From: Kyle Roeschley <kyle.roeschley@ni.com>
Date: Mon, 31 Oct 2016 16:26:17 +0000 (-0500)
Subject: ARM: zynq: Reserve correct amount of non-DMA RAM
X-Git-Tag: v4.10-rc1~85^2^2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7a3cc2a7b2c723aa552028f4e66841cec183756d;p=karo-tx-linux.git

ARM: zynq: Reserve correct amount of non-DMA RAM

On Zynq, we haven't been reserving the correct amount of DMA-incapable
RAM to keep DMA away from it (per the Zynq TRM Section 4.1, it should be
the first 512k). In older kernels, this was masked by the
memblock_reserve call in arm_memblock_init(). Now, reserve the correct
amount excplicitly rather than relying on swapper_pg_dir, which is an
address and not a size anyway.

Fixes: 46f5b96 ("ARM: zynq: Reserve not DMAable space in front of the
kernel")

Signed-off-by: Kyle Roeschley <kyle.roeschley@ni.com>
Tested-by: Nathan Rossi <nathan@nathanrossi.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
index d12002cd63bc..ed118648313f 100644
--- a/arch/arm/mach-zynq/common.c
+++ b/arch/arm/mach-zynq/common.c
@@ -59,7 +59,7 @@ void __iomem *zynq_scu_base;
 static void __init zynq_memory_init(void)
 {
 	if (!__pa(PAGE_OFFSET))
-		memblock_reserve(__pa(PAGE_OFFSET), __pa(swapper_pg_dir));
+		memblock_reserve(__pa(PAGE_OFFSET), 0x80000);
 }
 
 static struct platform_device zynq_cpuidle_device = {