Am Donnerstag, 1. März 2018, 10:24:15 CET schrieb Enric Balletbo i Serra:
> Right now the rockchip typec-phy does fail probing when no extcon is
> detected. Some boards get the cable-state via the extcon interface and
> have this supported, other boards seem to use the fusb302 chip or
> another but the driver currently does not seem to utilize the extcon
> interface to report the cable-state. That's required to detect
> cable-state changes but a missing extcon shouldn't fail to probe,
> instead, should just fall back to working in host-mode if it cannot get
> the extcon.
And of course:
Some boards use no controller at all and just connect the type-c to a
standard USB-A port.
> Fixes: c301b327aea898af ("arm64: dts: rockchip: add usb3-phy otg-port
> support for rk3399") Reported-by: Vicente Bergas <vice...@gmail.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
> ---
>
> drivers/phy/rockchip/phy-rockchip-typec.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/phy/rockchip/phy-rockchip-typec.c
> b/drivers/phy/rockchip/phy-rockchip-typec.c index
> 7492c8978217..3741afab5cd2 100644
> --- a/drivers/phy/rockchip/phy-rockchip-typec.c
> +++ b/drivers/phy/rockchip/phy-rockchip-typec.c
> @@ -782,6 +782,9 @@ static int tcphy_get_mode(struct rockchip_typec_phy
> *tcphy) u8 mode;
> int ret;
>
> + if (!edev)
> + return MODE_DFP_USB;
> +
> ufp = extcon_get_state(edev, EXTCON_USB);
> dp = extcon_get_state(edev, EXTCON_DISP_DP);
>
> @@ -1115,9 +1118,9 @@ static int rockchip_typec_phy_probe(struct
> platform_device *pdev)
>
> tcphy->extcon = extcon_get_edev_by_phandle(dev, 0);
> if (IS_ERR(tcphy->extcon)) {
> - if (PTR_ERR(tcphy->extcon) != -EPROBE_DEFER)
> - dev_err(dev, "Invalid or missing extcon\n");
> - return PTR_ERR(tcphy->extcon);
> + if (PTR_ERR(tcphy->extcon) == -EPROBE_DEFER)
> + return PTR_ERR(tcphy->extcon);
> + tcphy->extcon = NULL;
Do we want to keep a bit of the error handling of extcon, a la
+ if (PTR_ERR(tcphy->extcon) == -ENODEV) {
+ tcphy->extcon = NULL;
+ } else {
+ if (PTR_ERR(tcphy->extcon) != -EPROBE_DEFER)
+ dev_err(dev, "Invalid or extcon\n");
+ return PTR_ERR(tcphy->extcon);
+ }
So only make it NULL, if extcon really reports ENODEV?
Heiko
