2018-01-12 11:08 GMT+01:00 William Wu <william.wu@xxxxxxxxxxxxxx>:
> According to the RK3399 TRM, for Type-C USB start-up sequence,
> we need to hold the whole USB 3.0 OTG controller in reset state
> to keep the PIPE power state in P2 while initializing PHY. This
> is because when initialize the Type-C PHY for USB3, we need to
> configure the PHY and PMA for the selected mode of operation,
> and wait for the PMA and PIPE ready, if the USB3 OTG controller
> isn't in P2 state, it may cause waiting timeout.
>
> Without this patch, waiting for the PMA and PIPE ready timeout
> issue easily happens when we shutdown the Logic on RK3399 and
> do the suspend/resume stress test.
>
> Signed-off-by: William Wu <william.wu@xxxxxxxxxxxxxx>
> ---
> drivers/phy/rockchip/phy-rockchip-typec.c | 22 ++++++++++++++++++++--
> 1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/phy/rockchip/phy-rockchip-typec.c b/drivers/phy/rockchip/phy-rockchip-typec.c
> index ee85fa0..68a5840 100644
> --- a/drivers/phy/rockchip/phy-rockchip-typec.c
> +++ b/drivers/phy/rockchip/phy-rockchip-typec.c
> @@ -372,6 +372,7 @@ struct rockchip_typec_phy {
> struct reset_control *uphy_rst;
> struct reset_control *pipe_rst;
> struct reset_control *tcphy_rst;
> + struct reset_control *otg_rst;
> struct rockchip_usb3phy_port_cfg port_cfgs;
> /* mutex to protect access to individual PHYs */
> struct mutex lock;
> @@ -841,10 +842,16 @@ static int rockchip_usb3_phy_power_on(struct phy *phy)
> if (tcphy->mode == new_mode)
> goto unlock_ret;
>
> + ret = reset_control_assert(tcphy->otg_rst);
> + if (ret < 0) {
> + dev_err(tcphy->dev, "failed to assert otg reset: %d\n", ret);
> + goto unlock_ret;
> + }
> +
> if (tcphy->mode == MODE_DISCONNECT) {
> ret = tcphy_phy_init(tcphy, new_mode);
> if (ret)
> - goto unlock_ret;
> + goto unlock_deassert;
> }
>
> /* wait TCPHY for pipe ready */
> @@ -852,7 +859,7 @@ static int rockchip_usb3_phy_power_on(struct phy *phy)
> regmap_read(tcphy->grf_regs, reg->offset, &val);
> if (!(val & BIT(reg->enable_bit))) {
> tcphy->mode |= new_mode & (MODE_DFP_USB | MODE_UFP_USB);
> - goto unlock_ret;
> + goto unlock_deassert;
> }
> usleep_range(10, 20);
> }
> @@ -862,6 +869,11 @@ static int rockchip_usb3_phy_power_on(struct phy *phy)
>
> ret = -ETIMEDOUT;
>
> +unlock_deassert:
> + ret = reset_control_deassert(tcphy->otg_rst);
> + if (ret < 0)
> + dev_err(tcphy->dev, "failed to deassert otg reset: %d\n", ret);
> +
> unlock_ret:
> mutex_unlock(&tcphy->lock);
> return ret;
> @@ -1066,6 +1078,12 @@ static int tcphy_parse_dt(struct rockchip_typec_phy *tcphy,
> return PTR_ERR(tcphy->tcphy_rst);
> }
>
> + tcphy->otg_rst = devm_reset_control_get(dev, "usb3-otg");
> + if (IS_ERR(tcphy->otg_rst)) {
> + dev_err(dev, "no otg_rst reset control found\n");
> + return PTR_ERR(tcphy->otg_rst);
> + }
> +
> return 0;
> }
>
> --
> 2.0.0
>
>
Tested-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
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