diff -Naur linux-2.6.20.6/Documentation/usb/bulk_tx_hacks.txt linux-2.6.20.6_jca/Documentation/usb/bulk_tx_hacks.txt --- linux-2.6.20.6/Documentation/usb/bulk_tx_hacks.txt 1969-12-31 19:00:00.000000000 -0500 +++ linux-2.6.20.6_jca/Documentation/usb/bulk_tx_hacks.txt 2007-04-13 09:59:19.000000000 -0400 @@ -0,0 +1,28 @@ +bulk_tx_hacks.txt +Copyright (C) 2007 Jeremy C. Andrus +Started: 2007-April-13 + + +How to use a 1024-byte bulk transfer packet + +There are some devices/companies which have decided to use +a bulk transfer packet size which is larger than the maximum +specified in the USB spec. Because I was interested in using +such a device, I found it necessary to devise a way to allow +this functionality in the linux kernel. + +It is reasonably simple to create a 1024-byte bulk transfer +URB. Simply OR the 'URB_1024_BYTE_PKT' value into the URB's +transfer_flags field before submitting it to the system: + + urb = usb_alloc_urb(0, GFP_KERNEL); + + usb_fill_bulk_urb( urb, ... ); + + /* this allows the URB's buffer to be 1024 bytes */ + urb->transfer_flags |= URB_1024_BYTE_PKT; + + retval = usb_submit_urb( urb, GFP_KERNEL ); + + usb_free_urb( urb ); + diff -Naur linux-2.6.20.6/drivers/usb/host/Kconfig linux-2.6.20.6_jca/drivers/usb/host/Kconfig --- linux-2.6.20.6/drivers/usb/host/Kconfig 2007-04-06 16:02:48.000000000 -0400 +++ linux-2.6.20.6_jca/drivers/usb/host/Kconfig 2007-04-13 10:00:36.000000000 -0400 @@ -67,6 +67,20 @@ If unsure, say N. +config USB_EHCI_1024BYTE_BULK_PKTS + bool "Allow 1024-byte packets in Bulk Transfer mode" + depends on USB_EHCI_HCD && EXPERIMENTAL + ---help--- + The USB specification allows a maximum bulk transfer packet size + of 512 bytes. There are a few devices which have decided to break + this specification and use 1024 byte packets. This option allows + the use of the larger packet size with a very specific flag set + in the URB. + + See the Documentation/usb/bulk_tx_hacks.txt file for details. + + If unsure, say N. + config USB_ISP116X_HCD tristate "ISP116X HCD support" depends on USB diff -Naur linux-2.6.20.6/drivers/usb/host/ehci-q.c linux-2.6.20.6_jca/drivers/usb/host/ehci-q.c --- linux-2.6.20.6/drivers/usb/host/ehci-q.c 2007-04-06 16:02:48.000000000 -0400 +++ linux-2.6.20.6_jca/drivers/usb/host/ehci-q.c 2007-04-13 09:47:09.000000000 -0400 @@ -751,7 +751,12 @@ info2 |= (EHCI_TUNE_MULT_HS << 30); } else if (type == PIPE_BULK) { info1 |= (EHCI_TUNE_RL_HS << 28); - info1 |= 512 << 16; /* usb2 fixed maxpacket */ +#ifdef USB_EHCI_1024BYTE_BULK_PKTS + if ( urb->transfer_flags & URB_1024_BYTE_PKT ) + info1 |= 1024 << 16; /* HACK for Micron Dev Kits requiring 1024 byte packets... */ + else +#endif + info1 |= 512 << 16; /* usb2 fixed maxpacket */ info2 |= (EHCI_TUNE_MULT_HS << 30); } else { /* PIPE_INTERRUPT */ info1 |= max_packet (maxp) << 16; diff -Naur linux-2.6.20.6/include/linux/usb.h linux-2.6.20.6_jca/include/linux/usb.h --- linux-2.6.20.6/include/linux/usb.h 2007-04-06 16:02:48.000000000 -0400 +++ linux-2.6.20.6_jca/include/linux/usb.h 2007-04-13 09:47:09.000000000 -0400 @@ -904,6 +904,9 @@ #define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */ #define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt * needed */ +#ifdef USB_EHCI_1024BYTE_BULK_PKTS +#define URB_1024_BYTE_PKT 0x8000 /* Use a max packet length of 1024 bytes instead of 512 */ +#endif struct usb_iso_packet_descriptor { unsigned int offset;