diff options
Diffstat (limited to 'src/southbridge/intel/bd82x6x/me.c')
| -rw-r--r-- | src/southbridge/intel/bd82x6x/me.c | 62 |
1 files changed, 61 insertions, 1 deletions
diff --git a/src/southbridge/intel/bd82x6x/me.c b/src/southbridge/intel/bd82x6x/me.c index fe2a37c849..c522d77a11 100644 --- a/src/southbridge/intel/bd82x6x/me.c +++ b/src/southbridge/intel/bd82x6x/me.c @@ -9,6 +9,7 @@ */ #include <acpi/acpi.h> +#include <cf9_reset.h> #include <device/mmio.h> #include <device/device.h> #include <device/pci.h> @@ -19,6 +20,9 @@ #include <string.h> #include <delay.h> #include <elog.h> +#include <halt.h> +#include <option.h> +#include <southbridge/intel/common/me.h> #include "me.h" #include "pch.h" @@ -248,13 +252,20 @@ static me_bios_path intel_me_path(struct device *dev) static void intel_me_init(struct device *dev) { me_bios_path path = intel_me_path(dev); + u8 me_state = 0, me_state_prev = 0; + bool need_reset = false; + struct me_hfs hfs; /* Do initial setup and determine the BIOS path */ printk(BIOS_NOTICE, "ME: BIOS path: %s\n", me_get_bios_path_string(path)); + get_option(&me_state, "me_state"); + get_option(&me_state_prev, "me_state_prev"); + + printk(BIOS_DEBUG, "ME: me_state=%u, me_state_prev=%u\n", me_state, me_state_prev); + switch (path) { case ME_S3WAKE_BIOS_PATH: - case ME_DISABLE_BIOS_PATH: #if CONFIG(HIDE_MEI_ON_ERROR) case ME_ERROR_BIOS_PATH: #endif @@ -277,12 +288,49 @@ static void intel_me_init(struct device *dev) mkhi_get_fwcaps(); } + /* Put ME in Software Temporary Disable Mode, if needed */ + if (me_state == CMOS_ME_STATE_DISABLED + && CMOS_ME_STATE(me_state_prev) == CMOS_ME_STATE_NORMAL) { + printk(BIOS_INFO, "ME: disabling ME\n"); + if (enter_soft_temp_disable()) { + enter_soft_temp_disable_wait(); + need_reset = true; + } else { + printk(BIOS_ERR, "ME: failed to enter Soft Temporary Disable mode\n"); + } + + break; + } + /* * Leave the ME unlocked in this path. * It will be locked via SMI command later. */ break; + case ME_DISABLE_BIOS_PATH: + /* Bring ME out of Soft Temporary Disable mode, if needed */ + pci_read_dword_ptr(dev, &hfs, PCI_ME_HFS); + if (hfs.operation_mode == ME_HFS_MODE_DIS + && me_state == CMOS_ME_STATE_NORMAL + && (CMOS_ME_STATE(me_state_prev) == CMOS_ME_STATE_DISABLED + || !CMOS_ME_CHANGED(me_state_prev))) { + printk(BIOS_INFO, "ME: re-enabling ME\n"); + + exit_soft_temp_disable(dev); + exit_soft_temp_disable_wait(dev); + + /* + * ME starts loading firmware immediately after writing to H_GS, + * but Lenovo BIOS performs a reboot after bringing ME back to + * Normal mode. Assume that global reset is needed. + */ + need_reset = true; + } else { + intel_me_hide(dev); + } + break; + #if !CONFIG(HIDE_MEI_ON_ERROR) case ME_ERROR_BIOS_PATH: #endif @@ -290,6 +338,18 @@ static void intel_me_init(struct device *dev) case ME_FIRMWARE_UPDATE_BIOS_PATH: break; } + + /* To avoid boot loops if ME fails to get back from disabled mode, + set the 'changed' bit here. */ + if (me_state != CMOS_ME_STATE(me_state_prev) || need_reset) { + u8 new_state = me_state | CMOS_ME_STATE_CHANGED; + set_option("me_state_prev", &new_state); + } + + if (need_reset) { + set_global_reset(true); + full_reset(); + } } static struct device_operations device_ops = { |