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Subject[PATCH v2 2/2] !!! FOR TESTING ONLY !!! dmaengine: pl330: add verbose message and set NR_DEFAULT_DESC to 1
Date
Commit add verbose output to pl330 showing what changes introduced by
commit 1/2 from series work as expected. You should see similar output
running modified kernel:

The patch tested on rk3188 radxdarock. Could someone else test it on
other hardware with pl330 DMA?

root@host:~# dmesg | grep pl330
[ 0.277520] dma-pl330 20018000.dma-controller: Loaded driver for PL330 DMAC-241330
[ 0.277538] dma-pl330 20018000.dma-controller: DBUFF-32x8bytes Num_Chans-6 Num_Peri-12 Num_Events-12
[ 0.279894] dma-pl330 20078000.dma-controller: Loaded driver for PL330 DMAC-241330
[ 0.279910] dma-pl330 20078000.dma-controller: DBUFF-64x8bytes Num_Chans-7 Num_Peri-20 Num_Events-14
[ 1.344804] dma-pl330 20078000.dma-controller: pl330_get_desc:2458 Allocated one more descriptor
[ 1.344832] dma-pl330 20078000.dma-controller: pl330_get_desc:2458 Allocated one more descriptor
[ 1.344853] dma-pl330 20078000.dma-controller: pl330_get_desc:2458 Allocated one more descriptor
[ 1.344873] dma-pl330 20078000.dma-controller: pl330_get_desc:2458 Allocated one more descriptor
[ 1.344893] dma-pl330 20078000.dma-controller: pl330_get_desc:2458 Allocated one more descriptor
[ 1.344912] dma-pl330 20078000.dma-controller: pl330_get_desc:2458 Allocated one more descriptor
--- rest of similar lines omitted ---

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
---
drivers/dma/pl330.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index deec4a4..3441c16 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -266,7 +266,7 @@ enum pl330_byteswap {

/* The number of default descriptors */

-#define NR_DEFAULT_DESC 16
+#define NR_DEFAULT_DESC 1

/* Delay for runtime PM autosuspend, ms */
#define PL330_AUTOSUSPEND_DELAY 20
@@ -2455,6 +2455,9 @@ static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)

desc = pluck_desc(&pool, &lock);
WARN_ON(!desc || !list_empty(&pool));
+
+ dev_err(pch->dmac->ddma.dev, "%s:%d Allocated one more descriptor\n",
+ __func__, __LINE__);
}

/* Initialize the descriptor */
--
1.7.9.5
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