[PATCH v2] usb: gadget: aspeed_udc: fix device address configuration

[Jeremy Kerr]

In the aspeed UDC setup, we configure the UDC hardware with the assigned
USB device address.

However, we have an off-by-one in the bitmask, so we're only setting the
lower 6 bits of the address (USB addresses being 7 bits, and the
hardware bitmask being bits 0:6).

This means that device enumeration fails if the assigned address is
greater than 64:

[  344.607255] usb 1-1: new high-speed USB device number 63 using ehci-platform
[  344.808459] usb 1-1: New USB device found, idVendor=cc00, idProduct=cc00, bcdDevice= 6.10
[  344.817684] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  344.825671] usb 1-1: Product: Test device
[  344.831075] usb 1-1: Manufacturer: Test vendor
[  344.836335] usb 1-1: SerialNumber: 00
[  349.917181] usb 1-1: USB disconnect, device number 63
[  352.036775] usb 1-1: new high-speed USB device number 64 using ehci-platform
[  352.249432] usb 1-1: device descriptor read/all, error -71
[  352.696740] usb 1-1: new high-speed USB device number 65 using ehci-platform
[  352.909431] usb 1-1: device descriptor read/all, error -71

Use the correct mask of 0x7f (rather than 0x3f), and generate this
through the GENMASK macro, so we have numbers that correspond exactly
to the hardware register definition.

Fixes: 055276c13205 ("usb: gadget: add Aspeed ast2600 udc driver")
Cc: stable at vger.kernel.org
Reviewed-by: Neal Liu <neal_liu at aspeedtech.com>
Reviewed-by: Andrew Jeffery <andrew at codeconstruct.com.au>
Signed-off-by: Jeremy Kerr <jk at codeconstruct.com.au>
---
v2:
- Add Cc: stable@ tag
- v1: https://lore.kernel.org/r/20240612-aspeed-udc-v1-1-d277b553aecf@codeconstruct.com.au
---
 drivers/usb/gadget/udc/aspeed_udc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c
index 3916c8e2ba01..821a6ab5da56 100644
--- a/drivers/usb/gadget/udc/aspeed_udc.c
+++ b/drivers/usb/gadget/udc/aspeed_udc.c
@@ -66,8 +66,8 @@
 #define USB_UPSTREAM_EN			BIT(0)
 
 /* Main config reg */
-#define UDC_CFG_SET_ADDR(x)		((x) & 0x3f)
-#define UDC_CFG_ADDR_MASK		(0x3f)
+#define UDC_CFG_SET_ADDR(x)		((x) & UDC_CFG_ADDR_MASK)
+#define UDC_CFG_ADDR_MASK		GENMASK(6, 0)
 
 /* Interrupt ctrl & status reg */
 #define UDC_IRQ_EP_POOL_NAK		BIT(17)

---
base-commit: 32f88d65f01bf6f45476d7edbe675e44fb9e1d58
change-id: 20240611-aspeed-udc-07dcde062ccf

Best regards,
-- 
Jeremy Kerr <jk at codeconstruct.com.au>