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authorYork Sun <yorksun@freescale.com>2014-09-05 13:52:43 +0800
committerYork Sun <yorksun@freescale.com>2014-09-08 10:30:34 -0700
commitef87cab66492fe530bb6ec2e499b030c5ae60286 (patch)
tree5e96a47140a0a142c05e936ffbb66f8ff0c31c8c /drivers/ddr
parent5cb27c5d44ac789f0f0583b57c15dc708ca55c69 (diff)
driver/ddr/fsl: Add support of overriding chip select write leveling
JEDEC spec allows DRAM vendors to use prime DQ for write leveling. This is not an issue unless some DQ pins are not connected. If a platform uses regular DIMMs but with reduced DDR ECC pins, the prime DQ may end up on those floating pins for the second rank. The workaround is to use a known good chip select for this purpose. Signed-off-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'drivers/ddr')
-rw-r--r--drivers/ddr/fsl/ctrl_regs.c3
-rw-r--r--drivers/ddr/fsl/interactive.c2
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/ddr/fsl/ctrl_regs.c b/drivers/ddr/fsl/ctrl_regs.c
index 5e0ee77e46..d9cac2296a 100644
--- a/drivers/ddr/fsl/ctrl_regs.c
+++ b/drivers/ddr/fsl/ctrl_regs.c
@@ -2276,6 +2276,9 @@ compute_fsl_memctl_config_regs(const memctl_options_t *popts,
if (ip_rev > 0x40400)
unq_mrs_en = 1;
+ if (ip_rev > 0x40700)
+ ddr->debug[18] = popts->cswl_override;
+
set_ddr_sdram_cfg_2(ddr, popts, unq_mrs_en);
set_ddr_sdram_mode(ddr, popts, common_dimm,
cas_latency, additive_latency, unq_mrs_en);
diff --git a/drivers/ddr/fsl/interactive.c b/drivers/ddr/fsl/interactive.c
index 7fb418744e..6aa16b23dd 100644
--- a/drivers/ddr/fsl/interactive.c
+++ b/drivers/ddr/fsl/interactive.c
@@ -511,6 +511,7 @@ static void fsl_ddr_options_edit(fsl_ddr_info_t *pinfo,
CTRL_OPTIONS(wrlvl_override),
CTRL_OPTIONS(wrlvl_sample),
CTRL_OPTIONS(wrlvl_start),
+ CTRL_OPTIONS(cswl_override),
CTRL_OPTIONS(rcw_override),
CTRL_OPTIONS(rcw_1),
CTRL_OPTIONS(rcw_2),
@@ -801,6 +802,7 @@ static void print_memctl_options(const memctl_options_t *popts)
CTRL_OPTIONS(wrlvl_override),
CTRL_OPTIONS(wrlvl_sample),
CTRL_OPTIONS(wrlvl_start),
+ CTRL_OPTIONS_HEX(cswl_override),
CTRL_OPTIONS(rcw_override),
CTRL_OPTIONS(rcw_1),
CTRL_OPTIONS(rcw_2),