linux-kernel - [PATCH 2/2] drm/tegra: Set the DMA mask

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1456208754-12362-2-git-send-email-acourbot@nvidia.com>
Date:	Tue, 23 Feb 2016 15:25:54 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>,
	Terje Bergström <tbergstrom@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>
CC:	dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, gnurou@...il.com,
	Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH 2/2] drm/tegra: Set the DMA mask

The default DMA mask covers a 32 bits address range, but tegradrm can
address more than that. Set the DMA mask to the actual addressable range
to avoid the use of unneeded bounce buffers.

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
Thierry, I am not absolutely sure whether the size is correct and applies
to all Tegra generations - please let me know if this needs to be
reworked.

 drivers/gpu/drm/tegra/drm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index bc0555adecaf..503fc9e73521 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -992,6 +992,7 @@ static int host1x_drm_probe(struct host1x_device *dev)
 
 	dev_set_drvdata(&dev->dev, drm);
 	of_dma_configure(drm->dev, NULL);
+	dma_set_mask(drm->dev, DMA_BIT_MASK(34));
 
 	err = drm_dev_register(drm, 0);
 	if (err < 0)
-- 
2.7.1