usb: msm_otg: Allow delayed LPM upon cable disconnect
This change introduces a new module parameter,
which allows to use 1 second delay before entering Low
Power Mode, after USB cable is disconnected.
This change is needed, since for some platforms, there
are external HW blocks (e.g., A2) that interact with USB
shortly after USB cable is disconnected, and require USB
clocks to be enabled.
Change-Id: Ia63839e84ec1c7ab8816ad1b035f1026acaa1e66
Signed-off-by: Amit Blay <ablay@codeaurora.org>
diff --git a/drivers/usb/otg/msm_otg.c b/drivers/usb/otg/msm_otg.c
index 92cbe6f..3d86152 100644
--- a/drivers/usb/otg/msm_otg.c
+++ b/drivers/usb/otg/msm_otg.c
@@ -82,6 +82,11 @@
MODULE_PARM_DESC(override_phy_init,
"Override HSUSB PHY Init Settings");
+unsigned int lpm_disconnect_thresh = 1000;
+module_param(lpm_disconnect_thresh , uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(lpm_disconnect_thresh,
+ "Delay before entering LPM on USB disconnect");
+
static DECLARE_COMPLETION(pmic_vbus_init);
static struct msm_otg *the_msm_otg;
static bool debug_aca_enabled;
@@ -2440,7 +2445,12 @@
msm_otg_notify_charger(motg, 0);
msm_otg_reset(otg->phy);
pm_runtime_put_noidle(otg->phy->dev);
- pm_runtime_suspend(otg->phy->dev);
+ /*
+ * Only if autosuspend was enabled in probe, it will be
+ * used here. Otherwise, no delay will be used.
+ */
+ pm_runtime_mark_last_busy(otg->phy->dev);
+ pm_runtime_autosuspend(otg->phy->dev);
}
break;
case OTG_STATE_B_SRP_INIT:
@@ -3990,6 +4000,12 @@
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
+ if (motg->pdata->delay_lpm_on_disconnect) {
+ pm_runtime_set_autosuspend_delay(&pdev->dev,
+ lpm_disconnect_thresh);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ }
+
if (motg->pdata->bus_scale_table) {
motg->bus_perf_client =
msm_bus_scale_register_client(motg->pdata->bus_scale_table);