From: <Jacky.Cao@sony.com>
To: <balbi@kernel.org>, <gregkh@linuxfoundation.org>,
<stern@rowland.harvard.edu>
Cc: <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<Kento.A.Kobayashi@sony.com>, <Jacky.Cao@sony.com>
Subject: [PATCH v3] USB: dummy-hcd: fix power budget for SuperSpeed mode
Date: Thu, 5 Sep 2019 04:11:57 +0000 [thread overview]
Message-ID: <16EA1F625E922C43B00B9D82250220500871CDE5@APYOKXMS108.ap.sony.com> (raw)
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>
---
Changes in v3:
- Rename POWER_BUDGET_3_0 to POWER_BUDGET_3
- Update commit message from USB3.0 specification to USB specification
Changes in v2:
- Fix whitespace damage
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..3d499d9 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_3 900 /* 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
--
2.7.4
next reply other threads:[~2019-09-05 4:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-05 4:11 Jacky.Cao [this message]
2019-09-05 14:14 ` [PATCH v3] USB: dummy-hcd: fix power budget for SuperSpeed mode Alan Stern
2019-09-05 20:55 ` Greg KH
2019-09-06 9:04 ` Jacky.Cao
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