usb: musb: musb_cppi41: Make CPPI aware of high bandwidth transfers

Enable CPPI to handle high bandwidth transfers, especially to support
webcam captures. Use a single bd to get the whole of the data in case of
high bandwidth transfers.

Signed-off-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index f889296..39ee516 100644 (file)
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -448,12 +448,25 @@ static int cppi41_dma_channel_program(struct dma_channel *channel,
                                dma_addr_t dma_addr, u32 len)
 {
        int ret;
+       struct cppi41_dma_channel *cppi41_channel = channel->private_data;
+       int hb_mult = 0;
 
        BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN ||
                channel->status == MUSB_DMA_STATUS_BUSY);
 
+       if (is_host_active(cppi41_channel->controller->musb)) {
+               if (cppi41_channel->is_tx)
+                       hb_mult = cppi41_channel->hw_ep->out_qh->hb_mult;
+               else
+                       hb_mult = cppi41_channel->hw_ep->in_qh->hb_mult;
+       }
+
        channel->status = MUSB_DMA_STATUS_BUSY;
        channel->actual_len = 0;
+
+       if (hb_mult)
+               packet_sz = hb_mult * (packet_sz & 0x7FF);
+
        ret = cppi41_configure_channel(channel, packet_sz, mode, dma_addr, len);
        if (!ret)
                channel->status = MUSB_DMA_STATUS_FREE;