linux-kernel - [RFC PATCH v1 3/6] drm/tegra: Avoid implicit DMA backing with IOMMU

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Message-Id: <20180726231624.21084-4-digetx@gmail.com>
Date:   Fri, 27 Jul 2018 02:16:21 +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 3/6] drm/tegra: Avoid implicit DMA backing with IOMMU

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

Signed-off-by: Dmitry Osipenko <digetx@...il.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