diff options
| author | Timothy Pearson <tpearson@raptorengineeringinc.com> | 2015-11-24 14:11:50 -0600 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-01-24 23:24:33 +0100 |
| commit | a2df081d44bcaef25a26b6c33117811387c818ae (patch) | |
| tree | c810bc1dacb1ed907e501ab4904bf2950366ef6e /src | |
| parent | ba2af2e21d309538c50c207bc818e895c0a8a2a1 (diff) | |
northbridge/amd/amdmct/mct_ddr3: Enable fast refresh on ETR devices
When an Extended Temperature Range DIMM is installed on a channel
the refresh rate should be increased per the BKDG recommendations
to allow correct operation at higher temperature ranges.
Set fast refresh on a channel if an ETR DIMM is installed on that
channel.
Change-Id: I7a085d34efc78f3f0794a5cb33b88f27a5e6d54e
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/13144
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/northbridge/amd/amdmct/mct_ddr3/mct_d.c | 12 | ||||
| -rw-r--r-- | src/northbridge/amd/amdmct/mct_ddr3/mct_d.h | 5 |
2 files changed, 14 insertions, 3 deletions
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c index ac5220e404..beb71f9b70 100644 --- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c +++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c @@ -3993,6 +3993,7 @@ static void SPD2ndTiming(struct MCTStatStruc *pMCTstat, u32 DramTimingLo, DramTimingHi; u8 tCK16x; u16 Twtr; + uint8_t Etr[2]; u8 LDIMM; u8 MTB16x; u8 byte; @@ -4011,6 +4012,8 @@ static void SPD2ndTiming(struct MCTStatStruc *pMCTstat, Trc = 0; Twr = 0; Twtr = 0; + for (i=0; i < 2; i++) + Etr[i] = 0; for (i=0; i < 4; i++) Trfc[i] = 0; Tfaw = 0; @@ -4077,6 +4080,10 @@ static void SPD2ndTiming(struct MCTStatStruc *pMCTstat, val *= MTB16x; if (Tfaw < val) Tfaw = val; + + /* Determine if the DIMMs on this channel support 95°C ETR */ + if (pDCTstat->spd_data.spd_bytes[dct + i][SPD_Thermal] & 0x1) + Etr[dct] = 1; } /* Dimm Present */ } @@ -4248,7 +4255,10 @@ static void SPD2ndTiming(struct MCTStatStruc *pMCTstat, dev = pDCTstat->dev_dct; dword = Get_NB32_DCT(dev, dct, 0x8c); /* DRAM Timing High */ - val = 2; /* Tref = 7.8us */ + if (Etr[dct]) + val = 3; /* Tref = 3.9us */ + else + val = 2; /* Tref = 7.8us */ dword &= ~(0x3 << 16); dword |= (val & 0x3) << 16; Set_NB32_DCT(dev, dct, 0x8c, dword); /* DRAM Timing High */ diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h index 5f72ff383f..e7361ac587 100644 --- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h +++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h @@ -217,8 +217,8 @@ #define SPD_CASHigh 15 #define SPD_tAAmin 16 -#define SPD_DEVATTRIB 22 -#define SPD_EDCTYPE 11 +#define SPD_DEVATTRIB 22 +#define SPD_EDCTYPE 11 #define JED_ADRCPAR 0x04 #define SPD_tWRmin 17 @@ -232,6 +232,7 @@ #define SPD_tRTPmin 27 #define SPD_Upper_tFAW 28 #define SPD_tFAWmin 29 +#define SPD_Thermal 31 #define SPD_RefRawCard 62 #define SPD_AddressMirror 63 |