linux-kernel - [RFC PATCH v1 4/6] gpu: host1x: Avoid implicit DMA backing with IOMMU

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Message-Id: <20180726231624.21084-5-digetx@gmail.com>
Date:   Fri, 27 Jul 2018 02:16:22 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        Nicolas Chauvet <kwizart@...il.com>
Cc:     devicetree@...r.kernel.org, nouveau@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org, dri-devel@...ts.freedesktop.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 4/6] gpu: host1x: Avoid implicit DMA backing with IOMMU

Host1x driver manages IOMMU by itself, backing DMA with IOMMU by the
drivers core breaks the Host1x driver.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpu/host1x/dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index afabd33a48d9..0966415d4ccd 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -361,6 +361,7 @@ static int host1x_remove(struct platform_device *pdev)
 static struct platform_driver tegra_host1x_driver = {
 	.driver = {
 		.name = "tegra-host1x",
+		.no_implicit_iommu = true,
 		.of_match_table = host1x_of_match,
 	},
 	.probe = host1x_probe,
-- 
2.18.0