Mirrors/opensbi
4
0
Fork 1
mirror of https://github.com/riscv-software-src/opensbi.git synced 2026-02-27 18:01:45 +00:00
Code Issues Packages Projects Releases Wiki Activity

platform: generic: mips p8700: faster core boot

Browse Source 
When powering up cores, wait for power up to complete
using tight loop. This saves 10ms delay observed for every core

Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260223-for-upstream-eyeq7h-v3-6-621d004d1a21@mobileye.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Vladimir Kondratiev
2026-02-23 16:54:45 +02:00
committed by Anup Patel
parent 6545b78bcd
commit 52ac3de50c
1 changed files with 30 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
platform/generic/mips/p8700.c
View File

@@ -61,10 +61,24 @@ static void power_up_other_cluster(u32 hartid)
sbi_printf("ERROR: Fail to power up cluster %u\n", cl);
}
struct mips_boot_params {
u32 hartid;
bool local_p;
u32 target_state;
};
static bool mips_hart_reached_state(void *arg)
{
struct mips_boot_params *p = arg;
u32 stat = read_cpc_co_stat_conf(p->hartid, p->local_p);
stat = EXT(stat, CPC_Cx_STAT_CONF_SEQ_STATE);
return stat == p->target_state;
}
static int mips_hart_start(u32 hartid, ulong saddr)
{
unsigned int stat;
unsigned int timeout;
bool local_p = (cpu_cluster(current_hartid()) == cpu_cluster(hartid));
/* Hart 0 is the boot hart, and we don't use the CPC cmd to start. */
@@ -75,6 +89,14 @@ static int mips_hart_start(u32 hartid, ulong saddr)
write_gcr_co_reset_base(hartid, (unsigned long)mips_warm_boot, local_p);
if (cpu_hart(hartid) == 0) {
unsigned int const timeout_ms = 10;
bool booted;
struct mips_boot_params p = {
.hartid = hartid,
.local_p = local_p,
.target_state = CPC_Cx_STAT_CONF_SEQ_STATE_U6,
};
/* Ensure its coherency is disabled */
write_gcr_co_coherence(hartid, 0, local_p);
@@ -84,28 +106,13 @@ static int mips_hart_start(u32 hartid, ulong saddr)
/* Reset cluster cl core co hart 0 */
write_cpc_co_cmd(hartid, CPC_Cx_CMD_RESET, local_p);
timeout = 100;
while (true) {
stat = read_cpc_co_stat_conf(hartid, local_p);
stat = EXT(stat, CPC_Cx_STAT_CONF_SEQ_STATE);
if (stat == CPC_Cx_STAT_CONF_SEQ_STATE_U6)
break;
/* Delay a little while before we start warning */
if (timeout) {
sbi_timer_mdelay(10);
timeout--;
}
else {
sbi_printf("Waiting for cluster %u core %u hart %u to start... STAT_CONF=0x%x\n",
cpu_cluster(hartid),
cpu_core(hartid), cpu_hart(hartid),
stat);
break;
}
booted = sbi_timer_waitms_until(mips_hart_reached_state, &p, timeout_ms);
if (!booted) {
sbi_printf("ERROR: failed to boot hart 0x%x in %d ms\n",
hartid, timeout_ms);
return -SBI_ETIMEDOUT;
}
}
else {
} else {
write_cpc_co_vp_run(hartid, 1 << cpu_hart(hartid), local_p);
}