[PATCH v2] bus: mhi: host: pci_generic: Update the default autosuspend_delay_ms as 5000ms

[Slark Xiao]

For some MHI devices in some specific scenario, the default value
of autosuspend_delay_ms may not enough to handle last wake event.
This may lead to some unexpected problems.

Refer to the Qualcomm's Windows settings and we checked this with
Quaclomm over case, Qualcomm recommend us to set this as 5000ms.
Qualcomm also suggests us to update this for all MHI devices.
Since this setting has affected some existed kernel versions, it's
better to be applied to stable version.

Fixes: d3800c1dce24 ("bus: mhi: pci_generic: Add support for runtime PM")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Slark Xiao <slark_xiao@xxxxxxx>
---
v2: define a autosuspend delay timeout and explain the reason
---
 drivers/bus/mhi/host/pci_generic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
index 7193a384cca4..1f52542794d7 100644
--- a/drivers/bus/mhi/host/pci_generic.c
+++ b/drivers/bus/mhi/host/pci_generic.c
@@ -21,6 +21,9 @@
 
 #define MHI_POST_RESET_DELAY_MS 2000
 
+/* Add define of  initial autosuspend_delay_ms to accommodate a potential 'late wake-event' issue */
+#define MHI_AUTOSUSPEND_DELAY_MS 5000
+
 #define HEALTH_CHECK_PERIOD (HZ * 2)
 
 /* PCI VID definitions */
@@ -1483,7 +1486,7 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	/* Allow runtime suspend only if both PME from D3Hot and M3 are supported */
 	if (pci_pme_capable(pdev, PCI_D3hot) && !(info->no_m3)) {
-		pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
+		pm_runtime_set_autosuspend_delay(&pdev->dev, MHI_AUTOSUSPEND_DELAY_MS);
 		pm_runtime_use_autosuspend(&pdev->dev);
 		pm_runtime_mark_last_busy(&pdev->dev);
 		pm_runtime_put_noidle(&pdev->dev);
-- 
2.53.0