net: wwan: t7xx: Change PM_AUTOSUSPEND_MS to 5000

Because optimizing the power consumption of t7XX,
change auto suspend time to 5000.

The Tests uses a script to loop through the power_state
of t7XX.
(for example: /sys/bus/pci/devices/0000\:72\:00.0/power_state)

* If Auto suspend is 20 seconds,
  test script show power_state have 0~5% of the time was in D3 state
  when host don't have data packet transmission.

* Changed auto suspend time to 5 seconds,
  test script show power_state have 50%~80% of the time was in D3 state
  when host don't have data packet transmission.

We tested Fibocom FM350 and our products using the t7xx and they all
benefited from this.

Signed-off-by: Jack Wu <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: JackBBWu

drivers/net/wwan/t7xx/t7xx_pci.c

@@ -49,7 +49,7 @@
 #define T7XX_INIT_TIMEOUT		20
 #define PM_SLEEP_DIS_TIMEOUT_MS		20
 #define PM_ACK_TIMEOUT_MS		1500
-#define PM_AUTOSUSPEND_MS		20000
+#define PM_AUTOSUSPEND_MS		5000
 #define PM_RESOURCE_POLL_TIMEOUT_US	10000
 #define PM_RESOURCE_POLL_STEP_US	100