linux-kernel - Re: [PATCH] usb: dwc2: gadget: respect driver's max

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Date:   Mon, 8 Nov 2021 14:44:53 +0000
From:   John Keeping <john@...anate.com>
To:     Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc2: gadget: respect driver's max_speed

On Mon, Nov 08, 2021 at 07:56:50AM +0000, Minas Harutyunyan wrote:
> On 11/5/2021 9:23 PM, John Keeping wrote:
> > UDCs should not enumerate faster than the max_speed set by the gadget
> > driver.  Use this to further restrict the speed set in the DWC2
> > parameters so that the device will not connect faster than is supported
> > by the gadget driver.
> > 
> > For configfs-based composite devices this can be set via the max_speed
> > configfs file.
> > 
> > Signed-off-by: John Keeping <john@...anate.com>
> 
> Acked-by: Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>

Actually, this isn't needed following commit 5324bad66f09 ("usb: dwc2:
gadget: implement udc_set_speed()") - I should have tested on something
more recent than 5.10.

There are still some problems in this area for dwc2 platforms that do
not support high-speed, but this patch is not the fix for them.  Please
drop this.


Sorry for the noise,
John


> > ---
> >   drivers/usb/dwc2/gadget.c | 18 +++++++++++++++++-
> >   1 file changed, 17 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> > index 744539b78f6c..1f39c2f1be8e 100644
> > --- a/drivers/usb/dwc2/gadget.c
> > +++ b/drivers/usb/dwc2/gadget.c
> > @@ -3377,6 +3377,7 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
> >   	u32 val;
> >   	u32 usbcfg;
> >   	u32 dcfg = 0;
> > +	u8 speed;
> >   	int ep;
> >   
> >   	/* Kill any ep0 requests as controller will be reinitialized */
> > @@ -3418,7 +3419,22 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
> >   
> >   	dcfg |= DCFG_EPMISCNT(1);
> >   
> > -	switch (hsotg->params.speed) {
> > +	speed = hsotg->params.speed;
> > +	if (hsotg->driver) {
> > +		switch (hsotg->driver->max_speed) {
> > +		case USB_SPEED_LOW:
> > +			speed = DWC2_SPEED_PARAM_LOW;
> > +			break;
> > +		case USB_SPEED_FULL:
> > +			if (speed != USB_SPEED_LOW)
> > +				speed = DWC2_SPEED_PARAM_FULL;
> > +			break;
> > +		default:
> > +			break;
> > +		}
> > +	}
> > +
> > +	switch (speed) {
> >   	case DWC2_SPEED_PARAM_LOW:
> >   		dcfg |= DCFG_DEVSPD_LS;
> >   		break;
> > 
>