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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>
This commit is contained in:
Dan Elkouby 2018-04-13 18:45:02 +03:00 committed by Patrick Georgi
parent 9f79d60910
commit 0c024208cd
2 changed files with 18 additions and 1 deletions
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17
src/device/dram/ddr3.c
View File

@ -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));
}
/*==============================================================================

2
src/include/device/dram/ddr3.h
View File

@ -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 */