On Wed, 2019-05-15 at 18:20 -0400, Gaël PORTAY wrote: > From: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> > > The OTG disconnection event is generated after the presence/absence of > an ID connection, but some platforms don't have the ID pin connected, so > the event is not generated. In such case, for detecting the > disconnection event, we can get the cable state from an extcon driver. > We need, though, to force to set the B-Device Session Valid bit on the > PHY to have the device respond to the setup address. Otherwise, the > following error is shown: > > usb 2-2: Device not responding to setup address. > usb 2-2: device not accepting address 14, error -71 > usb usb2-port2: unable to enumerate USB device > > The patch tells the PHY to force the B-Device Session Valid bit when the > OTG role is device and clear that bit if the OTG role is host, when an > extcon is available. > > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> > Signed-off-by: Gaël PORTAY <gael.portay@xxxxxxxxxxxxx> > --- > > Hi all, > > The main purpose of this patch is have the Type-C port on the Samsung > Chromebook Plus work as a device or in OTG mode. > > That patch was originally a part of that patchset[1]; all other patches > was merged recently in master. > > The patch was tested on a Samsung Chromebook Plus by configuring one > port to work as device, configure a cdc ethernet gadget and communicate > via ethernet gadget my workstation with the chromebook through a usb-a > to type-c cable. > > Best regards, > Gaël > > [1]: https://lkml.org/lkml/2018/8/15/141 > > Changes since v1: > - [PATCH 3/4] Remove introduction of dt property "rockchip,force-bvalid" > and replace cable state using extcon instead (if set). > > drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 51 +++++++++++++++++++ > 1 file changed, 51 insertions(+) > > diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c > index ba07121c3eff..5e9d50b5ae16 100644 > --- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c > +++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c > @@ -125,6 +125,7 @@ struct rockchip_chg_det_reg { > * @bvalid_det_en: vbus valid rise detection enable register. > * @bvalid_det_st: vbus valid rise detection status register. > * @bvalid_det_clr: vbus valid rise detection clear register. > + * @bvalid_session: force B-device session valid register. > * @ls_det_en: linestate detection enable register. > * @ls_det_st: linestate detection state register. > * @ls_det_clr: linestate detection clear register. > @@ -138,6 +139,7 @@ struct rockchip_usb2phy_port_cfg { > struct usb2phy_reg bvalid_det_en; > struct usb2phy_reg bvalid_det_st; > struct usb2phy_reg bvalid_det_clr; > + struct usb2phy_reg bvalid_session; > struct usb2phy_reg ls_det_en; > struct usb2phy_reg ls_det_st; > struct usb2phy_reg ls_det_clr; > @@ -169,6 +171,7 @@ struct rockchip_usb2phy_cfg { > * @port_id: flag for otg port or host port. > * @suspended: phy suspended flag. > * @vbus_attached: otg device vbus status. > + * @force_bvalid: force the control of the B-device session valid bit. > * @bvalid_irq: IRQ number assigned for vbus valid rise detection. > * @ls_irq: IRQ number assigned for linestate detection. > * @otg_mux_irq: IRQ number which multiplex otg-id/otg-bvalid/linestate > @@ -187,6 +190,7 @@ struct rockchip_usb2phy_port { > unsigned int port_id; > bool suspended; > bool vbus_attached; > + bool force_bvalid; > int bvalid_irq; > int ls_irq; > int otg_mux_irq; > @@ -553,6 +557,13 @@ static void