Messages in this thread Patch in this message | | | From | <> | Subject | [PATCH] USB: dummy-hcd: fix power budget for SuperSpeed mode | Date | Wed, 4 Sep 2019 07:52:00 +0000 |
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The power budget for SuperSpeed mode should be 900 mA according to USB3.0 specification, so set the power budget to 900 mA 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> --- drivers/usb/gadget/udc/dummy_hcd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c index 8414fac..52f2cf5 100644 --- 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_0 900 /* 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_0; dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; #ifdef CONFIG_USB_OTG -- 2.7.4
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