From 7e4db27ffd11f3eea7e4dfc33354fd087f9257d8 Mon Sep 17 00:00:00 2001 From: York Sun Date: Fri, 17 Aug 2012 08:22:41 +0000 Subject: [PATCH] powerpc/mpc8xxx DDR: Fix CAS latency calculation Empty slot should be skipped when calculating CAS latency. Signed-off-by: York Sun Signed-off-by: Andy Fleming --- arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c b/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c index a474a654c2..03a784cd47 100644 --- a/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c +++ b/arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c @@ -27,8 +27,10 @@ compute_cas_latency_ddr3(const dimm_params_t *dimm_params, /* compute the common CAS latency supported between slots */ tmp = dimm_params[0].caslat_X; - for (i = 1; i < number_of_dimms; i++) - tmp &= dimm_params[i].caslat_X; + for (i = 1; i < number_of_dimms; i++) { + if (dimm_params[i].n_ranks) + tmp &= dimm_params[i].caslat_X; + } common_caslat = tmp; /* compute the max tAAmin tCKmin between slots */ -- 2.39.5