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soc: qcom: ssr: Add dependency hooks for subsystem power operations

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The subsystems might depend on other subsystem's state to be powered-on
or powered-off. Hence, add flexibility via 'pon-depends-on' and
'poff-depends-on' device-tree properties. This way, first the dependent
subsystem's power operation would be fulfilled and then this
subsystem's.

Change-Id: I9764178ff9cc3957389f25cb5b0882c75c0d7db0
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>
This commit is contained in:
Raghavendra Rao Ananta
2019-04-22 17:30:33 -07:00
committed by Rishabh Bhatnagar
parent 79f92d5aea
commit f36bc9cda1
3 changed files with 22 additions and 9 deletions
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2
drivers/soc/qcom/spcom.c
View File

@ -631,7 +631,7 @@ static int spcom_handle_restart_sp_command(void *cmd_buf, int cmd_size)
}
pr_debug("restart - Name: %s FW name: %s Depends on: %s\n",
desc_p->name, desc_p->fw_name, desc_p->depends_on);
desc_p->name, desc_p->fw_name, desc_p->pon_depends_on);
desc_powerup = desc_p->powerup;
/**
* Overwrite the subsys PIL powerup function with an spcom

19
drivers/soc/qcom/subsystem_restart.c
View File

@ -956,7 +956,7 @@ void *__subsystem_get(const char *name, const char *fw_name)
goto err_module;
}
subsys_d = subsystem_get(subsys->desc->depends_on);
subsys_d = subsystem_get(subsys->desc->pon_depends_on);
if (IS_ERR(subsys_d)) {
retval = subsys_d;
goto err_depends;
@ -1035,6 +1035,10 @@ void subsystem_put(void *subsystem)
if (IS_ERR_OR_NULL(subsys))
return;
subsys_d = find_subsys_device(subsys->desc->poff_depends_on);
if (subsys_d)
subsystem_put(subsys_d);
track = subsys_get_track(subsys);
mutex_lock(&track->lock);
if (WARN(!subsys->count, "%s: %s: Reference count mismatch\n",
@ -1048,11 +1052,6 @@ void subsystem_put(void *subsystem)
}
mutex_unlock(&track->lock);
subsys_d = find_subsys_device(subsys->desc->depends_on);
if (subsys_d) {
subsystem_put(subsys_d);
put_device(&subsys_d->dev);
}
module_put(subsys->owner);
put_device(&subsys->dev);
return;
@ -1654,6 +1653,14 @@ static int subsys_parse_devicetree(struct subsys_desc *desc)
return PTR_ERR(order);
}
if (of_property_read_string(pdev->dev.of_node, "qcom,pon-depends-on",
&desc->pon_depends_on))
pr_debug("pon-depends-on not set for %s\n", desc->name);
if (of_property_read_string(pdev->dev.of_node, "qcom,poff-depends-on",
&desc->poff_depends_on))
pr_debug("poff-depends-on not set for %s\n", desc->name);
return 0;
}

10
include/soc/qcom/subsystem_restart.h
View File

@ -55,7 +55,12 @@ struct subsys_notif_timeout {
* struct subsys_desc - subsystem descriptor
* @name: name of subsystem
* @fw_name: firmware name
* @depends_on: subsystem this subsystem depends on to operate
* @pon_depends_on: subsystem this subsystem wants to power-on first. If the
* dependednt subsystem is already powered-on, the framework won't try to power
* it back up again.
* @poff_depends_on: subsystem this subsystem wants to power-off first. If the
* dependednt subsystem is already powered-off, the framework won't try to power
* it off again.
* @dev: parent device
* @owner: module the descriptor belongs to
* @shutdown: Stop a subsystem
@ -79,7 +84,8 @@ struct subsys_notif_timeout {
struct subsys_desc {
const char *name;
char fw_name[256];
const char *depends_on;
const char *pon_depends_on;
const char *poff_depends_on;
struct device *dev;
struct module *owner;