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Commit e8e017d7 authored by Sujeev Dias's avatar Sujeev Dias Committed by Gerrit - the friendly Code Review server
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mhi: dev: uci: chain large transfers together 



If we're transferring a large (> mtu) packet, then chain the
descriptors together to reduce number of completion events.

CRs-Fixed: 2254571
Change-Id: I015b9b998461566541ddc1e660ccc4fc5991f84e
Signed-off-by: default avatarSujeev Dias <sdias@codeaurora.org>
parent c14114cf

drivers/bus/mhi/devices/mhi_uci.c

+10 −4
Original line number Diff line number Diff line
@@ -251,7 +251,7 @@ static ssize_t mhi_uci_write(struct file *file, 
	struct mhi_device *mhi_dev = uci_dev->mhi_dev;

	struct uci_chan *uci_chan = &uci_dev->ul_chan;

	size_t bytes_xfered = 0;

	int ret;

	int ret, nr_avail;



	if (!buf || !count)

		return -EINVAL;
@@ -275,8 +275,8 @@ static ssize_t mhi_uci_write(struct file *file, 
		/* wait for free descriptors */

		ret = wait_event_interruptible(uci_chan->wq,

			(!uci_dev->enabled) ||

			mhi_get_no_free_descriptors

					       (mhi_dev, DMA_TO_DEVICE) > 0);

			(nr_avail = mhi_get_no_free_descriptors(mhi_dev,

							DMA_TO_DEVICE)) > 0);



		if (ret == -ERESTARTSYS) {

			MSG_LOG("Exit signal caught for node\n");
@@ -297,7 +297,13 @@ static ssize_t mhi_uci_write(struct file *file, 
		}



		spin_lock_bh(&uci_chan->lock);

		flags = (count - xfer_size) ? MHI_EOB : MHI_EOT;



		/* if ring is full after this force EOT */

		if (nr_avail > 1 && (count - xfer_size))

			flags = MHI_CHAIN;

		else

			flags = MHI_EOT;



		if (uci_dev->enabled)

			ret = mhi_queue_transfer(mhi_dev, DMA_TO_DEVICE, kbuf,

						 xfer_size, flags);