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authorYork Sun <yorksun@freescale.com>2014-11-14 17:17:50 -0800
committerYork Sun <yorksun@freescale.com>2014-12-05 08:06:14 -0800
commit789b3447c0c02fd0eec839f694446c0dd4eb3718 (patch)
tree6618b4d31c56c1d899852b45eac2e84a69fb5dd6 /drivers/ddr
parent2892ec5f435ccda8b5f4c6690aa3c3ceecd7834e (diff)
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driver/ddr/fsl: Add workaround for faulty SPD
Some UDIMMs have faulty SPD with wrong mapping for DQ[36-39]. Using raw card spec in case this error is detected. Signed-off-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'drivers/ddr')
-rw-r--r--drivers/ddr/fsl/ddr4_dimm_params.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/ddr/fsl/ddr4_dimm_params.c b/drivers/ddr/fsl/ddr4_dimm_params.c
index 2418dca..aaddc8f 100644
--- a/drivers/ddr/fsl/ddr4_dimm_params.c
+++ b/drivers/ddr/fsl/ddr4_dimm_params.c
@@ -126,6 +126,12 @@ ddr_compute_dimm_parameters(const generic_spd_eeprom_t *spd,
{
unsigned int retval;
int i;
+ const u8 udimm_rc_e_dq[18] = {
+ 0x0c, 0x2c, 0x15, 0x35, 0x15, 0x35, 0x0b, 0x2c, 0x15,
+ 0x35, 0x0b, 0x35, 0x0b, 0x2c, 0x0b, 0x35, 0x15, 0x36
+ };
+ int spd_error = 0;
+ u8 *ptr;
if (spd->mem_type) {
if (spd->mem_type != SPD_MEMTYPE_DDR4) {
@@ -179,6 +185,22 @@ ddr_compute_dimm_parameters(const generic_spd_eeprom_t *spd,
/* Unbuffered DIMMs */
if (spd->mod_section.unbuffered.addr_mapping & 0x1)
pdimm->mirrored_dimm = 1;
+ if ((spd->mod_section.unbuffered.mod_height & 0xe0) == 0 &&
+ (spd->mod_section.unbuffered.ref_raw_card == 0x04)) {
+ /* Fix SPD error found on DIMMs with raw card E0 */
+ for (i = 0; i < 18; i++) {
+ if (spd->mapping[i] == udimm_rc_e_dq[i])
+ continue;
+ spd_error = 1;
+ debug("SPD byte %d: 0x%x, should be 0x%x\n",
+ 60 + i, spd->mapping[i],
+ udimm_rc_e_dq[i]);
+ ptr = (u8 *)&spd->mapping[i];
+ *ptr = udimm_rc_e_dq[i];
+ }
+ if (spd_error)
+ puts("SPD DQ mapping error fixed\n");
+ }
break;
default: