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authorDan Elkouby <streetwalkermc@gmail.com>2018-04-13 18:45:02 +0300
committerPatrick Georgi <pgeorgi@google.com>2018-04-16 08:46:23 +0000
commit0c024208cdd3cfdfd7689b6fcba1b5c877f550c7 (patch)
treeb15c57901923e4ae184366fa75a849d4ba2d9f85 /src/device/dram
parent9f79d6091044dc1bf93cf1759b0a44fda1e99965 (diff)
downloadcoreboot-0c024208cdd3cfdfd7689b6fcba1b5c877f550c7.tar.xz
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/device/dram')
-rw-r--r--src/device/dram/ddr3.c17
1 files changed, 16 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));
}
/*==============================================================================