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nb/intel/sandybridge/raminit: Honor SPD's dll_off_mode 

In DDR3 DLL-Off mode is an optional feature advertised by SPD.
Honor the SPD and only use DLL-Off mode when all DIMMs on the
same channel indicate support for it.
The same is done on MRC.bin.

Tested on Lenovo X220: Still boots fine.

Change-Id: Ief4bfb9e045cad7ff9953f6fda248586ea951a52
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79758
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Patrick Rudolph 2023-12-21 07:08:49 +01:00 committed by Felix Held
parent 41a5954a67
commit 68642ca981
1 changed files with 14 additions and 8 deletions
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22
src/northbridge/intel/sandybridge/raminit_common.c
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@ -667,26 +667,32 @@ static void write_mrreg(ramctr_timing *ctrl, int channel, int slotrank, int reg,
}
/* Obtain optimal power down mode for current configuration */
static enum power_down_mode get_power_down_mode(ramctr_timing *ctrl)
static enum power_down_mode get_power_down_mode(ramctr_timing *ctrl, int channel)
{
int slotrank;
if (ctrl->tXP > 8)
return PDM_NONE;
if (ctrl->tXPDLL > 32)
return PDM_PPD;
FOR_ALL_POPULATED_RANKS
if (!ctrl->info.dimm[channel][slotrank >> 1].flags.dll_off_mode)
return PDM_APD_PPD;
if (CONFIG(RAMINIT_ALWAYS_ALLOW_DLL_OFF) || get_platform_type() == PLATFORM_MOBILE)
return PDM_DLL_OFF;
return PDM_APD_PPD;
}
static u32 make_mr0(ramctr_timing *ctrl, u8 rank)
static u32 make_mr0(ramctr_timing *ctrl, int channel, u8 rank)
{
u16 mr0reg, mch_cas, mch_wr;
static const u8 mch_wr_t[12] = { 1, 2, 3, 4, 0, 5, 0, 6, 0, 7, 0, 0 };
const enum power_down_mode power_down = get_power_down_mode(ctrl);
const enum power_down_mode power_down = get_power_down_mode(ctrl, channel);
const bool slow_exit = power_down == PDM_DLL_OFF || power_down == PDM_APD_DLL_OFF;
@ -715,7 +721,7 @@ static u32 make_mr0(ramctr_timing *ctrl, u8 rank)
static void dram_mr0(ramctr_timing *ctrl, u8 rank, int channel)
{
write_mrreg(ctrl, channel, rank, 0, make_mr0(ctrl, rank));
write_mrreg(ctrl, channel, rank, 0, make_mr0(ctrl, channel, rank));
}
static odtmap get_ODT(ramctr_timing *ctrl, int channel)
@ -2818,13 +2824,13 @@ void final_registers(ramctr_timing *ctrl)
};
tc_othp.tCPDED = 1;
mchbar_write32(TC_OTHP_ch(channel), tc_othp.raw);
}
/* 64 DCLKs until idle, decision per rank */
mchbar_write32(PM_PDWN_CONFIG, get_power_down_mode(ctrl) << 8 | 64);
/* 64 DCLKs until idle, decision per rank */
r32 = get_power_down_mode(ctrl, channel) << 8 | 64;
mchbar_write32(PM_PDWN_CONFIG_ch(channel), r32);
FOR_ALL_CHANNELS
mchbar_write32(PM_TRML_M_CONFIG_ch(channel), 0x00000aaa);
}
mchbar_write32(PM_BW_LIMIT_CONFIG, 0x5f7003ff);
mchbar_write32(PM_DLL_CONFIG, 0x00073000 | ctrl->mdll_wake_delay);