This is a note to let you know that I've just added the patch titled
ARM: tegra: only run PL310 init on systems with one
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-tegra-only-run-pl310-init-on-systems-with-one.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8859685785bfafadf9bc922dd3a2278e59886947 Mon Sep 17 00:00:00 2001
From: Stephen Warren <swarren@xxxxxxxxxx>
Date: Tue, 18 Feb 2014 16:51:58 -0700
Subject: ARM: tegra: only run PL310 init on systems with one
From: Stephen Warren <swarren@xxxxxxxxxx>
commit 8859685785bfafadf9bc922dd3a2278e59886947 upstream.
Fix tegra_init_cache() to check whether the system has a PL310 cache
before touching the PL310 registers. This prevents access to non-existent
registers on Tegra114 and later.
Note for stable kernels:
In <= v3.12, the file to patch is arch/arm/mach-tegra/common.c.
Signed-off-by: Stephen Warren <swarren@xxxxxxxxxx>
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-tegra/common.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -22,6 +22,7 @@
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/delay.h>
+#include <linux/of.h>
#include <linux/irqchip.h>
#include <linux/clk/tegra.h>
@@ -80,10 +81,20 @@ void tegra_assert_system_reset(char mode
static void __init tegra_init_cache(void)
{
#ifdef CONFIG_CACHE_L2X0
+ static const struct of_device_id pl310_ids[] __initconst = {
+ { .compatible = "arm,pl310-cache", },
+ {}
+ };
+
+ struct device_node *np;
int ret;
void __iomem *p = IO_ADDRESS(TEGRA_ARM_PERIF_BASE) + 0x3000;
u32 aux_ctrl, cache_type;
+ np = of_find_matching_node(NULL, pl310_ids);
+ if (!np)
+ return;
+
cache_type = readl(p + L2X0_CACHE_TYPE);
aux_ctrl = (cache_type & 0x700) << (17-8);
aux_ctrl |= 0x7C400001;
Patches currently in stable-queue which might be from swarren@xxxxxxxxxx are
queue-3.10/arm-tegra-only-run-pl310-init-on-systems-with-one.patch
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