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authorRob Herring <robh@kernel.org>2019-09-04 11:43:30 +0100
committerRob Herring <robh@kernel.org>2019-10-08 13:55:26 -0500
commit81db12ee15cb83926e290a8a3654a2dfebc80935 (patch)
tree0376a0382cb3e0af5f370a1e8e123436213c98e5 /drivers/of
parent04db93a95aef392a98f9ffa8745da2e7c58ba75b (diff)
downloadlinux-81db12ee15cb83926e290a8a3654a2dfebc80935.tar.bz2
of/address: Translate 'dma-ranges' for parent nodes missing 'dma-ranges'
'dma-ranges' frequently exists without parent nodes having 'dma-ranges'. While this is an error for 'ranges', this is fine because DMA capable devices always have a translatable DMA address. Also, with no 'dma-ranges' at all, the assumption is that DMA addresses are 1:1 with no restrictions unless perhaps the device itself has implicit restrictions. Cc: Robin Murphy <robin.murphy@arm.com> Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/address.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 887c0413f648..1c291bd6bce2 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -519,9 +519,13 @@ static int of_translate_one(struct device_node *parent, struct of_bus *bus,
*
* As far as we know, this damage only exists on Apple machines, so
* This code is only enabled on powerpc. --gcl
+ *
+ * This quirk also applies for 'dma-ranges' which frequently exist in
+ * child nodes without 'dma-ranges' in the parent nodes. --RobH
*/
ranges = of_get_property(parent, rprop, &rlen);
- if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
+ if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
+ strcmp(rprop, "dma-ranges")) {
pr_debug("no ranges; cannot translate\n");
return 1;
}