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dwc3-msm: Force USB speed as high speed if SS release lane is called

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DP driver shall call SS release lane API asynchronously when USB is into
device mode or host mode or not yet started. This is possible as ADSP
firmware notification over UCSI may be delayed and can be running in
parallel with altmode functionality. Hence force maximum speed as USB
high speed if SS release lane API is called until next USB able disconnect.

Change-Id: Iaae8b4e39ec8695e0204b83d9292cd3efa4af310
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Mayank Rana 2020-05-27 16:03:54 -07:00
commit 7e7b7790b1
1 changed files with 54 additions and 10 deletions
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64
drivers/usb/dwc3/dwc3-msm.c
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@ -481,6 +481,7 @@ struct dwc3_msm {
dma_addr_t dummy_gsi_db_dma;
struct usb_role_switch *role_switch;
bool ss_release_called;
};
#define USB_HSPHY_3P3_VOL_MIN 3050000 /* uV */
@ -3702,6 +3703,15 @@ static int dwc3_msm_usb_set_role(struct device *dev, enum usb_role role)
return 0;
}
if (mdwc->ss_release_called) {
flush_delayed_work(&mdwc->sm_work);
dwc->maximum_speed = USB_SPEED_HIGH;
if (role == USB_ROLE_NONE) {
dwc->maximum_speed = USB_SPEED_UNKNOWN;
mdwc->ss_release_called = false;
}
}
dwc3_ext_event_notify(mdwc);
return 0;
}
@ -3926,6 +3936,30 @@ static void dwc3_start_stop_host(struct dwc3_msm *mdwc, bool start)
dbg_log_string("stop_host_mode completed");
}
static void dwc3_start_stop_device(struct dwc3_msm *mdwc, bool start)
{
struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);
if (start) {
dbg_log_string("start device mode");
mdwc->id_state = DWC3_ID_FLOAT;
mdwc->vbus_active = true;
} else {
dbg_log_string("stop device mode");
mdwc->id_state = DWC3_ID_FLOAT;
mdwc->vbus_active = false;
}
dwc3_ext_event_notify(mdwc);
dbg_event(0xFF, "flush_work", 0);
flush_work(&mdwc->resume_work);
drain_workqueue(mdwc->sm_usb_wq);
if (start)
dbg_log_string("device mode restarted");
else
dbg_log_string("stop_device_mode completed");
}
int dwc3_msm_release_ss_lane(struct device *dev)
{
struct dwc3_msm *mdwc = dev_get_drvdata(dev);
@ -3943,18 +3977,28 @@ int dwc3_msm_release_ss_lane(struct device *dev)
}
dbg_event(0xFF, "ss_lane_release", 0);
if (mdwc->id_state != DWC3_ID_GROUND) {
dbg_log_string("USB host mode is not active");
return 0;
/* flush any pending work */
flush_work(&mdwc->resume_work);
drain_workqueue(mdwc->sm_usb_wq);
mdwc->ss_release_called = true;
if (mdwc->id_state == DWC3_ID_GROUND) {
/* stop USB host mode */
dwc3_start_stop_host(mdwc, false);
/* restart USB host mode into high speed */
dwc->maximum_speed = USB_SPEED_HIGH;
dwc3_start_stop_host(mdwc, true);
} else if (mdwc->vbus_active) {
/* stop USB device mode */
dwc3_start_stop_device(mdwc, false);
/* restart USB device mode into high speed */
dwc->maximum_speed = USB_SPEED_HIGH;
dwc3_start_stop_device(mdwc, true);
} else {
dbg_log_string("USB is not active.\n");
dwc->maximum_speed = USB_SPEED_HIGH;
}
/* stop USB host mode */
dwc3_start_stop_host(mdwc, false);
/* restart USB host mode into high speed */
dwc->maximum_speed = USB_SPEED_HIGH;
dwc3_start_stop_host(mdwc, true);
return 0;
}
EXPORT_SYMBOL(dwc3_msm_release_ss_lane);