diff options
| author | Jay Cheng <jacheng@nvidia.com> | 2011-06-10 16:50:15 -0400 |
|---|---|---|
| committer | Rohan Somvanshi <rsomvanshi@nvidia.com> | 2011-06-14 04:28:48 -0700 |
| commit | bf623c5edbc8f0f5b23d5580aea1038418893792 (patch) | |
| tree | f570d873289ca979634ab45285e723d91f572d24 | |
| parent | 1ffaaac2463f94ad1056abfa345f6e50249ec1c4 (diff) | |
ARM: tegra: usb: prefetch engine buffer coherency protection
The prefetcher fetches a total of 128 bytes, and then responding to
sequential reads with this prefetched data. To avoid coherency issues,
it discards the prefetched data if a non sequential read occurs.
Allocate dtd with 128 bytes boundary to make 2 consecutive dtd 128 bytes
apart.
bug 825970
Change-Id: I5ab066d8535cf719b5ed830293a883609180b525
Reviewed-on: http://git-master/r/36157
Tested-by: Cho-Che Cheng <jacheng@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: Rakesh Bodla <rbodla@nvidia.com>
| -rw-r--r-- | drivers/usb/gadget/fsl_usb2_udc.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/gadget/fsl_usb2_udc.h b/drivers/usb/gadget/fsl_usb2_udc.h index 19d113c03af6..415b7c088962 100644 --- a/drivers/usb/gadget/fsl_usb2_udc.h +++ b/drivers/usb/gadget/fsl_usb2_udc.h @@ -428,7 +428,11 @@ struct ep_td_struct { DTD_STATUS_DATA_BUFF_ERR | \ DTD_STATUS_TRANSACTION_ERR) /* Alignment requirements; must be a power of two */ +#if defined(CONFIG_ARCH_TEGRA) +#define DTD_ALIGNMENT 0x80 +#else #define DTD_ALIGNMENT 0x20 +#endif #define QH_ALIGNMENT 2048 #define QH_OFFSET 0x1000 |