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| author |   Sonic Zhang <sonic.zhang@analog.com> | 2009-11-16 19:13:08 +0530 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-11 11:55:24 -0800 |
| commit | daf5822f05397623c6d2376748c7965707cf8ef8 (patch) | |
| tree | f13dce99fa38713bd1c9f623c9cbce01e40763d6 /drivers/usb | |
| parent | USB: musb: update Blackfin processor dependency (diff) | |
| download | linux-dev-daf5822f05397623c6d2376748c7965707cf8ef8.tar.xz linux-dev-daf5822f05397623c6d2376748c7965707cf8ef8.zip | |
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: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/musb/blackfin.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/usb/musb/blackfin.h b/drivers/usb/musb/blackfin.h index a240c1e53d16..b49a362fb9fa 100644 --- a/drivers/usb/musb/blackfin.h +++ b/drivers/usb/musb/blackfin.h @@ -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) |