diff options
| author | Kevin Hilman <khilman@deeprootsystems.com> | 2010-12-21 21:31:55 -0700 |
|---|---|---|
| committer | Paul Walmsley <paul@pwsan.com> | 2010-12-21 21:31:55 -0700 |
| commit | 6081dc348f122cdb76093b2fc6cf5742c968cb69 (patch) | |
| tree | 8036b8bbc876515462cee608d400293bc490a6ec /arch/arm/plat-omap | |
| parent | c80705aa7074045e7431ed2ebeb0f7d5773615ab (diff) | |
| download | linux-6081dc348f122cdb76093b2fc6cf5742c968cb69.tar.bz2 | |
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>
Diffstat (limited to 'arch/arm/plat-omap')
| -rw-r--r-- | arch/arm/plat-omap/include/plat/omap-pm.h | 2 | ||||
| -rw-r--r-- | arch/arm/plat-omap/omap-pm-noop.c | 46 |
2 files changed, 47 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/include/plat/omap-pm.h b/arch/arm/plat-omap/include/plat/omap-pm.h index c07bb44e9e5a..c0a752053039 100644 --- a/arch/arm/plat-omap/include/plat/omap-pm.h +++ b/arch/arm/plat-omap/include/plat/omap-pm.h @@ -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 diff --git a/arch/arm/plat-omap/omap-pm-noop.c b/arch/arm/plat-omap/omap-pm-noop.c index af58daddcf50..b0471bb2d47d 100644 --- a/arch/arm/plat-omap/omap-pm-noop.c +++ b/arch/arm/plat-omap/omap-pm-noop.c @@ -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) |