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From:   Dmitry Osipenko <digetx@gmail.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Mikko Perttunen <cyndis@kapsi.fi>,
        Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Ben Skeggs <bskeggs@redhat.com>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Joerg Roedel <joro@8bytes.org>,
        Nicolas Chauvet <kwizart@gmail.com>
Cc:     devicetree@vger.kernel.org, nouveau@lists.freedesktop.org,
        iommu@lists.linux-foundation.org, dri-devel@lists.freedesktop.org,
        linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH v1 3/6] drm/tegra: Avoid implicit DMA backing with IOMMU
Date:   Fri, 27 Jul 2018 02:16:21 +0300
Message-Id: <20180726231624.21084-4-digetx@gmail.com>
In-Reply-To: <20180726231624.21084-1-digetx@gmail.com>
References: <20180726231624.21084-1-digetx@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/gpu/drm/tegra/dc.c   | 1 +
 drivers/gpu/drm/tegra/gr2d.c | 1 +
 drivers/gpu/drm/tegra/gr3d.c | 1 +
 drivers/gpu/drm/tegra/vic.c  | 1 +
 4 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index eb9bb83f8f5d..4827770939e3 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -2675,6 +2675,7 @@ static const struct dev_pm_ops tegra_dc_pm_ops = {
 struct platform_driver tegra_dc_driver = {
 	.driver = {
 		.name = "tegra-dc",
+		.no_implicit_iommu = true,
 		.of_match_table = tegra_dc_of_match,
 		.pm = &tegra_dc_pm_ops,
 	},
diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c
index 3c5503f1bf3d..e427585ef5cc 100644
--- a/drivers/gpu/drm/tegra/gr2d.c
+++ b/drivers/gpu/drm/tegra/gr2d.c
@@ -327,6 +327,7 @@ static int gr2d_remove(struct platform_device *pdev)
 struct platform_driver tegra_gr2d_driver = {
 	.driver = {
 		.name = "tegra-gr2d",
+		.no_implicit_iommu = true,
 		.of_match_table = gr2d_match,
 	},
 	.probe = gr2d_probe,
diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
index 651e697ccbba..f54710c36afb 100644
--- a/drivers/gpu/drm/tegra/gr3d.c
+++ b/drivers/gpu/drm/tegra/gr3d.c
@@ -481,6 +481,7 @@ static int gr3d_remove(struct platform_device *pdev)
 struct platform_driver tegra_gr3d_driver = {
 	.driver = {
 		.name = "tegra-gr3d",
+		.no_implicit_iommu = true,
 		.of_match_table = tegra_gr3d_match,
 	},
 	.probe = gr3d_probe,
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index 0e6642bb8524..4ecc466ee490 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -402,6 +402,7 @@ static const struct dev_pm_ops vic_pm_ops = {
 struct platform_driver tegra_vic_driver = {
 	.driver = {
 		.name = "tegra-vic",
+		.no_implicit_iommu = true,
 		.of_match_table = vic_match,
 		.pm = &vic_pm_ops
 	},
-- 
2.18.0