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dmaengine: pl330: Add support for mcbufsz parsed from DT

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This patch introduce property 'arm,pl330-mcbufsz-bytes' to
support assign mcbufsz from DT.

And we limit the max value to one PAGE_SIZE. though there
is no limit for the controller.

e.g.

  arm,pl330-mcbufsz-bytes = <2048>;

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: Ia13c35e58cd6addcc7a80cb05b484184f6031989
This commit is contained in:
Sugar Zhang
2023-07-13 10:51:39 +08:00
committed by Tao Huang
parent 7a07ac5cd2
commit c4afd40f7f
1 changed files with 7 additions and 1 deletions
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8
drivers/dma/pl330.c
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@@ -3191,6 +3191,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
struct resource *res;
int i, ret, irq;
int num_chan;
int val;
struct device_node *np = adev->dev.of_node;
ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32));
@@ -3205,7 +3206,12 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
pd = &pl330->ddma;
pd->dev = &adev->dev;
pl330->mcbufsz = 0;
if (!device_property_read_u32(&adev->dev, "arm,pl330-mcbufsz-bytes", &val)) {
if ((val > 0) && (val <= PAGE_SIZE))
pl330->mcbufsz = val;
dev_info(&adev->dev, "mcbufsz: %d bytes\n", pl330->mcbufsz);
}
/* get quirk */
for (i = 0; i < ARRAY_SIZE(of_quirks); i++)