mdm6600_ctrl: Hold down pwron pin until acknowledged by modem

This ensures that the modem powers down correctly and is
part of the fix required to ensure that the BP powers up
correctly after reflash / over the air update.

Change-Id: Ied6a1fe2213127c944547ac2ed86abaf0eb63bd2
Signed-off-by: James Wylder <james.wylder@motorola.com>

diff --git a/drivers/misc/mdm6600_ctrl.c b/drivers/misc/mdm6600_ctrl.c
index 85b9c391cb5bd9a4ed628b31c3638e6b7db5c98b..7eb2a688a4639683a88dcf0ae9d9576b66e343bf 100644 (file)
--- a/drivers/misc/mdm6600_ctrl.c
+++ b/drivers/misc/mdm6600_ctrl.c
@@ -604,17 +604,17 @@ static void __devexit mdm_ctrl_shutdown(struct platform_device *pdev)
        msleep(100);
        pr_info("%s: ap_status set to %d", mdmctrl, get_ap_status());
 
-       /* Toggle the power, delaying to allow modem to respond */
+       /* Assert PWRON to tell modem to shutdown and leave pin asserted */
+       /* until acknowledged or wait times out */
        set_bp_pwron(1);
        msleep(100);
-       set_bp_pwron(0);
-       msleep(100);
 
        /* This should be enough to power down the modem */
        /* if this doesn't work, reset the modem and try */
        /* one more time, ultimately the modem will be   */
        /* hard powered off */
        pd_failure = bp_shutdown_wait(5);
+       set_bp_pwron(0);
        if (pd_failure) {
                pr_info("%s: Resetting unresponsive modem.", mdmctrl);
                set_bp_resin(1);