coresight: tmc: Configure DMA mask appropriately

Before making any DMA API calls, the ETR driver should really be setting
its masks to ensure that DMA is possible. Especially since it can
address more than the 32-bit default mask set by the AMBA bus code.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index d8517d2a968caf8f97e1a2e5c89c9167a12bc58d..864488793f091b0a258cf1c10b6c0ce4d6066a95 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -362,6 +362,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
                desc.type = CORESIGHT_DEV_TYPE_SINK;
                desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
                desc.ops = &tmc_etr_cs_ops;
+               /*
+                * ETR configuration uses a 40-bit AXI master in place of
+                * the embedded SRAM of ETB/ETF.
+                */
+               ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
+               if (ret)
+                       goto out;
        } else {
                desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
                desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;