Port of Linux patch https://patchwork.kernel.org/patch/10766235/
The HW can swap the USB differential-pair (D+/D-) for each port
separately. So the USB signals can be re-aligned with a misplaced
USB connector on the PCB.
Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
Reviewed-by: Richard Leitner <richard.leit...@skidata.com>
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
---
drivers/usb/misc/usb251xb.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index 0b721f6d4..97f55efa8 100644
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -340,12 +340,14 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
struct device_d *dev = hub->dev;
struct device_node *np = dev->device_node;
int len, err, i;
- u32 property_u32 = 0;
+ u32 port, property_u32 = 0;
const u32 *cproperty_u32;
const char *cproperty_char;
enum of_gpio_flags of_flags;
unsigned long flags = GPIOF_OUT_INIT_ACTIVE;
char str[USB251XB_STRING_BUFSIZE / 2];
+ struct property *prop;
+ const __be32 *p;
if (!np) {
dev_err(dev, "failed to get ofdata\n");
@@ -556,6 +558,16 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
(wchar_t *)hub->serial,
USB251XB_STRING_BUFSIZE);
+ /*
+ * The datasheet documents the register as 'Port Swap' but the register
+ * controls the USB DP/DM signal swapping
+ */
+ hub->port_swap = USB251XB_DEF_PORT_SWAP;
+ of_property_for_each_u32(np, "swap-dx-lanes", prop, p, port) {
+ if ((port >= 0) && (port <= data->port_cnt))
+ hub->port_swap |= BIT(port);
+ }
+
/* The following parameters are currently not exposed to devicetree, but
* may be as soon as needed.
*/
@@ -563,7 +575,6 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
hub->boost_up = USB251XB_DEF_BOOST_UP;
hub->boost_57 = USB251XB_DEF_BOOST_57;
hub->boost_14 = USB251XB_DEF_BOOST_14;
- hub->port_swap = USB251XB_DEF_PORT_SWAP;
hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
hub->port_map56 = USB251XB_DEF_PORT_MAP_56;
--
2.20.1
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