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drivers/smmstore/ramstage.c: retry smmstore init up 5 times

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Retry calling the SMI 5 times in case the initial write to APM did not
cause SMM entry immediately.

Fixes occasional SMMSTORE initialization failure on Clevo NV4xPZ with
Intel i5-1240P processor. The issue was especially evident when all
logging in coreboot was disabled.

Based on SMMSTORE implementation in MrChromebox's fork of EDK2:
27854bc8c5

Change-Id: I8929af25c4f69873bbdd835fde5cb60fc324b6ab
Signed-off-by: Michał Kopeć <michal.kopec@3mdeb.com>
This commit is contained in:
Michał Kopeć
2023-03-16 14:30:06 +01:00
committed by Tim Crawford
parent d9977a9fa9
commit 5f608c9734
1 changed files with 20 additions and 8 deletions
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28
src/drivers/smmstore/ramstage.c
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@@ -8,6 +8,7 @@
#include <smmstore.h>
#include <types.h>
#include <cbmem.h>
#include <delay.h>
static struct smmstore_params_info info;
@@ -39,6 +40,7 @@ static void init_store(void *unused)
struct smmstore_params_init args;
uint32_t eax = ~0;
uint32_t ebx;
uint8_t retry = 5;
if (smmstore_get_info(&info) < 0) {
printk(BIOS_INFO, "SMMSTORE: Failed to get meta data\n");
@@ -57,14 +59,24 @@ static void init_store(void *unused)
printk(BIOS_INFO, "SMMSTORE: Setting up SMI handler\n");
/* Issue SMI using APM to update the com buffer and to lock the SMMSTORE */
__asm__ __volatile__ (
"outb %%al, %%dx"
: "=a" (eax)
: "a" ((SMMSTORE_CMD_INIT << 8) | APM_CNT_SMMSTORE),
"b" (ebx),
"d" (APM_CNT)
: "memory");
/*
* Issue SMI using APM to update the com buffer and to lock the SMMSTORE.
* Retry 5 times in case the SMI isn't triggered immediately.
*/
do {
__asm__ __volatile__ (
"outb %%al, %%dx"
: "=a" (eax)
: "a" ((SMMSTORE_CMD_INIT << 8) | APM_CNT_SMMSTORE),
"b" (ebx),
"d" (APM_CNT)
: "memory");
if (eax == SMMSTORE_RET_SUCCESS)
break;
mdelay(1);
} while (retry--);
if (eax != SMMSTORE_RET_SUCCESS) {
printk(BIOS_ERR, "SMMSTORE: Failed to install com buffer\n");