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>
---
drivers/usb/musb/musbhsdma.c | 39 +++++++++++++++++++++++++++++++++------
1 files changed, 33 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index 6118d5f..a0da178 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
@@ -230,6 +230,8 @@ static void configure_channel(struct dma_channel *channel,
u8 buffer_is_aligned = (dma_addr & 0x3) ? 0 : 1;
u8 use_sdma = (musb_channel->sysdma_channel == -1) ? 0 : 1;
u16 csr = 0;
+ u16 frame = len;
+ int data_type = OMAP_DMA_DATA_TYPE_S8;
DBG(4, "%p, pkt_sz %d, addr 0x%x, len %d, mode %d\n",
channel, packet_sz, dma_addr, len, mode);
@@ -238,13 +240,38 @@ static void configure_channel(struct dma_channel *channel,
(musb->hwvers >= MUSB_HWVERS_1800))
use_sdma = 0;
+ if (use_sdma) {
+ switch (dma_addr & 0x3) {
+ case 0:
+ if ((len % 4) == 0) {
+ data_type = OMAP_DMA_DATA_TYPE_S32;
+ frame = len / 4;
+ break;
+ }
+ /* FALLTHROUGH */
+ case 2:
+ if ((len % 2) == 0) {
+ data_type = OMAP_DMA_DATA_TYPE_S16;
+ frame = len / 2;
+ break;
+ }
+ /* FALLTHROUGH */
+ case 1:
+ case 3:
+ default:
+ data_type = OMAP_DMA_DATA_TYPE_S8;
+ frame = len;
+ break;
+ }
+ }
+
if (use_sdma && !musb_channel->transmit) {
/* System DMA */
/* RX: set src = FIFO */
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 */
@@ -268,9 +295,9 @@ static void configure_channel(struct dma_channel *channel,
/* System DMA */
/* TX: set dst = FIFO */
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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