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soc/intel/apollolake: clarify meaning of LPDDR4 density meaning 

The 'dram density' is a misnomer because the memory initialization
code treats that input parameter as a per rank density. Therefore,
update the variables to further clarify how it's actually being
used.

BUG=chrome-os-partner:55446

Change-Id: Ie4c944f35b531812205ac0bb1c70f39ac401495e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15773
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Aaron Durbin 2016-07-21 10:20:58 -05:00
parent dd8ed42ed6
commit 48f662d941
3 changed files with 33 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/mainboard/google/reef/romstage.c
View File

@ -78,16 +78,16 @@ static const struct lpddr4_sku skus[] = {
*/
[0] = {
.speed = LP4_SPEED_2400,
.ch0_density = LP4_8Gb_DENSITY,
.ch1_density = LP4_8Gb_DENSITY,
.ch0_rank_density = LP4_8Gb_DENSITY,
.ch1_rank_density = LP4_8Gb_DENSITY,
.ch0_dual_rank = 1,
.ch1_dual_rank = 1,
},
/* K4F8E304HB-MGCJ - both logical channels */
[1] = {
.speed = LP4_SPEED_2400,
.ch0_density = LP4_8Gb_DENSITY,
.ch1_density = LP4_8Gb_DENSITY,
.ch0_rank_density = LP4_8Gb_DENSITY,
.ch1_rank_density = LP4_8Gb_DENSITY,
},
/*
* MT53B512M32D2NP-062WT:C - both logical channels. While the parts
@ -96,22 +96,22 @@ static const struct lpddr4_sku skus[] = {
*/
[2] = {
.speed = LP4_SPEED_2400,
.ch0_density = LP4_8Gb_DENSITY,
.ch1_density = LP4_8Gb_DENSITY,
.ch0_rank_density = LP4_8Gb_DENSITY,
.ch1_rank_density = LP4_8Gb_DENSITY,
.ch0_dual_rank = 1,
.ch1_dual_rank = 1,
},
/* MT53B256M32D1NP-062 WT:C - both logical channels */
[3] = {
.speed = LP4_SPEED_2400,
.ch0_density = LP4_8Gb_DENSITY,
.ch1_density = LP4_8Gb_DENSITY,
.ch0_rank_density = LP4_8Gb_DENSITY,
.ch1_rank_density = LP4_8Gb_DENSITY,
},
/* K4F8E304HB-MGCH - both logical channels */
[PROTO_SKU] = {
.speed = LP4_SPEED_2400,
.ch0_density = LP4_8Gb_DENSITY,
.ch1_density = LP4_8Gb_DENSITY,
.ch0_rank_density = LP4_8Gb_DENSITY,
.ch1_rank_density = LP4_8Gb_DENSITY,
},
};

6
src/soc/intel/apollolake/include/soc/meminit.h
View File

@ -92,13 +92,13 @@ void meminit_lpddr4(struct FSP_M_CONFIG *cfg, int speed);
* to the memory reference code.
*/
void meminit_lpddr4_enable_channel(struct FSP_M_CONFIG *cfg, int logical_chan,
int device_density, int dual_rank,
int rank_density, int dual_rank,
const struct lpddr4_swizzle_cfg *scfg);
struct lpddr4_sku {
int speed;
int ch0_density;
int ch1_density;
int ch0_rank_density;
int ch1_rank_density;
int ch0_dual_rank;
int ch1_dual_rank;
};

