linux-kernel - [PATCH 3.11 015/233] ARM: shmobile: mackerel: Fix coherent DMA mask

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Message-Id: <1391773652-25214-16-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  7 Feb 2014 11:43:54 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Simon Horman <horms+renesas@...ge.net.au>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 015/233] ARM: shmobile: mackerel: Fix coherent DMA mask

3.11.10.4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

commit b6328a6b7ba57fc84c38248f6f0e387e1170f1a8 upstream.

Commit 4dcfa60071b3d23f0181f27d8519f12e37cefbb9 ("ARM: DMA-API: better
handing of DMA masks for coherent allocations") added an additional
check to the coherent DMA mask that results in an error when the mask is
larger than what dma_addr_t can address.

Set the LCDC coherent DMA mask to DMA_BIT_MASK(32) instead of ~0 to fix
the problem.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/arm/mach-shmobile/board-mackerel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-shmobile/board-mackerel.c b/arch/arm/mach-shmobile/board-mackerel.c
index 85f51a8..07ef12a 100644
--- a/arch/arm/mach-shmobile/board-mackerel.c
+++ b/arch/arm/mach-shmobile/board-mackerel.c
@@ -421,7 +421,7 @@ static struct platform_device lcdc_device = {
 	.resource	= lcdc_resources,
 	.dev	= {
 		.platform_data	= &lcdc_info,
-		.coherent_dma_mask = ~0,
+		.coherent_dma_mask = DMA_BIT_MASK(32),
 	},
 };
 
@@ -497,7 +497,7 @@ static struct platform_device hdmi_lcdc_device = {
 	.id		= 1,
 	.dev	= {
 		.platform_data	= &hdmi_lcdc_info,
-		.coherent_dma_mask = ~0,
+		.coherent_dma_mask = DMA_BIT_MASK(32),
 	},
 };
 
-- 
1.8.3.2

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