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Date: Wed, 26 Jun 2019 12:32:55 -0300
From: Ezequiel Garcia <ezequiel@...labora.com>
To: Gaël PORTAY <gael.portay@...labora.com>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org
Cc: Kishon Vijay Abraham I <kishon@...com>,
Heiko Stuebner <heiko@...ech.de>,
Enric Balletbo i Serra <enric.balletbo@...labora.com>,
kernel@...labora.com
Subject: Re: [PATCH v2] phy: rockchip-inno-usb2: allow to force the B-Device
Session Valid bit.
On Wed, 2019-05-15 at 18:20 -0400, Gaël PORTAY wrote:
> From: Enric Balletbo i Serra <enric.balletbo@...labora.com>
>
> 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@...labora.com>
> Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>
> ---
>
> 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
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