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Subject[PATCH 3/3] dma: edma: Increase maximum SG limit to 20
Date
davinci-pcm uses 16 as the no.of periods. With this, in EDMA we have to
allocate atleast 17 slots: 1 slot for channel, and 16 slots the periods.

Due to this, the MAX_NR_SG limitation causes problems, set it to 20 to make
cyclic DMA work when davinci-pcm is converted to use DMA Engine. Also add
a comment clarifying this.

Signed-off-by: Joel Fernandes <joelf@ti.com>
---
drivers/dma/edma.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 9b63e1e..407b496 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -46,8 +46,14 @@
#define EDMA_CHANS 64
#endif /* CONFIG_ARCH_DAVINCI_DA8XX */

-/* Max of 16 segments per channel to conserve PaRAM slots */
-#define MAX_NR_SG 16
+/*
+ * Max of 20 segments per channel to conserve PaRAM slots
+ * Also note that MAX_NR_SG should be atleast the no.of periods
+ * that are required for ASoC, otherwise DMA prep calls will
+ * fail. Today davinci-pcm is the only user of this driver and
+ * requires atleast 17 slots, so we setup the default to 20.
+ */
+#define MAX_NR_SG 20
#define EDMA_MAX_SLOTS MAX_NR_SG
#define EDMA_DESCRIPTORS 16

--
1.8.1.2


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