39
src/soc/intel/apollolake/meminit.c
View File

@ -105,7 +105,7 @@ void meminit_lpddr4(struct FSP_M_CONFIG *cfg, int speed)
}
static void enable_logical_chan0(struct FSP_M_CONFIG *cfg,
int device_density, int dual_rank,
int rank_density, int dual_rank,
const struct lpddr4_swizzle_cfg *scfg)
{
const struct lpddr4_chan_swizzle_cfg *chan;
@ -118,8 +118,8 @@ static void enable_logical_chan0(struct FSP_M_CONFIG *cfg,
* Physical channel 0 is comprised of the CH0_DQB signals.
* Physical channel 1 is comprised of the CH0_DQA signals.
*/
cfg->Ch0_DramDensity = device_density;
cfg->Ch1_DramDensity = device_density;
cfg->Ch0_DramDensity = rank_density;
cfg->Ch1_DramDensity = rank_density;
/* Enable ranks on both channels depending on dual rank option. */
rank_mask = dual_rank ? 0x3 : 0x1;
cfg->Ch0_RankEnable = rank_mask;
@ -150,7 +150,7 @@ static void enable_logical_chan0(struct FSP_M_CONFIG *cfg,
}
static void enable_logical_chan1(struct FSP_M_CONFIG *cfg,
int device_density, int dual_rank,
int rank_density, int dual_rank,
const struct lpddr4_swizzle_cfg *scfg)
{
const struct lpddr4_chan_swizzle_cfg *chan;
@ -163,8 +163,8 @@ static void enable_logical_chan1(struct FSP_M_CONFIG *cfg,
* Physical channel 2 is comprised of the CH1_DQB signals.
* Physical channel 3 is comprised of the CH1_DQA signals.
*/
cfg->Ch2_DramDensity = device_density;
cfg->Ch3_DramDensity = device_density;
cfg->Ch2_DramDensity = rank_density;
cfg->Ch3_DramDensity = rank_density;
/* Enable ranks on both channels depending on dual rank option. */
rank_mask = dual_rank ? 0x3 : 0x1;
cfg->Ch2_RankEnable = rank_mask;
@ -195,22 +195,21 @@ static void enable_logical_chan1(struct FSP_M_CONFIG *cfg,
}
void meminit_lpddr4_enable_channel(struct FSP_M_CONFIG *cfg, int logical_chan,
int device_density, int dual_rank,
int rank_density, int dual_rank,
const struct lpddr4_swizzle_cfg *scfg)
{
if (device_density < LP4_8Gb_DENSITY ||
device_density > LP4_16Gb_DENSITY) {
printk(BIOS_ERR, "Invalid LPDDR4 density: %d\n",
device_density);
if (rank_density < LP4_8Gb_DENSITY ||
rank_density > LP4_16Gb_DENSITY) {
printk(BIOS_ERR, "Invalid LPDDR4 density: %d\n", rank_density);
return;
}
switch (logical_chan) {
case LP4_LCH0:
enable_logical_chan0(cfg, device_density, dual_rank, scfg);
enable_logical_chan0(cfg, rank_density, dual_rank, scfg);
break;
case LP4_LCH1:
enable_logical_chan1(cfg, device_density, dual_rank, scfg);
enable_logical_chan1(cfg, rank_density, dual_rank, scfg);
break;
default:
printk(BIOS_ERR, "Invalid logical channel: %d\n", logical_chan);
@ -235,18 +234,20 @@ void meminit_lpddr4_by_sku(struct FSP_M_CONFIG *cfg,
meminit_lpddr4(cfg, sku->speed);
if (sku->ch0_density) {
if (sku->ch0_rank_density) {
printk(BIOS_INFO, "LPDDR4 Ch0 density = %d\n",
sku->ch0_density);
meminit_lpddr4_enable_channel(cfg, LP4_LCH0, sku->ch0_density,
sku->ch0_rank_density);
meminit_lpddr4_enable_channel(cfg, LP4_LCH0,
sku->ch0_rank_density,
sku->ch0_dual_rank,
lpcfg->swizzle_config);
}
if (sku->ch1_density) {
if (sku->ch1_rank_density) {
printk(BIOS_INFO, "LPDDR4 Ch1 density = %d\n",
sku->ch1_density);
meminit_lpddr4_enable_channel(cfg, LP4_LCH1, sku->ch1_density,
sku->ch1_rank_density);
meminit_lpddr4_enable_channel(cfg, LP4_LCH1,
sku->ch1_rank_density,
sku->ch1_dual_rank,
lpcfg->swizzle_config);
}