diff options
Diffstat (limited to 'drivers/usb/gadget/mv_udc.c')
| -rw-r--r-- | drivers/usb/gadget/mv_udc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/gadget/mv_udc.c b/drivers/usb/gadget/mv_udc.c index bbf4418a2e..1ead2f2459 100644 --- a/drivers/usb/gadget/mv_udc.c +++ b/drivers/usb/gadget/mv_udc.c @@ -21,6 +21,16 @@ #error This driver only supports one single controller. #endif +/* + * Check if the system has too long cachelines. If the cachelines are + * longer then 128b, the driver will not be able flush/invalidate data + * cache over separate QH entries. We use 128b because one QH entry is + * 64b long and there are always two QH list entries for each endpoint. + */ +#if ARCH_DMA_MINALIGN > 128 +#error This driver can not work on systems with caches longer than 128b +#endif + #ifndef DEBUG #define DBG(x...) do {} while (0) #else |