diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2010-09-16 17:57:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-28 21:51:13 -0700 |
| commit | c1e962e493031fce0a7f15ded4fb16e94d35ac90 (patch) | |
| tree | 382159eab9ea0d5e974ed6122f7ce0813dda7cb7 /arch | |
| parent | 134da12cdde543d62dfcb3a39f6487edee674339 (diff) | |
ARM: 6395/1: VExpress: Set bit 22 in the PL310 (cache controller) AuxCtlr register
commit 1a8e41cd672f894bbd74874eac601e6cedf838fb upstream.
Clearing bit 22 in the PL310 Auxiliary Control register (shared
attribute override enable) has the side effect of transforming Normal
Shared Non-cacheable reads into Cacheable no-allocate reads.
Coherent DMA buffers in Linux always have a Cacheable alias via the
kernel linear mapping and the processor can speculatively load cache
lines into the PL310 controller. With bit 22 cleared, Non-cacheable
reads would unexpectedly hit such cache lines leading to buffer
corruption.
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-vexpress/ct-ca9x4.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mach-vexpress/ct-ca9x4.c b/arch/arm/mach-vexpress/ct-ca9x4.c index 6353459bb56..d6dd6f62ba7 100644 --- a/arch/arm/mach-vexpress/ct-ca9x4.c +++ b/arch/arm/mach-vexpress/ct-ca9x4.c @@ -225,7 +225,7 @@ static void ct_ca9x4_init(void) int i; #ifdef CONFIG_CACHE_L2X0 - l2x0_init(MMIO_P2V(CT_CA9X4_L2CC), 0x00000000, 0xfe0fffff); + l2x0_init(MMIO_P2V(CT_CA9X4_L2CC), 0x00400000, 0xfe0fffff); #endif clkdev_add_table(lookups, ARRAY_SIZE(lookups)); |