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device/dram: Add addtional LPDDR4 speed grades 

Add additonal LPDDR4 speed grades. This is needed because the limited
set has casued confusion when the reported speed did not match
expectations. There does not seem to be a definitive list of LPDDR4
speed grades, so this list is derieved from JEDEC 209-4C and a survey
of commonly used LPDDR4 speed grades.

BUG=b:194184950
TEST=Boot, dmidecode -t 17 reports correct speed
BRANCH=None

Change-Id: Ie7706fd4ad5a7df68c07b8ca43261429ba140c61
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57294
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Nikolai Vyssotski <nikolai.vyssotski@amd.corp-partner.google.com>
This commit is contained in:
Rob Barnes 2021-08-31 15:42:20 -06:00 committed by Felix Held
parent 845488d232
commit 4c66daaadd
1 changed files with 37 additions and 7 deletions
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44
src/device/dram/lpddr4.c
View File

@ -10,10 +10,15 @@
#include <types.h>
enum lpddr4_speed_grade {
LPDDR4_1333,
LPDDR4_1600,
LPDDR4_1866,
LPDDR4_2133,
LPDDR4_2400,
LPDDR4_2666,
LPDDR4_3200,
LPDDR4_4266
LPDDR4_3733,
LPDDR4_4266,
};
struct lpddr4_speed_attr {
@ -23,7 +28,7 @@ struct lpddr4_speed_attr {
};
/**
* LPDDR4 speed attributes derived from JEDEC 209-4C table 210
* LPDDR4 speed attributes derived from JEDEC 209-4C and industry norms
*
* min_clock_mhz = Previous max_clock_mhz + 1
* max_clock_mhz = 1000/min_tCk_avg(ns)
@ -31,24 +36,49 @@ struct lpddr4_speed_attr {
* May be slightly less than the actual max MT/s
*/
static const struct lpddr4_speed_attr lpddr4_speeds[] = {
[LPDDR4_1600] = {
[LPDDR4_1333] = {
.min_clock_mhz = 10,
.max_clock_mhz = 667,
.reported_mts = 1333,
},
[LPDDR4_1600] = {
.min_clock_mhz = 668,
.max_clock_mhz = 800,
.reported_mts = 1600
},
[LPDDR4_2400] = {
[LPDDR4_1866] = {
.min_clock_mhz = 801,
.max_clock_mhz = 934,
.reported_mts = 1866,
},
[LPDDR4_2133] = {
.min_clock_mhz = 935,
.max_clock_mhz = 1067,
.reported_mts = 2133
},
[LPDDR4_2400] = {
.min_clock_mhz = 1068,
.max_clock_mhz = 1200,
.reported_mts = 2400
},
[LPDDR4_3200] = {
[LPDDR4_2666] = {
.min_clock_mhz = 1201,
.max_clock_mhz = 1333,
.reported_mts = 2666
},
[LPDDR4_3200] = {
.min_clock_mhz = 1334,
.max_clock_mhz = 1600,
.reported_mts = 3200
},
[LPDDR4_4266] = {
[LPDDR4_3733] = {
.min_clock_mhz = 1601,
.max_clock_mhz = 2137,
.max_clock_mhz = 1867,
.reported_mts = 3733
},
[LPDDR4_4266] = {
.min_clock_mhz = 1868,
.max_clock_mhz = 2134,
.reported_mts = 4266
},
};