@@ -45,6 +45,7 @@
#define T7XX_PCI_IREG_BASE 0
#define T7XX_PCI_EREG_BASE 2
+#define T7XX_INIT_TIMEOUT 20
#define PM_SLEEP_DIS_TIMEOUT_MS 20
#define PM_ACK_TIMEOUT_MS 1500
#define PM_AUTOSUSPEND_MS 20000
@@ -96,6 +97,7 @@ static int t7xx_pci_pm_init(struct t7xx_pci_dev *t7xx_dev)
spin_lock_init(&t7xx_dev->md_pm_lock);
init_completion(&t7xx_dev->sleep_lock_acquire);
init_completion(&t7xx_dev->pm_sr_ack);
+ init_completion(&t7xx_dev->init_done);
atomic_set(&t7xx_dev->md_pm_state, MTK_PM_INIT);
device_init_wakeup(&pdev->dev, true);
@@ -124,6 +126,7 @@ void t7xx_pci_pm_init_late(struct t7xx_pci_dev *t7xx_dev)
pm_runtime_mark_last_busy(&t7xx_dev->pdev->dev);
pm_runtime_allow(&t7xx_dev->pdev->dev);
pm_runtime_put_noidle(&t7xx_dev->pdev->dev);
+ complete_all(&t7xx_dev->init_done);
}
static int t7xx_pci_pm_reinit(struct t7xx_pci_dev *t7xx_dev)
@@ -529,6 +532,20 @@ static void t7xx_pci_shutdown(struct pci_dev *pdev)
__t7xx_pci_pm_suspend(pdev);
}
+static int t7xx_pci_pm_prepare(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct t7xx_pci_dev *t7xx_dev;
+
+ t7xx_dev = pci_get_drvdata(pdev);
+ if (!wait_for_completion_timeout(&t7xx_dev->init_done, T7XX_INIT_TIMEOUT * HZ)) {
+ dev_warn(dev, "Not ready for system sleep.\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
static int t7xx_pci_pm_suspend(struct device *dev)
{
return __t7xx_pci_pm_suspend(to_pci_dev(dev));
@@ -555,6 +572,7 @@ static int t7xx_pci_pm_runtime_resume(struct device *dev)
}
static const struct dev_pm_ops t7xx_pci_pm_ops = {
+ .prepare = t7xx_pci_pm_prepare,
.suspend = t7xx_pci_pm_suspend,
.resume = t7xx_pci_pm_resume,
.resume_noirq = t7xx_pci_pm_resume_noirq,
@@ -69,6 +69,7 @@ struct t7xx_pci_dev {
struct t7xx_modem *md;
struct t7xx_ccmni_ctrl *ccmni_ctlb;
bool rgu_pci_irq_en;
+ struct completion init_done;
/* Low Power Items */
struct list_head md_pm_entities;
When the system attempts to sleep while mtk_t7xx is not ready, the driver cannot put the device to sleep: [ 12.472918] mtk_t7xx 0000:57:00.0: [PM] Exiting suspend, modem in invalid state [ 12.472936] mtk_t7xx 0000:57:00.0: PM: pci_pm_suspend(): t7xx_pci_pm_suspend+0x0/0x20 [mtk_t7xx] returns -14 [ 12.473678] mtk_t7xx 0000:57:00.0: PM: dpm_run_callback(): pci_pm_suspend+0x0/0x1b0 returns -14 [ 12.473711] mtk_t7xx 0000:57:00.0: PM: failed to suspend async: error -14 [ 12.764776] PM: Some devices failed to suspend, or early wake event detected Mediatek confirmed the device can take a rather long time to complete its initialization, so wait for up to 20 seconds until init is done. Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> --- v2: - Define timeout value - Return error if prepare callback fails. drivers/net/wwan/t7xx/t7xx_pci.c | 18 ++++++++++++++++++ drivers/net/wwan/t7xx/t7xx_pci.h | 1 + 2 files changed, 19 insertions(+)