I'm currently debugging a weird issue where the PC appears to be
attempting to S3 suspend prematurely in acpi_enter_sleep_state().
The PC is a Sony Vaio PCG-SRX51P/B notebook (Intel 850MHz, 384MB, kernel
2.6.20-16) with Ubuntu 7.04 Feisty 32-bit with CONFIG_ACPI_DEBUG.
I added some additional debug messages to acpi_enter_sleep_state() and
find that after the 1st write to "PM1B (SLP_TYP data)" but before
writing "PM1A (SLP_TYP + SLP_EN)" the PC appears to suspend prematurely,
and then instantly comes back with "Back to C!".
It doesn't seem to fail via the ACPI_FAILURE()... return_ACPI_STATUS()
logic as far as I can tell.
Here's the log entries:
kernel: [ 328.044000] hwsleep-0285 [03] enter_sleep_state :
Entering sleep state [S3]
kernel: [ 328.044000] hwsleep-0308 [03] enter_sleep_state :
Writing PM1A (SLP_TYP data) 1401
kernel: [ 328.044000] hwsleep-0319 [03] enter_sleep_state :
Writing PM1B (SLP_TYP data) 1401
kernel: [ 328.044000] hwsleep-0326 [03] enter_sleep_state : Just
written PM1B (SLP_TYP data). status=0x0
kernel: [ 328.044000] Back to C!
Any ideas?
TJ.
-----drivers/acpi/hardware/hwsleep.c::acpi_enter_sleep_state()----
/* Write #1: fill in SLP_TYP data */
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Writing PM1A (SLP_TYP data) %x\n",
PM1Acontrol));
#endif
status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1A_CONTROL,
PM1Acontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Writing PM1B (SLP_TYP data) %x\n",
PM1Bcontrol));
#endif
status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1B_CONTROL,
PM1Bcontrol);
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Just written PM1B (SLP_TYP data).
status=0x%x\n", status));
#endif
if (ACPI_FAILURE(status)) {
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Failed writing PM1B (SLP_TYP data).
status=0x%x\n", status));
#endif
return_ACPI_STATUS(status);
}
/* Insert SLP_ENABLE bit */
PM1Acontrol |= sleep_enable_reg_info->access_bit_mask;
PM1Bcontrol |= sleep_enable_reg_info->access_bit_mask;
/* Write #2: SLP_TYP + SLP_EN */
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "About to flush CPU cache\n"));
#endif
ACPI_FLUSH_CPU_CACHE();
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Writing PM1A (SLP_TYP + SLP_EN) %x\n",
PM1Acontrol));
#endif
status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1A_CONTROL,
PM1Acontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Writing PM1B (SLP_TYP + SLP_EN) %x\n",
PM1Bcontrol));
#endif
status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1B_CONTROL,
PM1Bcontrol);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
#ifdef DEBUG_RESUME
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Just done sleep S3\n"));
#endif
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