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OMAP: PM noop: implement context loss count for non-omap_devices 

For devices which have not (yet) been converted to use omap_device,
implement the context loss counter using the "brutal method" as
originally proposed by Paul Walmsley[1].

The dummy context loss counter is incremented every time it is
checked, but only when off-mode is enabled.  When off-mode is
disabled, the dummy counter stops incrementing.

Tested on 36xx/Zoom3 using MMC driver, which is currently the
only in-tree user of this API.

This patch should be reverted after all devices are converted to using
omap_device.

[1] http://marc.info/?l=linux-omap&m=129176260000626&w=2

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
[paul@pwsan.com: fixed compile warning; fixed to compile on OMAP1]
Signed-off-by: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Kevin Hilman 2010-12-21 21:31:55 -07:00 committed by Paul Walmsley
parent c80705aa70
commit 6081dc348f
3 changed files with 52 additions and 1 deletions
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5
arch/arm/mach-omap2/pm-debug.c
View File

@ -32,6 +32,7 @@
#include "powerdomain.h"
#include "clockdomain.h"
#include <plat/dmtimer.h>
#include <plat/omap-pm.h>
#include "cm2xxx_3xxx.h"
#include "prm2xxx_3xxx.h"
@ -581,6 +582,10 @@ static int option_set(void *data, u64 val)
*option = val;
if (option == &enable_off_mode) {
if (val)
omap_pm_enable_off_mode();
else
omap_pm_disable_off_mode();
if (cpu_is_omap34xx())
omap3_pm_off_mode_enable(val);
}

2
arch/arm/plat-omap/include/plat/omap-pm.h
View File

@ -354,5 +354,7 @@ unsigned long omap_pm_cpu_get_freq(void);
*/
u32 omap_pm_get_dev_context_loss_count(struct device *dev);
void omap_pm_enable_off_mode(void);
void omap_pm_disable_off_mode(void);
#endif

46
arch/arm/plat-omap/omap-pm-noop.c
View File

@ -26,6 +26,9 @@
#include <plat/omap-pm.h>
#include <plat/omap_device.h>
static bool off_mode_enabled;
static u32 dummy_context_loss_counter;
/*
* Device-driver-originated constraints (via board-*.c files)
*/
@ -280,10 +283,34 @@ unsigned long omap_pm_cpu_get_freq(void)
return 0;
}
/**
* omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled
*
* Intended for use only by OMAP PM core code to notify this layer
* that off mode has been enabled.
*/
void omap_pm_enable_off_mode(void)
{
off_mode_enabled = true;
}
/**
* omap_pm_disable_off_mode - notify OMAP PM that off-mode is disabled
*
* Intended for use only by OMAP PM core code to notify this layer
* that off mode has been disabled.
*/
void omap_pm_disable_off_mode(void)
{
off_mode_enabled = false;
}
/*
* Device context loss tracking
*/
#ifdef CONFIG_ARCH_OMAP2PLUS
u32 omap_pm_get_dev_context_loss_count(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
@ -292,13 +319,30 @@ u32 omap_pm_get_dev_context_loss_count(struct device *dev)
if (WARN_ON(!dev))
return 0;
count = omap_device_get_context_loss_count(pdev);
if (dev->parent == &omap_device_parent) {
count = omap_device_get_context_loss_count(pdev);
} else {
WARN_ONCE(off_mode_enabled, "omap_pm: using dummy context loss counter; device %s should be converted to omap_device",
dev_name(dev));
if (off_mode_enabled)
dummy_context_loss_counter++;
count = dummy_context_loss_counter;
}
pr_debug("OMAP PM: context loss count for dev %s = %d\n",
dev_name(dev), count);
return count;
}
#else
u32 omap_pm_get_dev_context_loss_count(struct device *dev)
{
return dummy_context_loss_counter;
}
#endif
/* Should be called before clk framework init */
int __init omap_pm_if_early_init(void)