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: Kai-Heng Feng kai.heng.feng@canonical.com Reported-by: Xaver Hugl xaver.hugl@gmail.com Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2115 Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1951 Signed-off-by: Mario Limonciello mario.limonciello@amd.com Link: https://lore.kernel.org/r/20230120191519.15926-1-mario.limonciello@amd.com Reviewed-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Hans de Goede hdegoede@redhat.com (cherry picked from commit 8e60615e8932167057b363c11a7835da7f007106) (cherry picked from commit f6045de1f53268131ea75a99b210b869dcc150b2) These have been hand modified for missing dependency commits. Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1921#note_1770257 Signed-off-by: Mario Limonciello mario.limonciello@amd.com --- drivers/platform/x86/amd-pmc.c | 59 ++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+)

diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c index d3efd514614c..4320c79bd6fc 100644 --- a/drivers/platform/x86/amd-pmc.c +++ b/drivers/platform/x86/amd-pmc.c @@ -20,6 +20,7 @@ #include <linux/module.h> #include <linux/pci.h> #include <linux/platform_device.h> +#include <linux/serio.h> #include <linux/suspend.h> #include <linux/seq_file.h> #include <linux/uaccess.h> @@ -110,6 +111,10 @@ struct amd_pmc_dev { u32 base_addr; u32 cpu_id; u32 active_ips; +/* SMU version information */ + u16 major; + u16 minor; + u16 rev; struct device *dev; struct mutex lock; /* generic mutex lock */ #if IS_ENABLED(CONFIG_DEBUG_FS) @@ -201,6 +206,24 @@ static int s0ix_stats_show(struct seq_file *s, void *unused) } DEFINE_SHOW_ATTRIBUTE(s0ix_stats);

+static int amd_pmc_get_smu_version(struct amd_pmc_dev *dev) +{ + int rc; + u32 val; + + rc = amd_pmc_send_cmd(dev, 0, &val, SMU_MSG_GETSMUVERSION, 1); + if (rc) + return rc; + + dev->major = (val >> 16) & GENMASK(15, 0); + dev->minor = (val >> 8) & GENMASK(7, 0); + dev->rev = (val >> 0) & GENMASK(7, 0); + + dev_dbg(dev->dev, "SMU version is %u.%u.%u\n", dev->major, dev->minor, dev->rev); + + return 0; +} + static void amd_pmc_dbgfs_unregister(struct amd_pmc_dev *dev) { debugfs_remove_recursive(dev->dbgfs_dir); @@ -339,12 +362,48 @@ static int amd_pmc_get_os_hint(struct amd_pmc_dev *dev) return -EINVAL; }

+static int amd_pmc_czn_wa_irq1(struct amd_pmc_dev *pdev) +{ + struct device *d; + int rc; + + if (!pdev->major) { + rc = amd_pmc_get_smu_version(pdev); + if (rc) + return rc; + } + + if (pdev->major > 64 || (pdev->major == 64 && pdev->minor > 65)) + return 0; + + d = bus_find_device_by_name(&serio_bus, NULL, "serio0"); + if (!d) + return 0; + if (device_may_wakeup(d)) { + dev_info_once(d, "Disabling IRQ1 wakeup source to avoid platform firmware bug\n"); + disable_irq_wake(1); + device_set_wakeup_enable(d, false); + } + put_device(d); + + return 0; +} + static int __maybe_unused amd_pmc_suspend(struct device *dev) { struct amd_pmc_dev *pdev = dev_get_drvdata(dev); int rc; u8 msg;

+ if (pdev->cpu_id == AMD_CPU_ID_CZN) { + int rc = amd_pmc_czn_wa_irq1(pdev); + + if (rc) { + dev_err(pdev->dev, "failed to adjust keyboard wakeup: %d\n", rc); + return rc; + } + } + /* Reset and Start SMU logging - to monitor the s0i3 stats */ amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_RESET, 0); amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_START, 0);