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Commit daf5822f authored by Sonic Zhang's avatar Sonic Zhang Committed by Greg Kroah-Hartman
Browse files

USB: musb: add notes for Blackfin anomalies 



Add some helpful notes about how the driver works around different
anomalies that exist in the on-chip host controller.

Signed-off-by: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarCliff Cai <cliff.cai@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarAnand Gadiyar <gadiyar@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1c47cb01

drivers/usb/musb/blackfin.h

+27 −0
Original line number Diff line number Diff line
@@ -14,6 +14,33 @@ 
 * Blackfin specific definitions

 */



/* Anomalies notes:

 *

 *  05000450 - USB DMA Mode 1 Short Packet Data Corruption:

 *             MUSB driver is designed to transfer buffer of N * maxpacket size

 *             in DMA mode 1 and leave the rest of the data to the next

 *             transfer in DMA mode 0, so we never transmit a short packet in

 *             DMA mode 1.

 *

 *  05000463 - This anomaly doesn't affect this driver since it

 *             never uses L1 or L2 memory as data destination.

 *

 *  05000464 - This anomaly doesn't affect this driver since it

 *             never uses L1 or L2 memory as data source.

 *

 *  05000465 - The anomaly can be seen when SCLK is over 100 MHz, and there is

 *             no way to workaround for bulk endpoints.  Since the wMaxPackSize

 *             of bulk is less than or equal to 512, while the fifo size of

 *             endpoint 5, 6, 7 is 1024, the double buffer mode is enabled

 *             automatically when these endpoints are used for bulk OUT.

 *

 *  05000466 - This anomaly doesn't affect this driver since it never mixes

 *             concurrent DMA and core accesses to the TX endpoint FIFOs.

 *

 *  05000467 - The workaround for this anomaly will introduce another

 *             anomaly - 05000465.

 */



#undef DUMP_FIFO_DATA

#ifdef DUMP_FIFO_DATA

static void dump_fifo_data(u8 *buf, u16 len)