This patch makes the edma driver resume correctly after suspend. Tested
on an AM33xx platform with cyclic audio streams and omap_hsmmc.
All information can be reconstructed by already known runtime
information.
As we now use some functions that were previously only used from __init
context, annotations had to be dropped.
Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
---
There was actually only a v3 ever, I made a mistake when formating the
first version of this patch. To prevent confusion though, I named this
one v4.
v3 -> v4:
* dropped extra allocations, and reconstruct register values
from already known driver states.
Hi Joel, Gururaja, Balaji,
thanks a lot for your feedback. I successfully tested this version with
davinci mcasp as well as omap_hsmmc. I'd appreciate another round of
reviews :)
Thanks,
Daniel
arch/arm/common/edma.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 79 insertions(+), 3 deletions(-)
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 8e1a024..f15cdb9 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -239,6 +239,8 @@ struct edma {
/* list of channels with no even trigger; terminated by "-1" */
const s8 *noevent;
+ struct edma_soc_info *info;
+
/* The edma_inuse bit for each PaRAM slot is clear unless the
* channel is in use ... by ARM or DSP, for QDMA, or whatever.
*/
@@ -290,13 +292,13 @@ static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
~(0x7 << bit), queue_no << bit);
}
-static void __init map_queue_tc(unsigned ctlr, int queue_no, int tc_no)
+static void map_queue_tc(unsigned ctlr, int queue_no, int tc_no)
{
int bit = queue_no * 4;
edma_modify(ctlr, EDMA_QUETCMAP, ~(0x7 << bit), ((tc_no & 0x7) << bit));
}
-static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
+static void assign_priority_to_queue(unsigned ctlr, int queue_no,
int priority)
{
int bit = queue_no * 4;
@@ -315,7 +317,7 @@ static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
* included in that particular EDMA variant (Eg : dm646x)
*
*/
-static void __init map_dmach_param(unsigned ctlr)
+static void map_dmach_param(unsigned ctlr)
{
int i;
for (i = 0; i < EDMA_MAX_DMACH; i++)
@@ -1785,15 +1787,89 @@ static int edma_probe(struct platform_device *pdev)
edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
edma_write_array(j, EDMA_QRAE, i, 0x0);
}
+ edma_cc[j]->info = info[j];
arch_num_cc++;
}
return 0;
}
+static int edma_pm_suspend(struct device *dev)
+{
+ int j;
+
+ pm_runtime_get_sync(dev);
+
+ for (j = 0; j < arch_num_cc; j++) {
+ struct edma *ecc = edma_cc[j];
+
+ disable_irq(ecc->irq_res_start);
+ disable_irq(ecc->irq_res_end);
+ }
+
+ pm_runtime_put_sync(dev);
+
+ return 0;
+}
+
+static int edma_pm_resume(struct device *dev)
+{
+ int i, j;
+
+ pm_runtime_get_sync(dev);
+
+ for (j = 0; j < arch_num_cc; j++) {
+ struct edma *cc = edma_cc[j];
+
+ s8 (*queue_priority_mapping)[2];
+ s8 (*queue_tc_mapping)[2];
+
+ queue_tc_mapping = cc->info->queue_tc_mapping;
+ queue_priority_mapping = cc->info->queue_priority_mapping;
+
+ /* Event queue to TC mapping */
+ for (i = 0; queue_tc_mapping[i][0] != -1; i++)
+ map_queue_tc(j, queue_tc_mapping[i][0],
+ queue_tc_mapping[i][1]);
+
+ /* Event queue priority mapping */
+ for (i = 0; queue_priority_mapping[i][0] != -1; i++)
+ assign_priority_to_queue(j,
+ queue_priority_mapping[i][0],
+ queue_priority_mapping[i][1]);
+
+ /* Map the channel to param entry if channel mapping logic
+ * exist
+ */
+ if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
+ map_dmach_param(j);
+
+ for (i = 0; i < cc->num_channels; i++)
+ if (test_bit(i, cc->edma_inuse)) {
+ /* ensure access through shadow region 0 */
+ edma_or_array2(j, EDMA_DRAE, 0, i >> 5,
+ BIT(i & 0x1f));
+
+ setup_dma_interrupt(i,
+ cc->intr_data[i].callback,
+ cc->intr_data[i].data);
+ }
+
+ enable_irq(cc->irq_res_start);
+ enable_irq(cc->irq_res_end);
+ }
+
+ pm_runtime_put_sync(dev);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(edma_pm_ops, edma_pm_suspend, edma_pm_resume);
+
static struct platform_driver edma_driver = {
.driver = {
.name = "edma",
+ .pm = &edma_pm_ops,
.of_match_table = edma_of_ids,
},
.probe = edma_probe,
--
1.8.3.1
--
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