USB: dummy-hcd: fix power budget for SuperSpeed mode
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Message ID 16EA1F625E922C43B00B9D82250220500871C862@APYOKXMS108.ap.sony.com
State Superseded
Headers show
Series
  • USB: dummy-hcd: fix power budget for SuperSpeed mode
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Commit Message

Jacky.Cao@sony.com Sept. 4, 2019, 7:52 a.m. UTC
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(-)

Comments

Felipe Balbi Sept. 4, 2019, 7:54 a.m. UTC | #1
Hi,

<Jacky.Cao@sony.com> writes:

> 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

Alan, I suppose you're okay with this change?
Greg Kroah-Hartman Sept. 4, 2019, 7:58 a.m. UTC | #2
On Wed, Sep 04, 2019 at 10:54:28AM +0300, Felipe Balbi wrote:
> 
> Hi,
> 
> <Jacky.Cao@sony.com> writes:
> 
> > 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
> 
> Alan, I suppose you're okay with this change?

I'm not ok with the whitespace damage making this patch impossible to
apply :)
Jacky.Cao@sony.com Sept. 4, 2019, 8:52 a.m. UTC | #3
Hi, 

> I'm not ok with the whitespace damage making this patch impossible to apply :)

Sorry for the whitespace damage issue I didn't notice when I copied the content.
Just now I submitted v2 for this patch with whitespace damage issue fix.
Please help to confirm, thank you.

Regards
Jacky
Greg Kroah-Hartman Sept. 4, 2019, 10:01 a.m. UTC | #4
On Wed, Sep 04, 2019 at 08:52:12AM +0000, Jacky.Cao@sony.com wrote:
> Hi, 
> 
> > I'm not ok with the whitespace damage making this patch impossible to apply :)
> 
> Sorry for the whitespace damage issue I didn't notice when I copied the content.
> Just now I submitted v2 for this patch with whitespace damage issue fix.
> Please help to confirm, thank you.

You can always confirm your own submissions by looking on the mailing
list itself, no need to ask anyone else to do that :)

greg k-h
Alan Stern Sept. 4, 2019, 2:21 p.m. UTC | #5
On Wed, 4 Sep 2019, Felipe Balbi wrote:

> 
> Hi,
> 
> <Jacky.Cao@sony.com> writes:
> 
> > 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
> 
> Alan, I suppose you're okay with this change?

Yes.  Except that I think the name POWER_BUDGET_3_0 is a little odd.  
It implies that this change is specific to USB 3.0 -- but it isn't.  
USB 3.1 and 3.2 also have a 900 mA limit, right?

So please consider changing the name to POWER_BUDGET_3.

Alan Stern
Jacky.Cao@sony.com Sept. 5, 2019, 4:18 a.m. UTC | #6
Hi 

> Yes.  Except that I think the name POWER_BUDGET_3_0 is a little odd.
> It implies that this change is specific to USB 3.0 -- but it isn't.
> USB 3.1 and 3.2 also have a 900 mA limit, right?
> 
> So please consider changing the name to POWER_BUDGET_3.
> 
> Alan Stern

Thank you for your comment.
I updated the name from POWER_BUDGET_3_0 to POWER_BUDGET_3 in PATCH v3
and submitted it just now.

Regards
Jacky

Patch
diff mbox series

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