USB: dummy-hcd: fix power budget for SuperSpeed mode

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@sony.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/16EA1F625E922C43B00B9D82250220500871CDE5@APYOKXMS108.ap.sony.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index 8414fac..3d499d9 100644 (file)
--- 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";
@@ -2432,7 +2433,7 @@ static int dummy_start_ss(struct dummy_hcd *dum_hcd)
        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