openwrt_lede/target/linux/ipq806x/patches-4.4/308-soc-qcom-ipq806x-Increase-Atomic-Coherent-Pool-size.patch

From 689a8f1ec58a88152669d21572a1539ad34024cb Mon Sep 17 00:00:00 2001
From: Varadarajan Narayanan <varada@codeaurora.org>
Date: Mon, 30 Mar 2015 13:25:21 +0530
Subject: soc: qcom: ipq806x: Increase Atomic Coherent Pool size

Linux 3.14, by default allocates a 256K Atomic Coherent Pool.
However, Linux 3.4 seems to have allocated ~1.8M for the same.
256K doesn't seem to be enough for the WiFi driver. Hence,
setting the size to be similar to 3.4.

CRs-Fixed: 810357

Change-Id: I5b98a8531dcb33aff451a943f8b83402f9d13fa7
Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org>
---
 arch/arm/mach-qcom/board.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

--- a/arch/arm/mach-qcom/board.c
+++ b/arch/arm/mach-qcom/board.c
@@ -12,6 +12,11 @@
 
 #include <linux/init.h>
 
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+
 #include <asm/mach/arch.h>
 
 static const char * const qcom_dt_match[] __initconst = {
@@ -28,3 +33,19 @@ static const char * const qcom_dt_match[
 DT_MACHINE_START(QCOM_DT, "Qualcomm (Flattened Device Tree)")
 	.dt_compat = qcom_dt_match,
 MACHINE_END
+
+
+static int __init qcom_atomic_pool_size_set(void)
+{
+#define ATOMIC_DMA_COHERENT_POOL_SIZE	SZ_2M
+
+	init_dma_coherent_pool_size(ATOMIC_DMA_COHERENT_POOL_SIZE);
+
+	return 0;
+}
+
+/*
+ * This should happen before atomic_pool_init(), which is a
+ * postcore_initcall.
+ */
+core_initcall(qcom_atomic_pool_size_set);