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fusee: restore DRAM to 204MHz before starting main cpu on Mariko (closes #1600).

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Nintendo's Mariko tables result in trained frequency of 1599999 instead of 1600000.

PCV checks for rate == 1600000 exactly, when doing EMC init.

Thus EMC init does not succeed if we are trained to 1600000.

PCV has a fudge factor of 1000 used in SetEmcDvfsFreq, but this is not used in InitEmcDvfs.

This failure means that PCV cannot change rate back to 204MHz before sleep, and then after
wake extremely degraded performance is observed.

Restoring DRAM to 204MHz before boot causes EMC init to succeed/fixes performance degradation.
This commit is contained in:
Michael Scire
2021-08-30 07:19:28 -07:00
parent 1f065e3bac
commit c5edb031fa
31 changed files with 10747 additions and 15632 deletions
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41
fusee/fusee-primary/fusee-primary-main/src/stage2.c
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@@ -55,42 +55,6 @@ static int stage2_ini_handler(void *user, const char *section, const char *name,
return 1;
}
static bool run_mtc(const char *mtc_path, uintptr_t mtc_address) {
FILINFO info;
size_t size;
/* Check if the MTC binary is present. */
if (f_stat(mtc_path, &info) != FR_OK) {
print(SCREEN_LOG_LEVEL_WARNING, "Stage2's MTC binary not found!\n");
return false;
}
size = (size_t)info.fsize;
/* Try to read the MTC binary. */
if (read_from_file((void *)mtc_address, size, mtc_path) != size) {
print(SCREEN_LOG_LEVEL_WARNING, "Failed to read stage2's MTC binary (%s)!\n", mtc_path);
return false;
}
ScreenLogLevel mtc_log_level = log_get_log_level();
bool mtc_res = false;
int mtc_argc = 1;
char mtc_arg_data[CHAINLOADER_ARG_DATA_MAX_SIZE] = {0};
stage2_mtc_args_t *mtc_args = (stage2_mtc_args_t *)mtc_arg_data;
/* Setup argument data. */
memcpy(&mtc_args->log_level, &mtc_log_level, sizeof(mtc_log_level));
/* Run the MTC binary. */
mtc_res = (((int (*)(int, void *))mtc_address)(mtc_argc, mtc_arg_data) == 0);
/* Cleanup right away. */
memset((void *)mtc_address, 0, size);
return mtc_res;
}
void load_stage2(const char *bct0) {
stage2_config_t config = {0};
FILINFO info;
@@ -123,11 +87,6 @@ void load_stage2(const char *bct0) {
print(SCREEN_LOG_LEVEL_DEBUG | SCREEN_LOG_LEVEL_NO_PREFIX, " Load Address: 0x%08x\n", config.load_address);
print(SCREEN_LOG_LEVEL_DEBUG | SCREEN_LOG_LEVEL_NO_PREFIX, " Entrypoint: 0x%p\n", config.entrypoint);
/* Run the MTC binary. */
if (!run_mtc(config.mtc_path, config.load_address)) {
print(SCREEN_LOG_LEVEL_WARNING, "DRAM training failed! Continuing with untrained DRAM.\n");
}
if (f_stat(config.path, &info) != FR_OK) {
fatal_error("Failed to stat stage2 (%s)!\n", config.path);
}