On Tue, Nov 12, 2024, Krishna Kurapati wrote: > Currently if the maximum-speed is set to Super Speed for a 3.1 Gen2 > capable controller, the FORCE_GEN1 bit of LLUCTL register is set only > for one SuperSpeed port (or the first port) present. Modify the logic > to set the FORCE_GEN1 bit for all ports if speed is being limited to > Gen-1. > > Suggested-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> > Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx> > --- > Suggestion provided for the same at: > https://urldefense.com/v3/__https://lore.kernel.org/all/20230517003037.i7hsg6k5fn4eyvgf@xxxxxxxxxxxx/__;!!A4F2R9G_pg!fxCYcGdwDaswO2QMGmJYPI2jJqusyiLy8LzeNmE9bgPoDMrwtEAjAIcGoKkQNUsuEF2ktPxCcoMawo3sSxCJBmlslgVv9g$ > > This patch has only been compile tested due to unavailability of > hardware at the moment. > > drivers/usb/dwc3/core.c | 10 +++++++--- > drivers/usb/dwc3/core.h | 2 +- > 2 files changed, 8 insertions(+), 4 deletions(-) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index 9b888d33e64d..67aefdbe1d5f 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -1470,9 +1470,13 @@ static int dwc3_core_init(struct dwc3 *dwc) > if (hw_mode != DWC3_GHWPARAMS0_MODE_GADGET && > (DWC3_IP_IS(DWC31)) && > dwc->maximum_speed == USB_SPEED_SUPER) { > - reg = dwc3_readl(dwc->regs, DWC3_LLUCTL); > - reg |= DWC3_LLUCTL_FORCE_GEN1; > - dwc3_writel(dwc->regs, DWC3_LLUCTL, reg); > + int i; > + > + for (i = 0; i < dwc->num_usb3_ports; i++) { > + reg = dwc3_readl(dwc->regs, DWC3_LLUCTL(i)); > + reg |= DWC3_LLUCTL_FORCE_GEN1; > + dwc3_writel(dwc->regs, DWC3_LLUCTL(i), reg); > + } > } > > return 0; > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h > index eaa55c0cf62f..296cbe85a494 100644 > --- a/drivers/usb/dwc3/core.h > +++ b/drivers/usb/dwc3/core.h > @@ -179,7 +179,7 @@ > #define DWC3_OEVTEN 0xcc0C > #define DWC3_OSTS 0xcc10 > > -#define DWC3_LLUCTL 0xd024 > +#define DWC3_LLUCTL(n) (0xd024 + ((n) * 0x80)) > > /* Bit fields */ > > -- > 2.34.1 > Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Thanks, Thinh
