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Commit 9799aca2 authored by Kevin Hilman's avatar Kevin Hilman Committed by Paul Walmsley
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OMAP: omap_device: optionally auto-adjust device activate/deactivate latencies 



First, this patch adds new worst-case latency values to the
omap_device_pm_latency struct.  Here the worst-case measured latencies
for the activate and deactivate hooks are stored.

In addition, add an option to auto-adjust the latency values used for
device activate/deactivate.

By setting a new 'OMAP_DEVICE_LATENCY_AUTO_ADJUST' flag in the
omap_device_pm_latency struct, the omap_device layer automatically
adjusts the activate/deactivate latencies to the worst-case measured
values.

Anytime a new worst-case value is found, it is printed to the console.
Here is an example log during boot using UART2 s an example.  After
boot, the OPP is manually changed to the 125MHz OPP:

[...]
Freeing init memory: 128K
omap_device: serial8250.2: new worst case deactivate latency 0: 30517
omap_device: serial8250.2: new worst case activate latency 0: 30517
omap_device: serial8250.2: new worst case activate latency 0: 218139648
omap_device: serial8250.2: new worst case deactivate latency 0: 61035
omap_device: serial8250.2: new worst case activate latency 0: 278076171
omap_device: serial8250.2: new worst case activate latency 0: 298614501
omap_device: serial8250.2: new worst case activate latency 0: 327331542

/ # echo 125000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

omap_device: serial8250.2: new worst case deactivate latency 0: 91552

Motivation: this can be used as a technique to automatically determine
the worst case latency values.  The current method of printing a
warning on every violation is too noisy to actually interact the
console in order to set low OPP to discover latencies.

Another motivation for this patch is that the activate/deactivate
latenices can vary depending on the idlemode of the device.  While
working on the UARTs, I noticed that when using no-idle, the activate
latencies were as high as several hundred msecs as shown above.  When
the UARTs are in smart-idle, the max latency is well under 100 usecs.

Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: default avatarPaul Walmsley <paul@pwsan.com>
parent f0271d65

arch/arm/plat-omap/include/plat/omap_device.h

+4 −0
Original line number Diff line number Diff line
@@ -131,11 +131,15 @@ int omap_device_enable_clocks(struct omap_device *od); 
 */

struct omap_device_pm_latency {

	u32 deactivate_lat;

	u32 deactivate_lat_worst;

	int (*deactivate_func)(struct omap_device *od);

	u32 activate_lat;

	u32 activate_lat_worst;

	int (*activate_func)(struct omap_device *od);

	u32 flags;

};



#define OMAP_DEVICE_LATENCY_AUTO_ADJUST BIT(1)



/* Get omap_device pointer from platform_device pointer */

#define to_omap_device(x) container_of((x), struct omap_device, pdev)

arch/arm/plat-omap/omap_device.c

+33 −8
Original line number Diff line number Diff line
@@ -148,10 +148,22 @@ static int _omap_device_activate(struct omap_device *od, u8 ignore_lat) 
			 "%llu nsec\n", od->pdev.name, od->pm_lat_level,

			 act_lat);



		WARN(act_lat > odpl->activate_lat, "omap_device: %s.%d: "

		     "activate step %d took longer than expected (%llu > %d)\n",

		     od->pdev.name, od->pdev.id, od->pm_lat_level,

		     act_lat, odpl->activate_lat);

		if (act_lat > odpl->activate_lat) {

			odpl->activate_lat_worst = act_lat;

			if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {

				odpl->activate_lat = act_lat;

				pr_warning("omap_device: %s.%d: new worst case "

					   "activate latency %d: %llu\n",

					   od->pdev.name, od->pdev.id,

					   od->pm_lat_level, act_lat);

			} else

				pr_warning("omap_device: %s.%d: activate "

					   "latency %d higher than exptected. "

					   "(%llu > %d)\n",

					   od->pdev.name, od->pdev.id,

					   od->pm_lat_level, act_lat,

					   odpl->activate_lat);

		}



		od->dev_wakeup_lat -= odpl->activate_lat;

	}
@@ -204,10 +216,23 @@ static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat) 
			 "%llu nsec\n", od->pdev.name, od->pm_lat_level,

			 deact_lat);



		WARN(deact_lat > odpl->deactivate_lat, "omap_device: %s.%d: "

		     "deactivate step %d took longer than expected "

		     "(%llu > %d)\n", od->pdev.name, od->pdev.id,

		     od->pm_lat_level, deact_lat, odpl->deactivate_lat);

		if (deact_lat > odpl->deactivate_lat) {

			odpl->deactivate_lat_worst = deact_lat;

			if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {

				odpl->deactivate_lat = deact_lat;

				pr_warning("omap_device: %s.%d: new worst case "

					   "deactivate latency %d: %llu\n",

					   od->pdev.name, od->pdev.id,

					   od->pm_lat_level, deact_lat);

			} else

				pr_warning("omap_device: %s.%d: deactivate "

					   "latency %d higher than exptected. "

					   "(%llu > %d)\n",

					   od->pdev.name, od->pdev.id,

					   od->pm_lat_level, deact_lat,

					   odpl->deactivate_lat);

		}





		od->dev_wakeup_lat += odpl->activate_lat;