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Subject[PATCH 1/2] dmaengine/ste_dma40: add a separate queue for pending requests
Date
tx_submit will add descriptors to the pending queue. Issue pending
will then move the pending descriptors to the transfer queue.

Signed-off-by: Per Forlin <per.forlin@linaro.org>
---
drivers/dma/ste_dma40.c | 26 ++++++++++++++++++++++++--
1 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 8f222d4..91d5ed7 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -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,
--
1.7.4.1


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