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authorZang Roy-R61911 <tie-fei.zang@freescale.com>2013-11-28 13:23:37 +0800
committerYork Sun <yorksun@freescale.com>2013-12-04 14:54:42 -0800
commite88f421e7a65e5bd0c6131e5202d710e73dd4aae (patch)
tree29daad933328ec9d6d20b8861399ec8f68319e45 /arch/powerpc/cpu
parent7aa6c455c357f6d767acec747bbecb23664eeacb (diff)
T4240: Address T4240/T4160 Rev2.0 DDR clock change
MEM_PLL_RAT on T4240/T4160 Rev2.0 uses a value which is half of Rev1.0. It's 12 in Rev1.0, for Rev2.0 it uses 6. Signed-off-by: Roy Zang <tie-fei.zang@freescale.com> Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com> Acked-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'arch/powerpc/cpu')
-rw-r--r--arch/powerpc/cpu/mpc85xx/speed.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/speed.c b/arch/powerpc/cpu/mpc85xx/speed.c
index 1a58a194f9..46ae80c4d8 100644
--- a/arch/powerpc/cpu/mpc85xx/speed.c
+++ b/arch/powerpc/cpu/mpc85xx/speed.c
@@ -86,6 +86,14 @@ void get_sys_info(sys_info_t *sys_info)
mem_pll_rat = (in_be32(&gur->rcwsr[0]) >>
FSL_CORENET_RCWSR0_MEM_PLL_RAT_SHIFT)
& FSL_CORENET_RCWSR0_MEM_PLL_RAT_MASK;
+ /* T4240/T4160 Rev2.0 MEM_PLL_RAT uses a value which is half of
+ * T4240/T4160 Rev1.0. eg. It's 12 in Rev1.0, however, for Rev2.0
+ * it uses 6.
+ */
+#if defined(CONFIG_PPC_T4240) || defined(CONFIG_PPC_T4160)
+ if (SVR_MAJ(get_svr()) >= 2)
+ mem_pll_rat *= 2;
+#endif
if (mem_pll_rat > 2)
sys_info->freq_ddrbus *= mem_pll_rat;
else