From 4849ee6129702dcb05d36f9c7c61b4661fcd751f Mon Sep 17 00:00:00 2001 From: Lucas Stach Date: Fri, 19 Jul 2019 10:44:07 +0200 Subject: [PATCH] usb: usb251xb: Reallow swap-dx-lanes to apply to the upstream port 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 Link: https://lore.kernel.org/r/20190719084407.28041-3-l.stach@pengutronix.de Signed-off-by: Greg Kroah-Hartman --- drivers/usb/misc/usb251xb.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c index 119aeb658c81..6ca9111d150a 100644 --- 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. -- 2.20.1