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authorLv Zheng <lv.zheng@intel.com>2014-10-29 06:33:49 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-10-29 18:52:35 +0300
commit79149001105f18bd2285ada109f9229ea24a7571 (patch)
treee2182dc0ca09820598025686a426181353f01d5e /drivers/acpi/sbs.c
parentdf9ff91801da603079018f21a9412385b62f0f8e (diff)
downloadlinux-79149001105f18bd2285ada109f9229ea24a7571.tar.xz
ACPI / EC: Fix regression due to conflicting firmware behavior between Samsung and Acer.
It is reported that Samsung laptops that need to poll events are broken by the following commit: Commit 3afcf2ece453e1a8c2c6de19cdf06da3772a1b08 Subject: ACPI / EC: Add support to disallow QR_EC to be issued when SCI_EVT isn't set The behaviors of the 2 vendor firmwares are conflict: 1. Acer: OSPM shouldn't issue QR_EC unless SCI_EVT is set, firmware automatically sets SCI_EVT as long as there is event queued up. 2. Samsung: OSPM should issue QR_EC whatever SCI_EVT is set, firmware returns 0 when there is no event queued up. This patch is a quick fix to distinguish the behaviors to make Acer behavior only effective for Acer EC firmware so that the breakages on Samsung EC firmware can be avoided. Fixes: 3afcf2ece453 (ACPI / EC: Add support to disallow QR_EC to be issued ...) Link: https://bugzilla.kernel.org/show_bug.cgi?id=44161 Reported-and-tested-by: Ortwin Glück <odi@odi.ch> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Cc: 3.17+ <stable@vger.kernel.org> # 3.17+ [ rjw : Subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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