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bus: fsl-mc: set dma_mask for the DPRC devices

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On Layerscape platforms when SMMU is disabled by ATF, the root DPRC probes
with its dma_mask pointer unset which leads to a notification:
  "DMA mask not set"
so the device is left with a zero DMA mask instead of a sane default.

Let's seed the masks for all cases.

It was tested on LX2160A with no SMMU on the MC domain: the warning is gone
and the DPAA2 children probe unchanged.

Signed-off-by: Vincent Jardin <vjardin@free.fr>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20260731-for-upstream-fsl-mc-dprc-dma-mask-v2-1-ea7058b90f06@free.fr
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
This commit is contained in:
Vincent Jardin 2026-07-31 22:13:49 +02:00 committed by Christophe Leroy (CS GROUP)
parent bada60f2d9
commit f85e5ec18e
1 changed files with 4 additions and 3 deletions
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7
drivers/bus/fsl-mc/fsl-mc-bus.c
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@ -797,6 +797,10 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
}
dev_set_name(&mc_dev->dev, "%s.%d", obj_desc->type, obj_desc->id);
mc_dev->dma_mask = FSL_MC_DEFAULT_DMA_MASK;
mc_dev->dev.dma_mask = &mc_dev->dma_mask;
mc_dev->dev.coherent_dma_mask = mc_dev->dma_mask;
if (strcmp(obj_desc->type, "dprc") == 0) {
struct fsl_mc_io *mc_io2;
@ -838,9 +842,6 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
* parent's ICID.
*/
mc_dev->icid = parent_mc_dev->icid;
mc_dev->dma_mask = FSL_MC_DEFAULT_DMA_MASK;
mc_dev->dev.dma_mask = &mc_dev->dma_mask;
mc_dev->dev.coherent_dma_mask = mc_dev->dma_mask;
}
/*