diff options
Diffstat (limited to 'src/northbridge/amd/amdmct/mct_ddr3/s3utils.c')
| -rw-r--r-- | src/northbridge/amd/amdmct/mct_ddr3/s3utils.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c index 8ed7e3ce87..0a508cb406 100644 --- a/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c +++ b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c @@ -209,7 +209,7 @@ static uint32_t read_config32_dct_nbpstate(device_t dev, uint8_t node, uint8_t d return pci_read_config32(dev, reg); } -static void copy_cbmem_spd_data_to_save_variable(struct amd_s3_persistent_data* persistent_data) +static void copy_cbmem_spd_data_to_save_variable(struct amd_s3_persistent_data* persistent_data, uint8_t * restored) { uint8_t node; uint8_t dimm; @@ -232,6 +232,13 @@ static void copy_cbmem_spd_data_to_save_variable(struct amd_s3_persistent_data* for (node = 0; node < MAX_NODES_SUPPORTED; node++) for (channel = 0; channel < 2; channel++) persistent_data->node[node].memclk[channel] = mem_info->dct_stat[node].Speed; + + if (restored) { + if (mem_info->mct_stat.GStatus & (1 << GSB_ConfigRestored)) + *restored = 1; + else + *restored = 0; + } } void copy_mct_data_to_save_variable(struct amd_s3_persistent_data* persistent_data) @@ -1030,6 +1037,7 @@ void restore_mct_data_from_save_variable(struct amd_s3_persistent_data* persiste int8_t save_mct_information_to_nvram(void) { uint8_t nvram; + uint8_t restored = 0; if (acpi_is_wakeup_s3()) return 0; @@ -1051,7 +1059,16 @@ int8_t save_mct_information_to_nvram(void) copy_mct_data_to_save_variable(persistent_data); /* Save RAM SPD data at the same time */ - copy_cbmem_spd_data_to_save_variable(persistent_data); + copy_cbmem_spd_data_to_save_variable(persistent_data, &restored); + + if (restored) { + /* Allow training bypass if DIMM configuration is unchanged on next boot */ + nvram = 1; + set_option("allow_spd_nvram_cache_restore", &nvram); + + printk(BIOS_DEBUG, "Hardware configuration unchanged since last boot; skipping write\n"); + return 0; + } /* Obtain CBFS file offset */ s3nv_offset = get_s3nv_file_offset(); |