diff options
| author | Jay Cheng <jacheng@nvidia.com> | 2011-06-10 16:50:15 -0400 |
|---|---|---|
| committer | Niket Sirsi <nsirsi@nvidia.com> | 2011-06-22 11:42:15 -0700 |
| commit | 5f6c159f73520b187a58cdc1235e5e31d204ca1a (patch) | |
| tree | 1dff84a681fbabbca5632b7b00839a12e7d21fbe /drivers/usb | |
| parent | bdcc03f4e1fbaf2c8624a61536b7434185da7af6 (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
Reviewed-on: http://git-master/r/36157
(cherry picked from commit bf623c5edbc8f0f5b23d5580aea1038418893792)
Change-Id: I1f48dd3906a7f18208b4415a20c3c166d2a88252
Reviewed-on: http://git-master/r/37020
Tested-by: Cho-Che Cheng <jacheng@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: Rakesh Bodla <rbodla@nvidia.com>
Diffstat (limited to 'drivers/usb')
| -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 717d89c986e2..de42fbb978f4 100644 --- a/drivers/usb/gadget/fsl_usb2_udc.h +++ b/drivers/usb/gadget/fsl_usb2_udc.h @@ -548,7 +548,11 @@ 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 |