 19:39 ` [PATCH 1/5] drm/omap: Fix suspend resume regression after platform data removal Tony Lindgren
2020-06-03 12:33 ` Tomi Valkeinen
2020-06-03 14:06 ` Tony Lindgren
2020-06-09 7:04 ` Tomi Valkeinen
2020-06-09 15:19 ` Tony Lindgren
2020-06-09 15:26 ` Tomi Valkeinen
2020-06-09 16:52 ` Tony Lindgren
2020-06-09 17:10 ` Tony Lindgren
2020-06-09 17:26 ` Tony Lindgren
2020-06-10 11:47 ` Tomi Valkeinen
2020-06-10 22:41 ` Tony Lindgren
2020-06-11 14:00 ` Grygorii Strashko [this message]
2020-06-11 14:32 ` Tony Lindgren
2020-06-16 13:01 ` Tomi Valkeinen
2020-06-16 15:30 ` Tony Lindgren
2020-06-16 16:56 ` Grygorii Strashko
2020-06-17 6:04 ` Tomi Valkeinen
2020-06-17 12:49 ` Grygorii Strashko
2020-05-31 19:39 ` [PATCH 2/5] bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit Tony Lindgren
2020-06-01 2:19 ` kbuild test robot
2020-06-01 15:01 ` Tony Lindgren
2020-05-31 19:39 ` [PATCH 3/5] bus: ti-sysc: Ignore clockactivity unless specified as a quirk Tony Lindgren
2020-05-31 19:39 ` [PATCH 4/5] bus: ti-sysc: Fix uninitialized framedonetv_irq Tony Lindgren
2020-05-31 19:39 ` [PATCH 5/5] ARM: OMAP2+: Fix legacy mode dss_reset Tony Lindgren
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