From: Changhwan Youn <[email protected]> This patch is applied according to the commit 1a8e41cd672f894bbd74874eac601e6cedf838fb (ARM: 6395/1: VExpress: Set bit 22 in the PL310 (cache controller) AuxCtlr register).
Actually, S5PV310 has same cache controller(PL310). Following is from Catalin Marinas' commit. 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. Signed-off-by: Changhwan Youn <[email protected]> Cc: <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Russell King <[email protected]> Signed-off-by: Kukjin Kim <[email protected]> --- arch/arm/mach-s5pv310/cpu.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/arm/mach-s5pv310/cpu.c b/arch/arm/mach-s5pv310/cpu.c index 82ce4aa..b2a37d0 100644 --- a/arch/arm/mach-s5pv310/cpu.c +++ b/arch/arm/mach-s5pv310/cpu.c @@ -168,7 +168,7 @@ static int __init s5pv310_l2x0_cache_init(void) __raw_writel(L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN, S5P_VA_L2CC + L2X0_POWER_CTRL); - l2x0_init(S5P_VA_L2CC, 0x7C070001, 0xC200ffff); + l2x0_init(S5P_VA_L2CC, 0x7C470001, 0xC200ffff); return 0; } -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
