kernel/linux.git/drivers/opp/opp.h, branch v4.19.112

OPP: Fix missing debugfs supply directory for OPPs

2020-01-27T13:50:04+00:00

[ Upstream commit 46f48aca2e5aef3f430e95d1a5fb68227ec8ec85 ] There is one case where we may end up with no "supply" directory for the OPPs in debugfs. That happens when the OPP core isn't managing the regulators for the device and the device's OPP do have microvolt property. It happens because the opp_table->regulator_count remains set to 0 and the debugfs routines don't add any supply directory in such a case. This commit fixes that by setting opp_table->regulator_count to 1 in that particular case. But to make everything work nicely and not break other parts of the core, regulator_count is defined as "int" now instead of "unsigned int" and it can have different special values now. It is set to -1 initially to mark it "uninitialized" and later only we set it to 0 or positive values after checking how many supplies are there. This also helps in finding the bugs where only few of the OPPs have the "opp-microvolt" property set and not all. Fixes: 1fae788ed640 ("PM / OPP: Don't create debugfs "supply-0" directory unnecessarily") Reported-by: Quentin Perret Signed-off-by: Viresh Kumar Signed-off-by: Sasha Levin

Revert "OPP: Protect dev_list with opp_table lock"

2019-11-24T07:19:09+00:00

This reverts commit 4c64ce947cfa447993efe005cbaad7ba31a91612 which is commit 3d2556992a878a2210d3be498416aee39e0c32aa upstream. Turns out to break the build on the odroid machines, so it needs to be reverted. Reported-by: Viresh Kumar Reported-by: "kernelci.org bot" Cc: Niklas Cassel Cc: Sasha Levin Signed-off-by: Greg Kroah-Hartman

OPP: Protect dev_list with opp_table lock

2019-11-20T17:47:00+00:00

[ Upstream commit 3d2556992a878a2210d3be498416aee39e0c32aa ] The dev_list needs to be protected with a lock, else we may have simultaneous access (addition/removal) to it and that would be racy. Extend scope of the opp_table lock to protect dev_list as well. Tested-by: Niklas Cassel Signed-off-by: Viresh Kumar Signed-off-by: Sasha Levin

PM / OPP: Remove dev_pm_opp_{un}register_get_pstate_helper()

2018-05-09T04:45:21+00:00

These helpers aren't used anymore, remove them. Signed-off-by: Viresh Kumar Reviewed-by: Ulf Hansson

PM / OPP: Implement of_dev_pm_opp_find_required_opp()

2018-05-09T04:45:19+00:00

A device's DT node or its OPP nodes can contain a phandle to other device's OPP node, in the "required-opps" property. This patch implements a routine to find that required OPP from the node that contains the "required-opps" property. Signed-off-by: Viresh Kumar Reviewed-by: Ulf Hansson

PM / OPP: "opp-hz" is optional for power domains

2018-05-09T04:45:18+00:00

"opp-hz" property is optional for power domains now and we shouldn't error out if it is missing for power domains. This patch creates two new routines, _get_opp_count() and _opp_is_duplicate(), by separating existing code from their parent functions. Also skip duplicate OPP check for power domain OPPs as they may not have any the "opp-hz" field, but a platform specific performance state binding to uniquely identify OPP nodes. By default the debugfs OPP nodes are named using the "rate" value, but that isn't possible for the power domain OPP nodes and hence they use the index of the OPP node in the OPP node list instead. Signed-off-by: Viresh Kumar Reviewed-by: Ulf Hansson

PM / OPP: Add dev_pm_opp_{un}register_get_pstate_helper()

2017-10-13T22:54:41+00:00

This adds the dev_pm_opp_{un}register_get_pstate_helper() helper routines which will be used to set the get_pstate() callback for a device. This callback will be later called internally by the OPP core to get performance state corresponding to an OPP. This is required temporarily until the time we have proper DT bindings to include the performance state information. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki

PM / OPP: Support updating performance state of device's power domain

2017-10-13T22:54:40+00:00

The genpd framework now provides an API to request device's power domain to update its performance state. Use that interface from the OPP core for devices whose power domains support performance states. Note that this commit doesn't add any mechanism by which performance states are made available to the OPP core. That would be done by a later commit. Note that the current implementation is restricted to the case where the device doesn't have separate regulators for itself. We shouldn't over engineer the code before we have real use case for them. We can always come back and add more code to support such cases later on. Tested-by: Rajendra Nayak Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki

PM / OPP: Move the OPP directory out of power/

2017-10-03T00:45:12+00:00

The drivers/base/power/ directory is special and contains code related to power management core like system suspend/resume, hibernation, etc. It was fine to keep the OPP code inside it when we had just one file for it, but it is growing now and already has a directory for itself. Lets move it directly under drivers/ directory, just like cpufreq and cpuidle. Signed-off-by: Viresh Kumar Acked-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki