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author | Mario Limonciello <mario.limonciello@amd.com> | 2022-03-17 09:14:42 -0500 |
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committer | Hans de Goede <hdegoede@redhat.com> | 2022-03-17 19:47:24 +0100 |
commit | 20e1d6402a71dba7ad2b81f332a3c14c7d3b939b (patch) | |
tree | a132f57ee85b97bff775d1e49fefe54a49418a07 /drivers/acpi/x86 | |
parent | 6060a75e77fb05c9d54ed41cccc496dd98054b57 (diff) | |
download | linux-20e1d6402a71dba7ad2b81f332a3c14c7d3b939b.tar.gz linux-20e1d6402a71dba7ad2b81f332a3c14c7d3b939b.tar.bz2 linux-20e1d6402a71dba7ad2b81f332a3c14c7d3b939b.zip |
ACPI / x86: Add support for LPS0 callback handler
Currenty the latest thing run during a suspend to idle attempt is
the LPS0 `prepare_late` callback and the earliest thing is the
`resume_early` callback.
There is a desire for the `amd-pmc` driver to suspend later in the
suspend process (ideally the very last thing), so create a callback
that it or any other driver can hook into to do this.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220317141445.6498-1-mario.limonciello@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/acpi/x86')
-rw-r--r-- | drivers/acpi/x86/s2idle.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c index abc06e7f89d8..031b20a547f9 100644 --- a/drivers/acpi/x86/s2idle.c +++ b/drivers/acpi/x86/s2idle.c @@ -86,6 +86,8 @@ struct lpi_device_constraint_amd { int min_dstate; }; +static LIST_HEAD(lps0_s2idle_devops_head); + static struct lpi_constraints *lpi_constraints_table; static int lpi_constraints_table_size; static int rev_id; @@ -444,6 +446,8 @@ static struct acpi_scan_handler lps0_handler = { int acpi_s2idle_prepare_late(void) { + struct acpi_s2idle_dev_ops *handler; + if (!lps0_device_handle || sleep_no_lps0) return 0; @@ -474,14 +478,26 @@ int acpi_s2idle_prepare_late(void) acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_ENTRY, lps0_dsm_func_mask_microsoft, lps0_dsm_guid_microsoft); } + + list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) { + if (handler->prepare) + handler->prepare(); + } + return 0; } void acpi_s2idle_restore_early(void) { + struct acpi_s2idle_dev_ops *handler; + if (!lps0_device_handle || sleep_no_lps0) return; + list_for_each_entry(handler, &lps0_s2idle_devops_head, list_node) + if (handler->restore) + handler->restore(); + /* Modern standby exit */ if (lps0_dsm_func_mask_microsoft > 0) acpi_sleep_run_lps0_dsm(ACPI_LPS0_MS_EXIT, @@ -524,4 +540,28 @@ void acpi_s2idle_setup(void) s2idle_set_ops(&acpi_s2idle_ops_lps0); } +int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg) +{ + if (!lps0_device_handle || sleep_no_lps0) + return -ENODEV; + + lock_system_sleep(); + list_add(&arg->list_node, &lps0_s2idle_devops_head); + unlock_system_sleep(); + + return 0; +} +EXPORT_SYMBOL_GPL(acpi_register_lps0_dev); + +void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg) +{ + if (!lps0_device_handle || sleep_no_lps0) + return; + + lock_system_sleep(); + list_del(&arg->list_node); + unlock_system_sleep(); +} +EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev); + #endif /* CONFIG_SUSPEND */ |