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 | 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 -- 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
