diff options
| author | Dan Elkouby <streetwalkermc@gmail.com> | 2018-04-13 18:45:02 +0300 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-04-16 08:46:23 +0000 |
| commit | 0c024208cdd3cfdfd7689b6fcba1b5c877f550c7 (patch) | |
| tree | b15c57901923e4ae184366fa75a849d4ba2d9f85 /src | |
| parent | 9f79d6091044dc1bf93cf1759b0a44fda1e99965 (diff) | |
device/dram/ddr3: improve XMP support
- Fix offsets for supported CAS latencies
- Add support for reading CWL and CMD rate from the profile
Change-Id: Ie4f545ed1df92c146be02f56fea0ca9037478649
Signed-off-by: Dan Elkouby <streetwalkermc@gmail.com>
Reviewed-on: https://review.coreboot.org/25663
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src')
| -rw-r--r-- | src/device/dram/ddr3.c | 17 | ||||
| -rw-r--r-- | src/include/device/dram/ddr3.h | 2 |
2 files changed, 18 insertions, 1 deletions
diff --git a/src/device/dram/ddr3.c b/src/device/dram/ddr3.c index 67f30092ea..535b48a707 100644 --- a/src/device/dram/ddr3.c +++ b/src/device/dram/ddr3.c @@ -295,6 +295,11 @@ int spd_decode_ddr3(dimm_attr * dimm, spd_raw_data spd) dimm->tRTP = spd[27] * mtb; /* Minimum Four Activate Window Delay Time (tFAWmin) */ dimm->tFAW = (((spd[28] & 0x0f) << 8) + spd[29]) * mtb; + /* Minimum CAS Write Latency Time (tCWLmin) + * - not present in standard SPD */ + dimm->tCWL = 0; + /* System CMD Rate Mode - not present in standard SPD */ + dimm->tCMD = 0; printram(" FTB timings :"); /* FTB is introduced in SPD revision 1.1 */ @@ -484,7 +489,7 @@ int spd_xmp_decode_ddr3(dimm_attr *dimm, /* SDRAM Minimum Cycle Time (tCKmin) */ dimm->tCK = xmp[1] * mtb; /* CAS Latencies Supported */ - dimm->cas_supported = (xmp[9] << 8) + xmp[8]; + dimm->cas_supported = ((xmp[4] << 8) + xmp[3]) & 0x7fff; /* Minimum CAS Latency Time (tAAmin) */ dimm->tAA = xmp[2] * mtb; /* Minimum Write Recovery Time (tWRmin) */ @@ -507,6 +512,10 @@ int spd_xmp_decode_ddr3(dimm_attr *dimm, dimm->tRTP = xmp[16] * mtb; /* Minimum Four Activate Window Delay Time (tFAWmin) */ dimm->tFAW = (((xmp[18] & 0x0f) << 8) + xmp[19]) * mtb; + /* Minimum CAS Write Latency Time (tCWLmin) */ + dimm->tCWL = xmp[5] * mtb; + /* System CMD Rate Mode */ + dimm->tCMD = xmp[23] * mtb; return ret; } @@ -568,6 +577,12 @@ void dram_print_spd_ddr3(const dimm_attr * dimm) print_ns(" tWTRmin : ", dimm->tWTR); print_ns(" tRTPmin : ", dimm->tRTP); print_ns(" tFAWmin : ", dimm->tFAW); + /* Those values are only relevant if an XMP profile sets them */ + if (dimm->tCWL) + print_ns(" tCWLmin : ", dimm->tCWL); + if (dimm->tCMD) + printk(BIOS_INFO, " tCMDmin : %3u\n", + DIV_ROUND_UP(dimm->tCMD, 256)); } /*============================================================================== diff --git a/src/include/device/dram/ddr3.h b/src/include/device/dram/ddr3.h index 0756095588..9a246617d9 100644 --- a/src/include/device/dram/ddr3.h +++ b/src/include/device/dram/ddr3.h @@ -162,6 +162,8 @@ typedef struct dimm_attr_st { u32 tWTR; u32 tRTP; u32 tFAW; + u32 tCWL; + u16 tCMD; u8 reference_card; /* XMP: Module voltage in mV */ |