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From: Rob Herring <robh@kernel.org>
To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
	Robin Murphy <robin.murphy@arm.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Stefan Wahren <wahrenst@gmx.net>,
	Frank Rowand <frowand.list@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Marek Vasut <marek.vasut@gmail.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Simon Horman <horms+renesas@verge.net.au>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Oza Pawandeep <oza.oza@broadcom.com>
Subject: [PATCH 10/11] of/address: Translate 'dma-ranges' for parent nodes missing 'dma-ranges'
Date: Thu, 26 Sep 2019 19:24:54 -0500	[thread overview]
Message-ID: <20190927002455.13169-11-robh@kernel.org> (raw)
In-Reply-To: <20190927002455.13169-1-robh@kernel.org>

'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>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/of/address.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index e918001c7798..5b835d332709 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;
 	}
-- 
2.20.1


  parent reply	other threads:[~2019-09-27  0:25 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-27  0:24 [PATCH 00/11] of: dma-ranges fixes and improvements Rob Herring
2019-09-27  0:24 ` [PATCH 01/11] of: Remove unused of_find_matching_node_by_address() Rob Herring
2019-09-27  9:17   ` Geert Uytterhoeven
2019-09-30 12:49   ` Christoph Hellwig
2019-09-27  0:24 ` [PATCH 02/11] of: Make of_dma_get_range() private Rob Herring
2019-09-27  9:18   ` Geert Uytterhoeven
2019-09-30 12:53   ` Christoph Hellwig
2019-09-27  0:24 ` [PATCH 03/11] of: address: Report of_dma_get_range() errors meaningfully Rob Herring
2019-09-27  9:15   ` Geert Uytterhoeven
2019-09-30 12:54   ` Christoph Hellwig
2019-09-27  0:24 ` [PATCH 04/11] of/unittest: Add dma-ranges address translation tests Rob Herring
2019-09-27  0:24 ` [PATCH 05/11] of: Ratify of_dma_configure() interface Rob Herring
2019-09-30 12:57   ` Christoph Hellwig
2019-09-30 13:32     ` Nicolas Saenz Julienne
2019-09-30 21:24       ` Rob Herring
2019-10-01 15:43         ` Nicolas Saenz Julienne
2019-10-04  1:53           ` Rob Herring
2019-10-07 17:51             ` Nicolas Saenz Julienne
2019-09-27  0:24 ` [PATCH 06/11] of/address: Introduce of_get_next_dma_parent() helper Rob Herring
2019-09-27  9:24   ` Geert Uytterhoeven
2019-09-27  0:24 ` [PATCH 07/11] of: address: Follow DMA parent for "dma-coherent" Rob Herring
2019-09-27  0:24 ` [PATCH 08/11] of: Factor out #{addr,size}-cells parsing Rob Herring
2019-09-27  9:27   ` Geert Uytterhoeven
2019-09-27  0:24 ` [PATCH 09/11] of: Make of_dma_get_range() work on bus nodes Rob Herring
2019-09-27  0:24 ` Rob Herring [this message]
2019-09-27  0:24 ` [PATCH 11/11] of/address: Fix of_pci_range_parser_one translation of DMA addresses Rob Herring
2019-09-29 11:16 ` [PATCH 00/11] of: dma-ranges fixes and improvements Arnd Bergmann
2019-09-30  8:20   ` Christoph Hellwig
2019-09-30  8:56     ` Thierry Reding
2019-09-30  9:55       ` Robin Murphy
2019-09-30 13:35         ` Thierry Reding
2019-09-30  9:20 ` Nicolas Saenz Julienne
2019-09-30 12:40 ` Marek Vasut
2019-09-30 12:52   ` Robin Murphy
2019-09-30 12:54     ` Marek Vasut
2019-09-30 13:05       ` Robin Murphy

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