From 13f7988067856845ef593795003160db5ccf43cd Mon Sep 17 00:00:00 2001 From: Mingkai Hu Date: Wed, 7 Sep 2016 17:56:08 +0800 Subject: [PATCH] armv8: fsl-layerscape: Increase L2 Data RAM latency and L2 Tag RAM latency According to design specification, the L2 cache operates at the same frequency as the A72 CPUs in the cluster with a 3-cycle latency, so increase the L2 Data RAM and Tag RAM latency to 3 cycles, or else, will run into different call trace issues. Signed-off-by: Mingkai Hu Signed-off-by: Gong Qianyu Reviewed-by: York Sun --- arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S index 5af6b73bc9..6451a36e54 100644 --- a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S +++ b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S @@ -179,6 +179,21 @@ ENTRY(lowlevel_init) isb dsb sy #endif + +#ifdef CONFIG_LS1046A + /* Initialize the L2 RAM latency */ + mrs x1, S3_1_c11_c0_2 + mov x0, #0x1C7 + /* Clear L2 Tag RAM latency and L2 Data RAM latency */ + bic x1, x1, x0 + /* Set L2 data ram latency bits [2:0] */ + orr x1, x1, #0x2 + /* set L2 tag ram latency bits [8:6] */ + orr x1, x1, #0x80 + msr S3_1_c11_c0_2, x1 + isb +#endif + mov lr, x29 /* Restore LR */ ret ENDPROC(lowlevel_init) -- 2.39.5