rockchip_usb2phy_otg_sm_work(struct work_struct *work) > switch (rport->state) { > case OTG_STATE_UNDEFINED: > rport->state = OTG_STATE_B_IDLE; > + if (rport->force_bvalid) { > + property_enable(rphy->grf, > + &rport->port_cfg->bvalid_session, > + true); > + dev_dbg(&rport->phy->dev, > + "set the B-Device Session Valid\n"); > + } > if (!vbus_attach) > rockchip_usb2phy_power_off(rport->phy); > /* fall through */ > @@ -560,6 +571,14 @@ static void rockchip_usb2phy_otg_sm_work(struct work_struct *work) > if (extcon_get_state(rphy->edev, EXTCON_USB_HOST) > 0) { > dev_dbg(&rport->phy->dev, "usb otg host connect\n"); > rport->state = OTG_STATE_A_HOST; > + /* When leaving device mode force end the session */ > + if (rport->force_bvalid) { > + property_enable(rphy->grf, > + &rport->port_cfg->bvalid_session, > + false); > + dev_dbg(&rport->phy->dev, > + "clear the B-Device Session Valid\n"); > + } > rockchip_usb2phy_power_on(rport->phy); > return; > } else if (vbus_attach) { > @@ -634,6 +653,14 @@ static void rockchip_usb2phy_otg_sm_work(struct work_struct *work) > if (extcon_get_state(rphy->edev, EXTCON_USB_HOST) == 0) { > dev_dbg(&rport->phy->dev, "usb otg host disconnect\n"); > rport->state = OTG_STATE_B_IDLE; > + /* When leaving host mode force start the session */ > + if (rport->force_bvalid) { > + property_enable(rphy->grf, > + &rport->port_cfg->bvalid_session, > + true); > + dev_dbg(&rport->phy->dev, > + "set the B-Device Session Valid\n"); > + } > rockchip_usb2phy_power_off(rport->phy); > } > break; > @@ -1016,6 +1043,28 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy, > INIT_DELAYED_WORK(&rport->chg_work, rockchip_chg_detect_work); > INIT_DELAYED_WORK(&rport->otg_sm_work, rockchip_usb2phy_otg_sm_work); > > + /* > + * Some platforms doesn't have the ID pin connected to the phy, hence > + * the OTD ID event is not generated, but in some cases we can get the > + * cable state from an extcon driver. In such case we can force to set > + * the B-Device Session Valid bit on the PHY to have the device working > + * as a OTG. > + */ > + if (rphy->edev) { > + /* > + * Check if bvalid_session register is set in the structure > + * rockchip_usb2phy_cfg for this SoC. > + */ > + if (rport->port_cfg->bvalid_session.offset == 0x0) { > + rport->force_bvalid = false; > + dev_err(rphy->dev, > + "cannot force B-device session, the register is not set for that SoC\n"); > + } else { > + rport->force_bvalid = true; > + dev_info(rphy->dev, "force B-device session enabled\n"); > + } > + } > + > /* > * Some SoCs use one interrupt with otg-id/otg-bvalid/linestate > * interrupts muxed together, so probe the otg-mux interrupt first, > @@ -1338,6 +1387,7 @@ static const struct rockchip_usb2phy_cfg rk3399_phy_cfgs[] = { > .bvalid_det_en = { 0xe3c0, 3, 3, 0, 1 }, > .bvalid_det_st = { 0xe3e0, 3, 3, 0, 1 }, > .bvalid_det_clr = { 0xe3d0, 3, 3, 0, 1 }, > + .bvalid_session = { 0x4498, 4, 4, 0, 1 }, > .utmi_avalid = { 0xe2ac, 7, 7, 0, 1 }, > .utmi_bvalid = { 0xe2ac, 12, 12, 0, 1 }, > }, > @@ -1373,6 +1423,7 @@ static const struct rockchip_usb2phy_cfg rk3399_phy_cfgs[] = { > .bvalid_det_en = { 0xe3c0, 8, 8, 0, 1 }, > .bvalid_det_st = { 0xe3e0, 8, 8, 0, 1 }, > .bvalid_det_clr = { 0xe3d0, 8, 8, 0, 1 }, > + .bvalid_session = { 0x4518, 4, 4, 0, 1 }, > .utmi_avalid = { 0xe2ac, 10, 10, 0, 1 }, > .utmi_bvalid = { 0xe2ac, 16, 16, 0, 1 }, > }, > -- > 2.21.0 > > It's been more than a month without any activity here. Any news? Thanks, Ezequiel _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
