linux-kernel - [PATCH 2/5] soc: qcom: smem: Use write-combine remap for SMEM

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Message-Id: <1459226126-16725-2-git-send-email-bjorn.andersson@linaro.org>
Date:	Mon, 28 Mar 2016 21:35:23 -0700
From:	Bjorn Andersson <bjorn.andersson@...aro.org>
To:	Andy Gross <andy.gross@...aro.org>
Cc:	linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] soc: qcom: smem: Use write-combine remap for SMEM

Mapping the SMEM region as write combine makes the contiguous writes
in SMD perform better and also allows us to do unaligned read and writes
on ARM64.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/soc/qcom/smem.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 19019aa092e8..2e1aa9f130f4 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -684,8 +684,7 @@ static int qcom_smem_map_memory(struct qcom_smem *smem, struct device *dev,
 
 	smem->regions[i].aux_base = (u32)r.start;
 	smem->regions[i].size = resource_size(&r);
-	smem->regions[i].virt_base = devm_ioremap_nocache(dev, r.start,
-							  resource_size(&r));
+	smem->regions[i].virt_base = devm_ioremap_wc(dev, r.start, resource_size(&r));
 	if (!smem->regions[i].virt_base)
 		return -ENOMEM;
 
-- 
2.5.0