ipq806x: increase coherent dma pool size

Cherry-picked and rebased from
https://source.codeaurora.org/quic/qsdk/system/openwrt/tree/?h=korg/linux-3.4.y/release/arugula_bb_cs



Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>

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);