The `OS_HINT` message is supposed to indicate that everything else
that is supposed to go into the deepest state has done so.
This assumption is invalid as:
1) The CPUs will still go in and out of the deepest state
2) Other devices may still run their `noirq` suspend routines
3) The LPS0 ACPI device will still run
To more closely mirror how this works on other operating systems,
move the `amd-pmc` suspend to the very last thing before the s2idle
loop via an lps0 callback.
Fixes: 8d89835b0467 ("PM: suspend: Do not pause cpuidle in the suspend-to-idle path")
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
changes from v3->v4:
* Drop constraints messaging
* Adjust for changes on earlier patches
* Don't fail init if sleep_no_lps0 is set
changes from v2->v3:
* no changes
changes from v1->v2:
* adjust for changes in previous patches
* display a debugging message for constraints
drivers/platform/x86/amd-pmc.c | 49 +++++++++++++++++-----------------
1 file changed, 24 insertions(+), 25 deletions(-)
diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c
index 971aaabaa9c8..d4b1bf4b58b6 100644
--- a/drivers/platform/x86/amd-pmc.c
+++ b/drivers/platform/x86/amd-pmc.c
@@ -639,9 +639,9 @@ static int amd_pmc_verify_czn_rtc(struct amd_pmc_dev *pdev, u32 *arg)
return rc;
}
-static int __maybe_unused amd_pmc_suspend(struct device *dev)
+static void amd_pmc_s2idle_prepare(void)
{
- struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
+ struct amd_pmc_dev *pdev = &pmc;
int rc;
u8 msg;
u32 arg = 1;
@@ -653,56 +653,53 @@ static int __maybe_unused amd_pmc_suspend(struct device *dev)
/* Activate CZN specific RTC functionality */
if (pdev->cpu_id == AMD_CPU_ID_CZN) {
rc = amd_pmc_verify_czn_rtc(pdev, &arg);
- if (rc)
+ if (rc) {
+ dev_err(pdev->dev, "failed to set RTC: %d\n", rc);
goto fail;
+ }
}
/* Dump the IdleMask before we send hint to SMU */
- amd_pmc_idlemask_read(pdev, dev, NULL);
+ amd_pmc_idlemask_read(pdev, pdev->dev, NULL);
msg = amd_pmc_get_os_hint(pdev);
rc = amd_pmc_send_cmd(pdev, arg, NULL, msg, 0);
if (rc) {
- dev_err(pdev->dev, "suspend failed\n");
+ dev_err(pdev->dev, "suspend failed: %d\n", rc);
goto fail;
}
if (enable_stb)
rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_PREDEF);
- if (rc) {
- dev_err(pdev->dev, "error writing to STB\n");
- goto fail;
- }
-
- return 0;
+ if (rc)
+ dev_err(pdev->dev, "error writing to STB: %d\n", rc);
fail:
if (pdev->cpu_id == AMD_CPU_ID_CZN)
cpu_latency_qos_update_request(&pdev->amd_pmc_pm_qos_req,
PM_QOS_DEFAULT_VALUE);
- return rc;
}
-static int __maybe_unused amd_pmc_resume(struct device *dev)
+static void amd_pmc_s2idle_restore(void)
{
- struct amd_pmc_dev *pdev = dev_get_drvdata(dev);
+ struct amd_pmc_dev *pdev = &pmc;
int rc;
u8 msg;
msg = amd_pmc_get_os_hint(pdev);
rc = amd_pmc_send_cmd(pdev, 0, NULL, msg, 0);
if (rc)
- dev_err(pdev->dev, "resume failed\n");
+ dev_err(pdev->dev, "resume failed: %d\n", rc);
/* Let SMU know that we are looking for stats */
amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, 0);
/* Dump the IdleMask to see the blockers */
- amd_pmc_idlemask_read(pdev, dev, NULL);
+ amd_pmc_idlemask_read(pdev, pdev->dev, NULL);
/* Write data incremented by 1 to distinguish in stb_read */
if (enable_stb)
rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_PREDEF + 1);
if (rc)
- dev_err(pdev->dev, "error writing to STB\n");
+ dev_err(pdev->dev, "error writing to STB: %d\n", rc);
/* Restore the QoS request back to defaults if it was set */
if (pdev->cpu_id == AMD_CPU_ID_CZN)
@@ -711,15 +708,8 @@ static int __maybe_unused amd_pmc_resume(struct device *dev)
/* Notify on failed entry */
amd_pmc_validate_deepest(pdev);
-
- return rc;
}
-static const struct dev_pm_ops amd_pmc_pm_ops = {
- .suspend_noirq = amd_pmc_suspend,
- .resume_noirq = amd_pmc_resume,
-};
-
static const struct pci_device_id pmc_pci_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_YC) },
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_CZN) },
@@ -802,6 +792,11 @@ static int amd_pmc_read_stb(struct amd_pmc_dev *dev, u32 *buf)
return 0;
}
+static struct acpi_s2idle_dev_ops amd_pmc_s2idle_dev_ops = {
+ .prepare = amd_pmc_s2idle_prepare,
+ .restore = amd_pmc_s2idle_restore,
+};
+
static int amd_pmc_probe(struct platform_device *pdev)
{
struct amd_pmc_dev *dev = &pmc;
@@ -884,6 +879,10 @@ static int amd_pmc_probe(struct platform_device *pdev)
amd_pmc_get_smu_version(dev);
platform_set_drvdata(pdev, dev);
+ err = acpi_register_lps0_dev(&amd_pmc_s2idle_dev_ops);
+ if (err)
+ dev_warn(dev->dev, "failed to register LPS0 sleep handler, expect increased power consumption\n");
+
amd_pmc_dbgfs_register(dev);
cpu_latency_qos_add_request(&dev->amd_pmc_pm_qos_req, PM_QOS_DEFAULT_VALUE);
return 0;
@@ -897,6 +896,7 @@ static int amd_pmc_remove(struct platform_device *pdev)
{
struct amd_pmc_dev *dev = platform_get_drvdata(pdev);
+ acpi_unregister_lps0_dev(&amd_pmc_s2idle_dev_ops);
amd_pmc_dbgfs_unregister(dev);
pci_dev_put(dev->rdev);
mutex_destroy(&dev->lock);
@@ -917,7 +917,6 @@ static struct platform_driver amd_pmc_driver = {
.driver = {
.name = "amd_pmc",
.acpi_match_table = amd_pmc_acpi_ids,
- .pm = &amd_pmc_pm_ops,
},
.probe = amd_pmc_probe,
.remove = amd_pmc_remove,
--
2.34.1
