[PATCH v4 10/21] dmaengine: imx-sdma: error out on unsupported transfer types

[Sascha Hauer]

The i.MX SDMA driver currently silently ignores unsupported transfer
types. These transfer types are specified in the dma channel description
in the device tree, so they should really be checked.
Issue a message and error out when we hit unsupported transfer types.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
Acked-By: Vinod Koul <vkoul at kernel.org>
---

Notes:
    Changes since v2:
    - Use prefix dmaengine:

 drivers/dma/imx-sdma.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 80261a905eb5b..0e70843567cef 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -940,7 +940,7 @@ static irqreturn_t sdma_int_handler(int irq, void *dev_id)
 /*
  * sets the pc of SDMA script according to the peripheral type
  */
-static void sdma_get_pc(struct sdma_channel *sdmac,
+static int sdma_get_pc(struct sdma_channel *sdmac,
 		enum sdma_peripheral_type peripheral_type)
 {
 	struct sdma_engine *sdma = sdmac->sdma;
@@ -1039,13 +1039,17 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
 		emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr;
 		break;
 	default:
-		break;
+		dev_err(sdma->dev, "Unsupported transfer type %d\n",
+			peripheral_type);
+		return -EINVAL;
 	}
 
 	sdmac->pc_from_device = per_2_emi;
 	sdmac->pc_to_device = emi_2_per;
 	sdmac->device_to_device = per_2_per;
 	sdmac->pc_to_pc = emi_2_emi;
+
+	return 0;
 }
 
 static int sdma_load_context(struct sdma_channel *sdmac)
@@ -1213,6 +1217,7 @@ static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac)
 static int sdma_config_channel(struct dma_chan *chan)
 {
 	struct sdma_channel *sdmac = to_sdma_chan(chan);
+	int ret;
 
 	sdma_disable_channel(chan);
 
@@ -1233,7 +1238,9 @@ static int sdma_config_channel(struct dma_chan *chan)
 		break;
 	}
 
-	sdma_get_pc(sdmac, sdmac->peripheral_type);
+	ret = sdma_get_pc(sdmac, sdmac->peripheral_type);
+	if (ret)
+		return ret;
 
 	if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) &&
 			(sdmac->peripheral_type != IMX_DMATYPE_DSP)) {
@@ -1349,7 +1356,9 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
 		mem_data.dma_request2 = 0;
 		data = &mem_data;
 
-		sdma_get_pc(sdmac, IMX_DMATYPE_MEMORY);
+		ret = sdma_get_pc(sdmac, IMX_DMATYPE_MEMORY);
+		if (ret)
+			return ret;
 	}
 
 	switch (data->priority) {
-- 
2.30.2