[U-Boot] [PATCH v2 2/6] usb:udc:samsung: Remove redundant cache operation from Samsung UDC driver

[Lukasz Majewski]

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 at samsung.com>
Cc: Marek Vasut <marex at denx.de>

---
Changes for v2:
- Remove Change-Id:
- More verbose commit message
- Remove superficial cache invalidation at s3c_ep0_complete_out() function
---
 drivers/usb/gadget/s3c_udc_otg_xfer_dma.c |   17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c b/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
index 1cbf8f6..cbc8734 100644
--- a/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
+++ b/drivers/usb/gadget/s3c_udc_otg_xfer_dma.c
@@ -29,10 +29,6 @@ static inline void s3c_udc_ep0_zlp(struct s3c_udc *dev)
 {
 	u32 ep_ctrl;
 
-	flush_dcache_range((unsigned long) usb_ctrl_dma_addr,
-			   (unsigned long) usb_ctrl_dma_addr
-			   + DMA_BUFFER_SIZE);
-
 	writel(usb_ctrl_dma_addr, &reg->in_endp[EP0_CON].diepdma);
 	writel(DIEPT_SIZ_PKT_CNT(1), &reg->in_endp[EP0_CON].dieptsiz);
 
@@ -52,10 +48,6 @@ void s3c_udc_pre_setup(void)
 	debug_cond(DEBUG_IN_EP,
 		   "%s : Prepare Setup packets.\n", __func__);
 
-	invalidate_dcache_range((unsigned long) usb_ctrl_dma_addr,
-				(unsigned long) usb_ctrl_dma_addr
-				+ DMA_BUFFER_SIZE);
-
 	writel(DOEPT_SIZ_PKT_CNT(1) | sizeof(struct usb_ctrlrequest),
 	       &reg->out_endp[EP0_CON].doeptsiz);
 	writel(usb_ctrl_dma_addr, &reg->out_endp[EP0_CON].doepdma);
@@ -82,10 +74,6 @@ static inline void s3c_ep0_complete_out(void)
 	debug_cond(DEBUG_IN_EP,
 		"%s : Prepare Complete Out packet.\n", __func__);
 
-	invalidate_dcache_range((unsigned long) usb_ctrl_dma_addr,
-				(unsigned long) usb_ctrl_dma_addr
-				+ DMA_BUFFER_SIZE);
-
 	writel(DOEPT_SIZ_PKT_CNT(1) | sizeof(struct usb_ctrlrequest),
 	       &reg->out_endp[EP0_CON].doeptsiz);
 	writel(usb_ctrl_dma_addr, &reg->out_endp[EP0_CON].doepdma);
@@ -115,11 +103,6 @@ static int setdma_rx(struct s3c_ep *ep, struct s3c_request *req)
 	ep->len = length;
 	ep->dma_buf = buf;
 
-	invalidate_dcache_range((unsigned long) ep->dev->dma_buf[ep_num],
-				(unsigned long) ep->dev->dma_buf[ep_num]
-				+ ROUND(ep->ep.maxpacket,
-					CONFIG_SYS_CACHELINE_SIZE));
-
 	if (length == 0)
 		pktcnt = 1;
 	else
-- 
1.7.10.4