diff options
| author | James Wylder <james.wylder@motorola.com> | 2011-06-21 15:30:40 -0500 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:37:11 -0800 |
| commit | 4c60eaf231b72ceaa79eefa2eab1e5a58a357034 (patch) | |
| tree | 20a5f3e34edff122f50779cf35ca1edd09157b10 /drivers | |
| parent | ea4f838a14719522af96b3101fbd17638833a373 (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.
Submitted on behalf of Jay Cheng <jacheng@nvidia.com>
Change-Id: I2adc02c2ac7901d0617b487cb498a34ec7a63e18
Signed-off-by: James Wylder <james.wylder@motorola.com>
Diffstat (limited to 'drivers')
| -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 bb10c5f6924f..74dba97ec5b9 100644 --- a/drivers/usb/gadget/fsl_usb2_udc.h +++ b/drivers/usb/gadget/fsl_usb2_udc.h @@ -430,7 +430,11 @@ 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 |