ARM: edma: Add function to manually trigger an EDMA channel

Manual trigger for events missed as a result of splitting a
scatter gather list and DMA'ing it in batches. Add a helper
function to trigger a channel incase any such events are missed.

Signed-off-by: Joel Fernandes <joelf@ti.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 39ad030ac0c7..117f955a2a06 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -1235,6 +1235,23 @@ void edma_resume(unsigned channel)
 }
 EXPORT_SYMBOL(edma_resume);
 
+int edma_trigger_channel(unsigned channel)
+{
+        unsigned ctlr;
+        unsigned int mask;
+
+        ctlr = EDMA_CTLR(channel);
+        channel = EDMA_CHAN_SLOT(channel);
+        mask = BIT(channel & 0x1f);
+
+        edma_shadow0_write_array(ctlr, SH_ESR, (channel >> 5), mask);
+
+        pr_debug("EDMA: ESR%d %08x\n", (channel >> 5),
+                 edma_shadow0_read_array(ctlr, SH_ESR, (channel >> 5)));
+        return 0;
+}
+EXPORT_SYMBOL(edma_trigger_channel);
+
 /**
  * edma_start - start dma on a channel
  * @channel: channel being activated