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Ensure that full DDR5 SPD is read

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Change-Id: I8be865e7a3702245f50fd62479dcc52e67933145
Signed-off-by: Jeremy Soller <jackpot51@gmail.com>
This commit is contained in:
Jeremy Soller
2024-03-21 13:54:14 -06:00
parent 9c1710a9a7
commit 160f0f97a2
3 changed files with 18 additions and 36 deletions
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2
src/include/spd_bin.h
View File

@ -36,7 +36,7 @@
#define DDR4_SPD_PART_LEN 20
#define DDR4_SPD_SN_OFF 325
#define MAX_SPD_PAGE_SIZE_SPD5 128
#define MAX_SPD_SIZE (SPD_PAGE_LEN * SPD_SN_LEN)
#define MAX_SPD_SIZE (SPD_PAGE_LEN * 4)
#define SPD_HUB_MEMREG(addr) ((u8)(0x80 | (addr)))
#define SPD5_MR11 0x0B
#define SPD5_MR0 0x00

4
src/lib/spd_cache.c
View File

@ -209,7 +209,9 @@ enum cb_err spd_fill_from_cache(uint8_t *spd_cache, struct spd_block *blk)
dram_type = *(spd_cache + SC_SPD_OFFSET(i) + SPD_DRAM_TYPE);
if (dram_type == SPD_DRAM_DDR4 || dram_type == SPD_DRAM_DDR5)
if (dram_type == SPD_DRAM_DDR5)
blk->len = CONFIG_DIMM_SPD_SIZE;
else if (dram_type == SPD_DRAM_DDR4)
blk->len = SPD_PAGE_LEN_DDR4;
else
blk->len = SPD_PAGE_LEN;

48
src/soc/intel/common/block/smbus/smbuslib.c
View File

@ -6,17 +6,6 @@
#include <device/smbus_host.h>
#include "smbuslib.h"
static const struct spd_offset_table spd_ddr5_table[] = {
{ 0, 1 }, /* General Configuration section */
{ 2, 2 }, /* General Configuration section */
{ 3, 47 }, /* General Configuration section */
{ 126, 127 }, /* General Configuration section */
{ 192, 213 }, /* Module-Specific section */
{ 230, 235 }, /* Module-Specific section */
{ 512, 520 }, /* Module Supplier's data */
{ 521, 550 }, /* Module Supplier's data */
};
static void update_spd_len(struct spd_block *blk)
{
u8 i, j = 0;
@ -24,8 +13,11 @@ static void update_spd_len(struct spd_block *blk)
if (blk->spd_array[i] != NULL)
j |= blk->spd_array[i][SPD_DRAM_TYPE];
/* If spd used is DDR4/5, then its length is 512 byte. */
if (j == SPD_DRAM_DDR4 || j == SPD_DRAM_DDR5)
/* If spd used is DDR5, then its length is 1024 byte. */
if (j == SPD_DRAM_DDR5)
blk->len = CONFIG_DIMM_SPD_SIZE;
/* If spd used is DDR4, then its length is 512 byte. */
else if (j == SPD_DRAM_DDR4)
blk->len = SPD_PAGE_LEN_DDR4;
else
blk->len = SPD_PAGE_LEN;
@ -64,24 +56,23 @@ static void switch_page(u8 spd_addr, u8 new_page)
* Read the SPD data over the SMBus, at the specified SPD address,
* starting at the specified starting offset and read the given amount of data.
*/
static void smbus_read_spd5(u8 *spd, u8 spd_addr, const u16 start, u8 size, u8 *const page)
static void smbus_read_spd5(u8 *spd, u8 spd_addr, u16 size)
{
u16 index;
u8 page = (u8) (~0);
u32 max_page_size = MAX_SPD_PAGE_SIZE_SPD5;
if ((start + size) >= MAX_SPD_SIZE) {
if (size > MAX_SPD_SIZE) {
printk(BIOS_ERR, "Maximum SPD size reached\n");
return;
}
for (int i = 0; i < size; i++) {
index = start + i;
u8 next_page = index / max_page_size;
if (next_page != *page) {
u8 next_page = (u8) (i / max_page_size);
if (next_page != page) {
switch_page(spd_addr, next_page);
*page = next_page;
page = next_page;
}
unsigned int byte_addr = SPD_HUB_MEMREG(index % max_page_size);
spd[index] = smbus_read_byte(spd_addr, byte_addr);
unsigned int byte_addr = SPD_HUB_MEMREG(i % max_page_size);
spd[i] = smbus_read_byte(spd_addr, byte_addr);
}
}
@ -120,18 +111,7 @@ static int get_spd(u8 *spd, u8 addr)
}
if (is_spd5_hub(addr)) {
const struct spd_offset_table *tbl;
u32 byte;
u32 stop;
u8 page;
page = (u8) (~0);
stop = ARRAY_SIZE(spd_ddr5_table);
for (byte = 0; byte < stop; byte++) {
tbl = &spd_ddr5_table[byte];
smbus_read_spd5(spd, addr, tbl->start,
tbl->end - tbl->start + 1, &page);
}
smbus_read_spd5(spd, addr, CONFIG_DIMM_SPD_SIZE);
/* Reset the page for the next loop iteration */
reset_page_spd5(addr);