Re: [RFC v4 2/5] usb: dwc3: core: Refactor PHY logic to support Multiport Controller

[Thinh Nguyen <Thinh.Nguyen@synopsys.com>]

On Thu, Jan 19, 2023, Thinh Nguyen wrote:
> Hi,
> 
> On Sun, Jan 15, 2023, Krishna Kurapati wrote:
> > Currently the DWC3 driver supports only single port controller
> > which requires at most one HS and one SS PHY.
> 
> Add note here that multi-port is for host mode for clarity.
> 
> > 
> > But the DWC3 USB controller can be connected to multiple ports and
> > each port can have their own PHYs. Each port of the multiport
> > controller can either be HS+SS capable or HS only capable
> > Proper quantification of them is required to modify GUSB2PHYCFG
> > and GUSB3PIPECTL registers appropriately.
> > 
> > Add support for detecting, obtaining and configuring phy's supported
> > by a multiport controller and limit the max number of ports
> > supported to 4.
> > 
> > Signed-off-by: Harsh Agarwal <quic_harshq@quicinc.com>
> > Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
> > ---
> >  drivers/usb/dwc3/core.c | 304 +++++++++++++++++++++++++++++-----------
> >  drivers/usb/dwc3/core.h |  15 +-
> >  drivers/usb/dwc3/drd.c  |  14 +-
> >  3 files changed, 244 insertions(+), 89 deletions(-)
> > 
> > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> > index 476b63618511..7e0a9a598dfd 100644
> > --- a/drivers/usb/dwc3/core.c
> > +++ b/drivers/usb/dwc3/core.c
> > @@ -120,7 +120,7 @@ static void __dwc3_set_mode(struct work_struct *work)
> >  {
> >  	struct dwc3 *dwc = work_to_dwc(work);
> >  	unsigned long flags;
> > -	int ret;
> > +	int ret, i;
> 
> Can we declare variables in separate lines here and other places.
> 
> >  	u32 reg;
> >  	u32 desired_dr_role;
> >  
> > @@ -200,8 +200,10 @@ static void __dwc3_set_mode(struct work_struct *work)
> >  		} else {
> >  			if (dwc->usb2_phy)
> >  				otg_set_vbus(dwc->usb2_phy->otg, true);
> > -			phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
> > -			phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
> > +			for (i = 0; i < dwc->num_ports; i++) {

BTW, is num_ports the total of usb2 + usb3 ports?

> > +				phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST);
> > +				phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST);
> > +			}
> >  			if (dwc->dis_split_quirk) {

Thanks,
Thinh