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41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
From 39f5d9e883393e32938eac45b564f74afde8a942 Mon Sep 17 00:00:00 2001
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From: Rob Herring <robh@kernel.org>
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Date: Wed, 4 Sep 2019 11:43:30 +0100
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Subject: [PATCH] of/address: Translate 'dma-ranges' for parent nodes
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missing 'dma-ranges'
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commit 81db12ee15cb83926e290a8a3654a2dfebc80935 upstream.
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'dma-ranges' frequently exists without parent nodes having 'dma-ranges'.
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While this is an error for 'ranges', this is fine because DMA capable
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devices always have a translatable DMA address. Also, with no
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'dma-ranges' at all, the assumption is that DMA addresses are 1:1 with
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no restrictions unless perhaps the device itself has implicit
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restrictions.
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Cc: Robin Murphy <robin.murphy@arm.com>
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Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Signed-off-by: Rob Herring <robh@kernel.org>
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---
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drivers/of/address.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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--- a/drivers/of/address.c
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+++ b/drivers/of/address.c
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@@ -519,9 +519,13 @@ static int of_translate_one(struct devic
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*
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* As far as we know, this damage only exists on Apple machines, so
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* This code is only enabled on powerpc. --gcl
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+ *
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+ * This quirk also applies for 'dma-ranges' which frequently exist in
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+ * child nodes without 'dma-ranges' in the parent nodes. --RobH
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*/
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ranges = of_get_property(parent, rprop, &rlen);
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- if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
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+ if (ranges == NULL && !of_empty_ranges_quirk(parent) &&
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+ strcmp(rprop, "dma-ranges")) {
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pr_debug("no ranges; cannot translate\n");
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return 1;
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}
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