Re: [PATCH 1/3] phy: sun4i-usb: support automatically switch PHY0 route to MUSB/HCI

[Hans de Goede]

Hi,

On 28-02-17 16:27, Icenowy Zheng wrote:
> On newer Allwinner SoCs (H3 and after), the PHY0 node is routed to both
> MUSB controller for peripheral and host support (the host support is
> slightly broken), and a pair of EHCI/OHCI controllers, which provide a
> better support for host mode.
>
> Add support for automatically switch the route of PHY0 according to the
> status of dr_mode and id det pin.
>
> Only H3 have this function enabled in this patch, as further SoCs will
> be tested later and then have it enabled.
>
> Signed-off-by: Icenowy Zheng <icenowy@xxxxxxxx>
> ---
>  drivers/phy/phy-sun4i-usb.c | 55 +++++++++++++++++++++++++++++++--------------
>  1 file changed, 38 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
> index a21b5f24a340..8b91afe8f42d 100644
> --- a/drivers/phy/phy-sun4i-usb.c
> +++ b/drivers/phy/phy-sun4i-usb.c
> @@ -49,12 +49,14 @@
>  #define REG_PHYBIST			0x08
>  #define REG_PHYTUNE			0x0c
>  #define REG_PHYCTL_A33			0x10
> -#define REG_PHY_UNK_H3			0x20
> +#define REG_PHY_OTGCTL			0x20
>
>  #define REG_PMU_UNK1			0x10
>
>  #define PHYCTL_DATA			BIT(7)
>
> +#define OTGCTL_ROUTE_MUSB		BIT(0)
> +
>  #define SUNXI_AHB_ICHR8_EN		BIT(10)
>  #define SUNXI_AHB_INCR4_BURST_EN	BIT(9)
>  #define SUNXI_AHB_INCRX_ALIGN_EN	BIT(8)
> @@ -110,6 +112,7 @@ struct sun4i_usb_phy_cfg {
>  	u8 phyctl_offset;
>  	bool dedicated_clocks;
>  	bool enable_pmu_unk1;
> +	bool phy0_dual_route;
>  };
>
>  struct sun4i_usb_phy_data {
> @@ -271,23 +274,16 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>  		writel(val & ~2, phy->pmu + REG_PMU_UNK1);
>  	}
>
> -	if (data->cfg->type == sun8i_h3_phy) {
> -		if (phy->index == 0) {
> -			val = readl(data->base + REG_PHY_UNK_H3);
> -			writel(val & ~1, data->base + REG_PHY_UNK_H3);
> -		}
> -	} else {
> -		/* Enable USB 45 Ohm resistor calibration */
> -		if (phy->index == 0)
> -			sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
> +	/* Enable USB 45 Ohm resistor calibration */
> +	if (phy->index == 0)
> +		sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
>
> -		/* Adjust PHY's magnitude and rate */
> -		sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
> +	/* Adjust PHY's magnitude and rate */
> +	sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
>
> -		/* Disconnect threshold adjustment */
> -		sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL,
> -				    data->cfg->disc_thresh, 2);
> -	}
> +	/* Disconnect threshold adjustment */
> +	sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL,
> +			    data->cfg->disc_thresh, 2);
>
>  	sun4i_usb_phy_passby(phy, 1);
>
> @@ -486,6 +482,26 @@ static const struct phy_ops sun4i_usb_phy_ops = {
>  	.owner		= THIS_MODULE,
>  };
>
> +static void sun4i_usb_phy0_reroute(struct sun4i_usb_phy_data *data, int id_det)
> +{
> +	u32 regval;
> +
> +	if (data->dr_mode == USB_DR_MODE_HOST)
> +		id_det = 0; /* Force host */
> +	if (data->dr_mode == USB_DR_MODE_PERIPHERAL)
> +		id_det = 1; /* Force peripheral*/

The passed in id_det comes from sun4i_usb_phy0_get_id_det() which already
does:

        switch (data->dr_mode) {
        case USB_DR_MODE_OTG:
                if (data->id_det_gpio)
                        return gpiod_get_value_cansleep(data->id_det_gpio);
                else
                        return 1; /* Fallback to peripheral mode */
        case USB_DR_MODE_HOST:
                return 0;
        case USB_DR_MODE_PERIPHERAL:
        default:
                return 1;
        }

So the above 4 lines are unnecessary and should be removed.

Otherwise looks good, thank you for doing this.

Regards,

Hans



> +
> +	regval = readl(data->base + REG_PHY_OTGCTL);
> +	if (id_det == 0) {
> +		/* Host mode. Route phy0 to EHCI/OHCI */
> +		regval &= ~OTGCTL_ROUTE_MUSB;
> +	} else {
> +		/* Peripheral mode. Route phy0 to MUSB */
> +		regval |= OTGCTL_ROUTE_MUSB;
> +	}
> +	writel(regval, data->base + REG_PHY_OTGCTL);
> +}
> +
>  static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
>  {
>  	struct sun4i_usb_phy_data *data =
> @@ -511,6 +527,10 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
>  	data->force_session_end = false;
>
>  	if (id_det != data->id_det) {
> +		/* Re-route PHY0 if necessary */
> +		if (data->cfg->phy0_dual_route)
> +			sun4i_usb_phy0_reroute(data, id_det);
> +
>  		/* id-change, force session end if we've no vbus detection */
>  		if (data->dr_mode == USB_DR_MODE_OTG &&
>  		    !sun4i_usb_phy0_have_vbus_det(data))
> @@ -700,7 +720,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  			return PTR_ERR(phy->reset);
>  		}
>
> -		if (i) { /* No pmu for usbc0 */
> +		if (i || data->cfg->phy0_dual_route) { /* No pmu for musb */
>  			snprintf(name, sizeof(name), "pmu%d", i);
>  			res = platform_get_resource_byname(pdev,
>  							IORESOURCE_MEM, name);
> @@ -825,6 +845,7 @@ static const struct sun4i_usb_phy_cfg sun8i_h3_cfg = {
>  	.disc_thresh = 3,
>  	.dedicated_clocks = true,
>  	.enable_pmu_unk1 = true,
> +	.phy0_dual_route = true,
>  };
>
>  static const struct sun4i_usb_phy_cfg sun8i_v3s_cfg = {