soc/intel/apollolake: Update default LPDDR4 CA ODT config
Update default ODT config to have correct CA ODT settings as the current defaults are incorrect for all the current apollolake designs. All the current designs pull both A and B channels' LPDDR4 modules' ODT pins to 1.1V. Therefore, the correct impedance setting needs to be applied. In order for the settings to take effect one needs to clear the memory training cache in deployed systems. Trigger this by bumping the memory setting version for the SoC. If needed in the future support for allowing the override of this setting from the mainboard should be straight forward. It's just not necessary at this time. BUG=b:37687843 TEST=BAT test, warm, reboot, S3 cycle test Change-Id: I9a2f7636b46492a9d08472a0752cdf1f86a72e15 Signed-off-by: Ravi Sarawadi <ravishankar.sarawadi@intel.com> Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/19397 Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins)
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@ -30,6 +30,7 @@ config CPU_SPECIFIC_OPTIONS
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select CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM if RELOCATABLE_RAMSTAGE
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select COLLECT_TIMESTAMPS
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select COMMON_FADT
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select FSP_PLATFORM_MEMORY_SETTINGS_VERSIONS
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select GENERIC_GPIO_LIB
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select HAVE_INTEL_FIRMWARE
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select HAVE_SMI_HANDLER
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@ -69,6 +69,20 @@ enum {
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LP4_16Gb_DENSITY,
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};
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/*
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* ODT settings :
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* If ODT PIN to LP4 DRAM is pulled HIGH for ODT_A, and HIGH for ODT_B,
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* choose ODT_AB_HIGH_HIGH. If ODT PIN to LP4 DRAM is pulled HIGH for ODT_A,
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* and LOW for ODT_B, choose ODT_AB_HIGH_LOW.
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*
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* Note that the enum values correspond to the interpreted UPD fields
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* witihn Ch[3:0]_OdtConfig parameters.
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*/
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enum {
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ODT_A_B_HIGH_LOW = 0 << 1,
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ODT_A_B_HIGH_HIGH = 1 << 1,
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};
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/* Provide bit swizzling per DQS and byte swapping within a channel. */
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struct lpddr4_chan_swizzle_cfg {
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uint8_t dqs[LP4_NUM_BYTE_LANES][DQ_BITS_PER_DQS];
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@ -73,11 +73,12 @@ static void set_lpddr4_defaults(FSP_M_CONFIG *cfg)
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cfg->Ch2_Option = 0x3;
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cfg->Ch3_Option = 0x3;
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/* Weak on-die termination. */
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cfg->Ch0_OdtConfig = 0;
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cfg->Ch1_OdtConfig = 0;
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cfg->Ch2_OdtConfig = 0;
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cfg->Ch3_OdtConfig = 0;
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/* Set CA ODT with default setting of ODT pins of LPDDR4 modules pulled
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up to 1.1V. */
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cfg->Ch0_OdtConfig = ODT_A_B_HIGH_HIGH;
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cfg->Ch1_OdtConfig = ODT_A_B_HIGH_HIGH;
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cfg->Ch2_OdtConfig = ODT_A_B_HIGH_HIGH;
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cfg->Ch3_OdtConfig = ODT_A_B_HIGH_HIGH;
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}
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void meminit_lpddr4(FSP_M_CONFIG *cfg, int speed)
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@ -319,3 +320,9 @@ void save_lpddr4_dimm_info(const struct lpddr4_cfg *lp4cfg, size_t mem_sku)
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mem_info->dimm_cnt = index;
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printk(BIOS_DEBUG, "%d DIMMs found\n", mem_info->dimm_cnt);
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}
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uint8_t fsp_memory_soc_version(void)
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{
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/* Bump this value when the memory configuration parameters change. */
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return 1;
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}
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