mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 23:12:32 +00:00
41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
|
From 39f5d9e883393e32938eac45b564f74afde8a942 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Rob Herring <robh@kernel.org>
|
||
|
|
Date: Wed, 4 Sep 2019 11:43:30 +0100
|
||
|
|
Subject: [PATCH] of/address: Translate 'dma-ranges' for parent nodes
|
||
|
|
missing 'dma-ranges'
|
||
|
|
|
||
|
|
commit 81db12ee15cb83926e290a8a3654a2dfebc80935 upstream.
|
||
|
|
|
||
|
|
'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>
|
||
|
|
---
|
||
|
|
drivers/of/address.c | 6 +++++-
|
||
|
|
1 file changed, 5 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
--- a/drivers/of/address.c
|
||
|
|
+++ b/drivers/of/address.c
|
||
|
|
@@ -519,9 +519,13 @@ static int of_translate_one(struct devic
|
||
|
|
*
|
||
|
|
* 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;
|
||
|
|
}
|