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Commit f82503f5 authored by George Cherian's avatar George Cherian Committed by Felipe Balbi
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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: default avatarGeorge Cherian <george.cherian@ti.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent c57c41d2

drivers/usb/musb/musb_cppi41.c

+13 −0
Original line number Diff line number Diff line
@@ -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;