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| author | Tushar Behera <tushar.behera@linaro.org> | 2014-03-28 10:50:21 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-04-07 14:15:49 +0200 |
| commit | 39ac5ba51b69a77a30d2e783aed02ec73c9f6d70 (patch) | |
| tree | b63ff6683b2e3e4e2b1e195e2e161d6e3245c00b | |
| parent | 70f6c087573eeb406252ff8d98f511eb5f71496e (diff) | |
| download | lwn-39ac5ba51b69a77a30d2e783aed02ec73c9f6d70.tar.gz lwn-39ac5ba51b69a77a30d2e783aed02ec73c9f6d70.zip | |
PM / domains: Add pd_ignore_unused to keep power domains enabled
Keep all power-domains already enabled by bootloader on, even if no
driver has claimed them. This is useful for debug and development, but
should not be needed on a platform with proper driver support.
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 7 | ||||
| -rw-r--r-- | drivers/base/power/domain.c | 13 |
2 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index bc3478581f67..d4aff4086952 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2558,6 +2558,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. pcmv= [HW,PCMCIA] BadgePAD 4 + pd_ignore_unused + [PM] + Keep all power-domains already enabled by bootloader on, + even if no driver has claimed them. This is useful + for debug and development, but should not be + needed on a platform with proper driver support. + pd. [PARIDE] See Documentation/blockdev/paride.txt. diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 6f54962aae1d..ae098a261fcd 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -705,6 +705,14 @@ static int pm_genpd_runtime_resume(struct device *dev) return 0; } +static bool pd_ignore_unused; +static int __init pd_ignore_unused_setup(char *__unused) +{ + pd_ignore_unused = true; + return 1; +} +__setup("pd_ignore_unused", pd_ignore_unused_setup); + /** * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. */ @@ -712,6 +720,11 @@ void pm_genpd_poweroff_unused(void) { struct generic_pm_domain *genpd; + if (pd_ignore_unused) { + pr_warn("genpd: Not disabling unused power domains\n"); + return; + } + mutex_lock(&gpd_list_lock); list_for_each_entry(genpd, &gpd_list, gpd_list_node) |