Use optimal values of transfer element based on buffer address in system
DMA programming. This would improve the performance.
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@xxxxxx>
---
Patch created against linus'tree + all musb patches in Greg's queue
Changes from v1:
- fixed extra identation in switch statement.
drivers/usb/musb/musbhsdma.c | 29 ++++++++++++++++++++++++++---
1 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index d29e487..22a2978 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
@@ -52,11 +52,34 @@ static void musb_sdma_channel_program(struct musb *musb,
struct musb_dma_channel *musb_channel,
dma_addr_t dma_addr, u32 len)
{
+ u16 frame = len;
+ int data_type = OMAP_DMA_DATA_TYPE_S8;
+
+ switch (dma_addr & 0x3) {
+ case 0:
+ if ((len % 4) == 0) {
+ data_type = OMAP_DMA_DATA_TYPE_S32;
+ frame = len / 4;
+ break;
+ }
+ case 2:
+ if ((len % 2) == 0) {
+ data_type = OMAP_DMA_DATA_TYPE_S16;
+ frame = len / 2;
+ break;
+ }
+ case 1:
+ case 3:
+ default:
+ data_type = OMAP_DMA_DATA_TYPE_S8;
+ frame = len;
+ break;
+ }
/* set transfer parameters */
omap_set_dma_transfer_params(musb_channel->sysdma_channel,
- OMAP_DMA_DATA_TYPE_S8,
- len ? len : 1, 1, /* One frame */
- OMAP_DMA_SYNC_ELEMENT,
+ data_type,
+ len ? frame : 1, 1, /* One frame */
+ OMAP_DMA_SYNC_FRAME,
OMAP24XX_DMA_NO_DEVICE,
0); /* Src Sync */
--
1.6.2.4
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