mirror of https://gitee.com/openkylin/linux.git
ACPI: scan: Add PNP0D80 to the _DEP exceptions list
The PNP0D80 ("Windows-compatible System Power Management Controller") device ID is used for identifying the special device object providing the LPI (Low-power S0 Idle) _DSM interface [1]. That device object does not supply any operation regions, but it appears in _DEP lists for other devices in the ACPI tables on some systems to enforce specific enumeration ordering that does not matter for Linux. For this reason, _DEP list entries pointing to the device object whose _CID returns PNP0D80 need not be taken into account as real operation region dependencies, so add that device ID to the list of device IDs for which the matching _DEP list entries should be ignored. Accordingly, update the function used for matching device IDs in that list to allow it to check _CID as well as _HID and rename it to acpi_info_matches_ids(). Link: https://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf # [1] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -719,25 +719,40 @@ int acpi_device_add(struct acpi_device *device,
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/* --------------------------------------------------------------------------
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Device Enumeration
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-------------------------------------------------------------------------- */
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static bool acpi_info_matches_hids(struct acpi_device_info *info,
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const char * const hids[])
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static bool acpi_info_matches_ids(struct acpi_device_info *info,
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const char * const ids[])
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{
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struct acpi_pnp_device_id_list *cid_list = NULL;
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int i;
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if (!(info->valid & ACPI_VALID_HID))
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return false;
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for (i = 0; hids[i]; i++) {
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if (!strcmp(info->hardware_id.string, hids[i]))
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if (info->valid & ACPI_VALID_CID)
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cid_list = &info->compatible_id_list;
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for (i = 0; ids[i]; i++) {
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int j;
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if (!strcmp(info->hardware_id.string, ids[i]))
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return true;
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if (!cid_list)
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continue;
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for (j = 0; j < cid_list->count; j++) {
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if (!strcmp(cid_list->ids[j].string, ids[i]))
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return true;
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}
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}
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return false;
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}
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/* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
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static const char * const acpi_ignore_dep_hids[] = {
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static const char * const acpi_ignore_dep_ids[] = {
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"INT3396", /* Windows System Power Management Controller */
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"PNP0D80", /* Windows-compatible System Power Management Controller */
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NULL
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};
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@ -1857,7 +1872,7 @@ static void acpi_device_dep_initialize(struct acpi_device *adev)
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continue;
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}
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skip = acpi_info_matches_hids(info, acpi_ignore_dep_hids);
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skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
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kfree(info);
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if (skip)
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