Hi Rajendra,
On 07/11/2013 12:17 PM, Rajendra Nayak wrote:
On Wednesday 10 July 2013 09:37 PM, Felipe Balbi wrote:
how about something like below ? It makes omap_device/hwmod and
pm_runtime agree on the initial state of the device and will prevent
->runtime_resume() from being called on first pm_runtime_get*() done
during probe.
This is similar to what PCI bus does (if you look at pci_pm_init()).
I tried something similar [1] but what I found is that the serial
runtime resume was called despite it being marked as active using
pm_runtime_set_active().
That seems to be because of the pm_runtime_set_autosuspend_delay()
because we have the autosuspend_delay = -1
-----
static void update_autosuspend(struct device *dev, int old_delay, int old_use)
{
int delay = dev->power.autosuspend_delay;
/* Should runtime suspend be prevented now? */
if (dev->power.use_autosuspend && delay < 0) {
/* If it used to be allowed then prevent it. */
if (!old_use || old_delay >= 0) {
atomic_inc(&dev->power.usage_count);
rpm_resume(dev, 0); <------------------------------- calls serial runtime resume.
}
}
-----
So we end up with the same issue with serial resume being called before set_termios()
[1]
diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 5cc9287..c71d47d 100644
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -129,6 +129,7 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
struct device_node *node = pdev->dev.of_node;
const char *oh_name;
int oh_cnt, i, ret = 0;
+ bool device_active = false;
oh_cnt = of_property_count_strings(node, "ti,hwmods");
if (oh_cnt <= 0) {
@@ -152,6 +153,9 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
goto odbfd_exit1;
}
hwmods[i] = oh;
+ if (oh->flags & HWMOD_INIT_NO_IDLE)
+ device_active = true;
+
}
od = omap_device_alloc(pdev, hwmods, oh_cnt);
@@ -172,6 +176,11 @@ static int omap_device_build_from_dt(struct platform_device *pdev)
pdev->dev.pm_domain = &omap_device_pm_domain;
+ if (device_active) {
+ omap_device_enable(pdev);
+ pm_runtime_set_active(&pdev->dev);
+ }
+
odbfd_exit1:
kfree(hwmods);
odbfd_exit:
This solution works good for me in combination with
"serial: omap: enable PM runtime only when its fully configured"
http://www.spinics.net/lists/linux-serial/msg10317.html
(earlyprintk use case)
And I think the best way would be to move forward with yours solution.
- it will affect only on needed IPs drivers - not on all, so no issues
with iommu and etc.
But issue with *non console" UARTs will still be here and, I think,
there are no way ti solve it from OMAP device/hwmod frameworks side,
because only driver can know when his context is ready.
To test do: #echo 0xDEAD > dev/ttyO3
Regards,
-grygorii
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