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| author | Will Deacon <will.deacon@arm.com> | 2011-11-14 17:24:58 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-12-09 08:52:25 -0800 |
| commit | 341f278d7bfbe7233438a8512d183d62ddfae34e (patch) | |
| tree | c22524b513fb146f44760a4d7a28f2903e1fd050 /arch/arm/kernel | |
| parent | 0443648aa178dbf8090edfd6dc54f31f916a174b (diff) | |
| download | kernel_samsung_tuna-341f278d7bfbe7233438a8512d183d62ddfae34e.zip kernel_samsung_tuna-341f278d7bfbe7233438a8512d183d62ddfae34e.tar.gz kernel_samsung_tuna-341f278d7bfbe7233438a8512d183d62ddfae34e.tar.bz2 | |
ARM: 7161/1: errata: no automatic store buffer drain
commit 11ed0ba1754841316d4095478944300acf19acc3 upstream.
This patch implements a workaround for PL310 erratum 769419. On
revisions of the PL310 prior to r3p2, the Store Buffer does not
automatically drain. This can cause normal, non-cacheable writes to be
retained when the memory system is idle, leading to suboptimal I/O
performance for drivers using coherent DMA.
This patch adds an optional wmb() call to the cpu_idle loop. On systems
with an outer cache, this causes an explicit flush of the store buffer.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@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/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/process.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 5e1e541..74ae833 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -191,6 +191,9 @@ void cpu_idle(void) #endif local_irq_disable(); +#ifdef CONFIG_PL310_ERRATA_769419 + wmb(); +#endif if (hlt_counter) { local_irq_enable(); cpu_relax(); |