linux-kernel - [PATCH] dmaengine: pl330: Set DMA_INTERRUPT capability and add related callback

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Date:   Wed, 29 Jun 2022 15:00:03 +0530
From:   Vivek Gautam <vivek.gautam@....com>
To:     dmaengine@...r.kernel.org, vkoul@...nel.org
Cc:     linux-kernel@...r.kernel.org, robin.murphy@....com,
        Vivek Gautam <vivek.gautam@....com>
Subject: [PATCH] dmaengine: pl330: Set DMA_INTERRUPT capability and add related callback

With the verification for DMA_INTERRUPT capability added to the dmatest
module, the dmatest fails to start for various channels of pl330 dma
controller. So, set the DMA_INTERRUPT capability and add the required
callback method to set the transaction descriptor flags.

Signed-off-by: Vivek Gautam <vivek.gautam@....com>
---
 drivers/dma/pl330.c | 24 ++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 858400e42ec0..b80e48f0970b 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2757,6 +2757,28 @@ static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
 	return &desc->txd;
 }
 
+static struct dma_async_tx_descriptor *
+pl330_dma_prep_interrupt(struct dma_chan *chan, unsigned long flags)
+{
+	struct dma_pl330_chan *pch = to_pchan(chan);
+	struct dma_pl330_desc *desc;
+
+	if (unlikely(!pch))
+		return NULL;
+
+	desc = pl330_get_desc(pch);
+	if (!desc) {
+		dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n",
+			__func__, __LINE__);
+		return NULL;
+	}
+
+	/* Set the flags that are passed downstream */
+	desc->txd.flags = flags;
+
+	return &desc->txd;
+}
+
 static struct dma_async_tx_descriptor *
 pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 		dma_addr_t src, size_t len, unsigned long flags)
@@ -3111,6 +3133,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 	}
 
 	dma_cap_set(DMA_MEMCPY, pd->cap_mask);
+	dma_cap_set(DMA_INTERRUPT, pd->cap_mask);
 	if (pcfg->num_peri) {
 		dma_cap_set(DMA_SLAVE, pd->cap_mask);
 		dma_cap_set(DMA_CYCLIC, pd->cap_mask);
@@ -3121,6 +3144,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 	pd->device_free_chan_resources = pl330_free_chan_resources;
 	pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
 	pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic;
+	pd->device_prep_dma_interrupt = pl330_dma_prep_interrupt;
 	pd->device_tx_status = pl330_tx_status;
 	pd->device_prep_slave_sg = pl330_prep_slave_sg;
 	pd->device_config = pl330_config;
-- 
2.17.1