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Commit a8f3067b authored by Per Forlin's avatar Per Forlin Committed by Vinod Koul
Browse files

dmaengine/ste_dma40: add a separate queue for pending requests 



tx_submit will add descriptors to the pending queue. Issue pending
will then move the pending descriptors to the transfer queue.

Signed-off-by: default avatarPer Forlin <per.forlin@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 70f18915

drivers/dma/ste_dma40.c

+24 −2
Original line number Diff line number Diff line
@@ -199,6 +199,7 @@ struct d40_chan { 
	struct dma_chan			 chan;

	struct tasklet_struct		 tasklet;

	struct list_head		 client;

	struct list_head		 pending_queue;

	struct list_head		 active;

	struct list_head		 queue;

	struct stedma40_chan_cfg	 dma_cfg;
@@ -644,7 +645,20 @@ static struct d40_desc *d40_first_active_get(struct d40_chan *d40c) 


static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc)

{

	list_add_tail(&desc->node, &d40c->queue);

	list_add_tail(&desc->node, &d40c->pending_queue);

}



static struct d40_desc *d40_first_pending(struct d40_chan *d40c)

{

	struct d40_desc *d;



	if (list_empty(&d40c->pending_queue))

		return NULL;



	d = list_first_entry(&d40c->pending_queue,

			     struct d40_desc,

			     node);

	return d;

}



static struct d40_desc *d40_first_queued(struct d40_chan *d40c)
@@ -801,6 +815,11 @@ static void d40_term_all(struct d40_chan *d40c) 
		d40_desc_free(d40c, d40d);

	}



	/* Release pending descriptors */

	while ((d40d = d40_first_pending(d40c))) {

		d40_desc_remove(d40d);

		d40_desc_free(d40c, d40d);

	}



	d40c->pending_tx = 0;

	d40c->busy = false;
@@ -2151,7 +2170,9 @@ static void d40_issue_pending(struct dma_chan *chan) 


	spin_lock_irqsave(&d40c->lock, flags);



	/* Busy means that pending jobs are already being processed */

	list_splice_tail_init(&d40c->pending_queue, &d40c->queue);



	/* Busy means that queued jobs are already being processed */

	if (!d40c->busy)

		(void) d40_queue_start(d40c);
@@ -2340,6 +2361,7 @@ static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma, 


		INIT_LIST_HEAD(&d40c->active);

		INIT_LIST_HEAD(&d40c->queue);

		INIT_LIST_HEAD(&d40c->pending_queue);

		INIT_LIST_HEAD(&d40c->client);



		tasklet_init(&d40c->tasklet, dma_tasklet,