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soc/intel/common: Restore to page 0 before reading SPD 

test: Warm reboot from Windows 11 w/ Samsung 980 Pro on Banshee
Verify memory type detected properly and following boot works

Change-Id: Iad0a2024bd0ef39f6ab57ff7a6e6aa651d7882a6
Signed-off-by: CoolStar <coolstarorganization@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76382
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
This commit is contained in:
CoolStar 2023-07-07 15:59:04 -07:00 committed by Kyösti Mälkki
parent 3e52d7955f
commit 0cb5eace6c
1 changed files with 10 additions and 0 deletions
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10
src/soc/intel/common/block/smbus/smbuslib.c
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@ -40,6 +40,11 @@ static void smbus_read_spd(u8 *spd, u8 addr)
/* return -1 if SMBus errors otherwise return 0 */
static int get_spd(u8 *spd, u8 addr)
{
if (CONFIG_DIMM_SPD_SIZE > SPD_PAGE_LEN) {
/* Restore to page 0 before reading */
smbus_write_byte(SPD_PAGE_0, 0, 0);
}
/* If address is not 0, it will return CB_ERR(-1) if no dimm */
if (smbus_read_byte(addr, 0) < 0) {
printk(BIOS_INFO, "No memory dimm at address %02X\n",
@ -102,6 +107,11 @@ enum cb_err get_spd_sn(u8 addr, u32 *sn)
if (addr == 0x0)
return CB_ERR;
if (CONFIG_DIMM_SPD_SIZE > SPD_PAGE_LEN) {
/* Restore to page 0 before reading */
smbus_write_byte(SPD_PAGE_0, 0, 0);
}
/* If dimm is not present, set sn to 0xff. */
smbus_ret = smbus_read_byte(addr, SPD_DRAM_TYPE);
if (smbus_ret < 0) {