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

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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>
This commit is contained in:
George Cherian 2014-01-27 15:07:25 +05:30 committed by Felipe Balbi
parent c57c41d2c6
commit f82503f549
1 changed files with 13 additions and 0 deletions
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13
drivers/usb/musb/musb_cppi41.c
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@ -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;