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[PATCH v2 0/3] ACPI / EC: Add quirk modes for boot EC support

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  [PATCH v2 0/3] ACPI / EC: Add quirk modes for boot EC support Lv Zheng <lv.zheng@intel.com> - 2017-05-19 09:10 +0200
    [PATCH v2 1/3] ACPI / EC: Enhance boot EC sanity check Lv Zheng <lv.zheng@intel.com> - 2017-05-19 09:10 +0200

#1645253 — [PATCH v2 0/3] ACPI / EC: Add quirk modes for boot EC support

It's reported that Asus laptop X580VD/X550VXK/FX502VD/FX502VE have a BIOS
bug where the ECDT correctly states that EC events trigger GPE 0x23, but
the DSDT _GPE method incorrectly returns GPE 0x33.

This patchset fixes this issue.

Link: https://www.spinics.net/lists/linux-acpi/msg73763.html
      https://bugzilla.kernel.org/show_bug.cgi?id=195651

v2: Stops doing craps related to EC_ID (it's already too complicated), and
    reduces one unnecessary boot parameter. For the final bug fix, prefers
    the fix from endlessm.com developers.

Chris Chiu (1):
  ACPI / EC: Fix media keys not working problem on some Asus laptops

Lv Zheng (2):
  ACPI / EC: Enhance boot EC sanity check
  ACPI / EC: Add support to skip boot stage DSDT probe

 drivers/acpi/ec.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 60 insertions(+), 6 deletions(-)

-- 
2.7.4

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#1645256 — [PATCH v2 1/3] ACPI / EC: Enhance boot EC sanity check

It's reported that some buggy BIOS tables can contain 2 DSDT ECs and one of
them is invalid. As we shouldn't evaluate _STA from acpi_ec_dsdt_probe()
due to the unknown Windows enumeration order, this patch simply enhances
sanity checks in ec_parse_device() as a workaround to skip probing wrong
namespace ECs.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=195651
Tested-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
---
 drivers/acpi/ec.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index c24235d..a920db6 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1362,6 +1362,14 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
 				     ec_parse_io_ports, ec);
 	if (ACPI_FAILURE(status))
 		return status;
+	/*
+	 * It's better to evaluate _STA to determine if the device is
+	 * valid. But that could potentially trigger issues related to
+	 * the unknown orders of _INI/_STA evaluations.
+	 * However we can abort due to invalid _CRS information here.
+	 */
+	if (ec->data_addr == 0 || ec->command_addr == 0)
+		return AE_OK;
 
 	/* Get GPE bit assignment (EC events). */
 	/* TODO: Add support for _GPE returning a package */
-- 
2.7.4

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