[PATCH 4.19 32/81] USB: dummy-hcd: fix power budget for SuperSpeed mode

From: Greg Kroah-Hartman
Date: Wed Oct 16 2019 - 18:10:36 EST


From: Jacky.Cao@xxxxxxxx <Jacky.Cao@xxxxxxxx>

commit 2636d49b64671d3d90ecc4daf971b58df3956519 upstream.

The power budget for SuperSpeed mode should be 900 mA
according to USB specification, so set the power budget
to 900mA for dummy_start_ss which is only used for
SuperSpeed mode.

If the max power consumption of SuperSpeed device is
larger than 500 mA, insufficient available bus power
error happens in usb_choose_configuration function
when the device connects to dummy hcd.

Signed-off-by: Jacky Cao <Jacky.Cao@xxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/16EA1F625E922C43B00B9D82250220500871CDE5@xxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/usb/gadget/udc/dummy_hcd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -48,6 +48,7 @@
#define DRIVER_VERSION "02 May 2005"

#define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
+#define POWER_BUDGET_3 900 /* in mA */

static const char driver_name[] = "dummy_hcd";
static const char driver_desc[] = "USB Host+Gadget Emulator";
@@ -2446,7 +2447,7 @@ static int dummy_start_ss(struct dummy_h
dum_hcd->rh_state = DUMMY_RH_RUNNING;
dum_hcd->stream_en_ep = 0;
INIT_LIST_HEAD(&dum_hcd->urbp_list);
- dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
+ dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3;
dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
#ifdef CONFIG_USB_OTG