usb: usb251xb: Reallow swap-dx-lanes to apply to the upstream port

commit 4849ee6129702dcb05d36f9c7c61b4661fcd751f upstream.

This is a partial revert of 73d31def1aab "usb: usb251xb: Create a ports
field collector method", which broke a existing devicetree
(arch/arm64/boot/dts/freescale/imx8mq.dtsi).

There is no reason why the swap-dx-lanes property should not apply to
the upstream port. The reason given in the breaking commit was that it's
inconsitent with respect to other port properties, but in fact it is not.
All other properties which only apply to the downstream ports explicitly
reject port 0, so there is pretty strong precedence that the driver
referred to the upstream port as port 0. So there is no inconsistency in
this property at all, other than the swapping being also applicable to
the upstream port.

CC: stable@vger.kernel.org #5.2
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Link: https://lore.kernel.org/r/20190719084407.28041-3-l.stach@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index 119aeb658c816550291117a572590c465df45fac..6ca9111d150a34b5fe567cc77e07c2c95c2b470e 100644 (file)
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -375,7 +375,8 @@ out_err:
 
 #ifdef CONFIG_OF
 static void usb251xb_get_ports_field(struct usb251xb *hub,
-                                   const char *prop_name, u8 port_cnt, u8 *fld)
+                                   const char *prop_name, u8 port_cnt,
+                                   bool ds_only, u8 *fld)
 {
        struct device *dev = hub->dev;
        struct property *prop;
@@ -383,7 +384,7 @@ static void usb251xb_get_ports_field(struct usb251xb *hub,
        u32 port;
 
        of_property_for_each_u32(dev->of_node, prop_name, prop, p, port) {
-               if ((port >= 1) && (port <= port_cnt))
+               if ((port >= ds_only ? 1 : 0) && (port <= port_cnt))
                        *fld |= BIT(port);
                else
                        dev_warn(dev, "port %u doesn't exist\n", port);
@@ -501,15 +502,15 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
 
        hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
        usb251xb_get_ports_field(hub, "non-removable-ports", data->port_cnt,
-                                &hub->non_rem_dev);
+                                true, &hub->non_rem_dev);
 
        hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
        usb251xb_get_ports_field(hub, "sp-disabled-ports", data->port_cnt,
-                                &hub->port_disable_sp);
+                                true, &hub->port_disable_sp);
 
        hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
        usb251xb_get_ports_field(hub, "bp-disabled-ports", data->port_cnt,
-                                &hub->port_disable_bp);
+                                true, &hub->port_disable_bp);
 
        hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
        if (!of_property_read_u32(np, "sp-max-total-current-microamp",
@@ -573,7 +574,7 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
         */
        hub->port_swap = USB251XB_DEF_PORT_SWAP;
        usb251xb_get_ports_field(hub, "swap-dx-lanes", data->port_cnt,
-                                &hub->port_swap);
+                                false, &hub->port_swap);
 
        /* The following parameters are currently not exposed to devicetree, but
         * may be as soon as needed.