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13cfc73216
Neither soft poweroff (transition to ACPI power state S5) nor
suspend-to-RAM (transition to state S3) works on the Macbook Pro 11,4 and
11,5.
The problem is related to the [mem 0x7fa00000-0x7fbfffff] space. When we
use that space, e.g., by assigning it to the 00:1c.0 Root Port, the ACPI
Power Management 1 Control Register (PM1_CNT) at [io 0x1804] doesn't work
anymore.
Linux does a soft poweroff (transition to S5) by writing to PM1_CNT. The
theory about why this doesn't work is:
- The write to PM1_CNT causes an SMI
- The BIOS SMI handler depends on something in
[mem 0x7fa00000-0x7fbfffff]
- When Linux assigns [mem 0x7fa00000-0x7fbfffff] to the 00:1c.0 Port, it
covers up whatever the SMI handler uses, so the SMI handler no longer
works correctly
Reserve the [mem 0x7fa00000-0x7fbfffff] space so we don't assign it to
anything.
This is voodoo programming, since we don't know what the real conflict is,
but we've failed to find the root cause.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=103211
Tested-by: thejoe@gmail.com
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Chen Yu <yu.c.chen@intel.com>
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|---|---|---|
| .. | ||
| acpi.c | ||
| amd_bus.c | ||
| broadcom_bus.c | ||
| bus_numa.c | ||
| bus_numa.h | ||
| ce4100.c | ||
| common.c | ||
| direct.c | ||
| early.c | ||
| fixup.c | ||
| i386.c | ||
| init.c | ||
| intel_mid_pci.c | ||
| irq.c | ||
| legacy.c | ||
| Makefile | ||
| mmconfig_32.c | ||
| mmconfig_64.c | ||
| mmconfig-shared.c | ||
| numachip.c | ||
| olpc.c | ||
| pcbios.c | ||
| sta2x11-fixup.c | ||
| xen.c | ||