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authorLv Zheng <lv.zheng@intel.com>2016-06-03 05:26:12 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-06-07 03:29:53 +0300
commitdcf15cbded656a12335bc4151f3f75f10080a375 (patch)
tree0607caf0285a42f43729cc519087fa65611f5d07 /Documentation/cpu-hotplug.txt
parent3d4b7ae96d81dc8ed4ecd556118b632c2707ff08 (diff)
downloadlinux-dcf15cbded656a12335bc4151f3f75f10080a375.tar.xz
ACPI / EC: Fix a boot EC regresion by restoring boot EC support for the DSDT EC
According to the Windows probing result, during the table loading, the EC device described in the ECDT should be used. And the ECDT EC is also effective during the period the namespace objects are initialized (we can see a separate process executing _STA/_INI on Windows before executing other device specific control methods, for example, EC._REG). During the device enumration, the EC device described in the DSDT should be used. But there are differences between Linux and Windows around the device probing order. Thus in Linux, we should enable the DSDT EC as early as possible before enumerating devices in order not to trigger issues related to the device enumeration order differences. This patch thus converts acpi_boot_ec_enable() into acpi_ec_dsdt_probe() to fix the gap. This also fixes a user reported regression triggered after we switched the "table loading"/"ECDT support" to be ACPI spec 2.0 compliant. Fixes: 59f0aa9480cf (ACPI 2.0 / ECDT: Remove early namespace reference from EC) Link: https://bugzilla.kernel.org/show_bug.cgi?id=119261 Reported-and-tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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