From 8bbdb3514b5416b7592bbdf746f8def34309bf77 Mon Sep 17 00:00:00 2001
From: Sahitya Tummala <stummala@codeaurora.org>
Date: Wed, 20 Mar 2013 19:34:59 +0530
Subject: [PATCH] mmc: sdhci-msm: update dma_mask for SDHC device

Set the dma_mask to 0xffffffff to indicate full 32-bit
address space and thus avoiding unnecessary buffers bouncing
from high to low memory.

Change-Id: Idaffe14d4e54a27b15e5a5d82dad41d843714d57
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
---
 drivers/mmc/host/sdhci-msm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index feddbaf8f370..2709904fbcde 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -33,6 +33,7 @@
 #include <linux/slab.h>
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/slot-gpio.h>
+#include <linux/dma-mapping.h>
 #include <mach/gpio.h>
 #include <mach/msm_bus.h>
 
@@ -2035,6 +2036,13 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (dma_supported(mmc_dev(host->mmc), DMA_BIT_MASK(32))) {
+		host->dma_mask = DMA_BIT_MASK(32);
+		mmc_dev(host->mmc)->dma_mask = &host->dma_mask;
+	} else {
+		dev_err(&pdev->dev, "%s: Failed to set dma mask\n", __func__);
+	}
+
 	ret = sdhci_add_host(host);
 	if (ret) {
 		dev_err(&pdev->dev, "Add host failed (%d)\n", ret);