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 <[email protected]> --- 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..39c1801 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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
