• Mario Limonciello's avatar
    platform/x86/amd: pmc: Disable IRQ1 wakeup for RN/CZN · 8e60615e
    Mario Limonciello authored
    By default when the system is configured for low power idle in the FADT
    the keyboard is set up as a wake source.  This matches the behavior that
    Windows uses for Modern Standby as well.
    
    It has been reported that a variety of AMD based designs there are
    spurious wakeups are happening where two IRQ sources are active.
    
    For example:
    ```
    PM: Triggering wakeup from IRQ 9
    PM: Triggering wakeup from IRQ 1
    ```
    
    In these designs IRQ 9 is the ACPI SCI and IRQ 1 is the keyboard.
    One way to trigger this problem is to suspend the laptop and then unplug
    the AC adapter.  The SOC will be in a hardware sleep state and plugging
    in the AC adapter returns control to the kernel's s2idle loop.
    
    Normally if just IRQ 9 was active the s2idle loop would advance any EC
    transactions and no other IRQ being active would cause the s2idle loop
    to put the SOC back into hardware sleep state.
    
    When this bug occurred IRQ 1 is also active even if no keyboard activity
    occurred. This causes the s2idle loop to break and the system to wake.
    
    This is a platform firmware bug triggering IRQ1 without keyboard activity.
    This occurs in Windows as well, but Windows will enter "SW DRIPS" and
    then with no activity enters back into "HW DRIPS" (hardware sleep state).
    
    This issue affects Renoir, Lucienne, Cezanne, and Barcelo platforms. It
    does not happen on newer systems such as Mendocino or Rembrandt.
    
    It's been fixed in newer platform firmware.  To avoid triggering the bug
    on older systems check the SMU F/W version and adjust the policy at suspend
    time for s2idle wakeup from keyboard on these systems. A lot of thought
    and experimentation has been given around the timing of disabling IRQ1,
    and to make it work the "suspend" PM callback is restored.
    Reported-by: default avatarKai-Heng Feng <kai.heng.feng@canonical.com>
    Reported-by: default avatarXaver Hugl <xaver.hugl@gmail.com>
    Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2115
    Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1951Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
    Link: https://lore.kernel.org/r/20230120191519.15926-1-mario.limonciello@amd.comReviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
    Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
    8e60615e
pmc.c 26.1 KB