From: Christian Kellermann <ck@xxxxxxxxx>
bMaxPacketSize specifies the maximum packet size for this endpoint in
bytes. According to usb spec valid values are 8, 16, 32, 64.
Without the patch the g_printer driver will fail the USB consortium's
Chapter 9 conformity test suite. A value from the set above needs to
be set.
For the printer device choosing the maximum value has been choosen to
reduce overhead for data transfers.
Signed-off-by: Christian Kellermann <ck@xxxxxxxxx>
Signed-off-by: Fabian Godehardt <fg@xxxxxxxxx>
---
drivers/usb/gadget/printer.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index a341dde..9f6be75 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -234,6 +234,7 @@ static struct usb_device_descriptor device_desc = {
.iManufacturer = STRING_MANUFACTURER,
.iProduct = STRING_PRODUCT,
.iSerialNumber = STRING_SERIALNUM,
+ .bMaxPacketSize0 = 0x40,
.bNumConfigurations = 1
};
--
1.7.5
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