tree 6a1b8376d0dd924b881132dac78e391f41f5fa27
parent 16b7a29fc6fac16431051de06d62da689360c40a
author Lukasz Majewski <l.majewski@samsung.com> 1391591442 +0100
committer Marek Vasut <marex@denx.de> 1391649765 +0100

usb:udc:samsung: Remove redundant cache operation from Samsung UDC driver

A set of cache operations (both invalidation and flush) were redundant
in the S3C HS OTG Samsung driver:

1. s3c_udc_ep0_zlp - to transmit EP0's ZLP packets one don't need to flush
the cache (since it is the zero length transmission)

2. s3c_udc_pre_setup and s3c_ep0_complete_out - cache invalidation is not
needed when the buffer for OUT EP0 transmission is setup, since no data
has yet arrived.

Cache cleanups presented above don't contribute much to transmission speed
up, hence shall be regarded as cosmetic changes.

3. setdma_rx - here the s3c UDC driver's internal buffers were invalidated.
This call is not needed anymore since we reuse the buffers passed from
gadgets. This is a key contribution to transmission speed improvement.

Test condition
- test HW + measurement: Trats - Exynos4210 rev.1
- test HW Trats2 - Exynos4412 rev.1
400 MiB compressed rootfs image download with `thor 0 mmc 0`

Measurements:

Base values (without improvement):
Transmission speed: 9.51 MiB/s

After the change:
Transmission speed: 10.15 MiB/s

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Marek Vasut <marex@denx.de>