svn commit: r323471 - stable/11/sys/arm/broadcom/bcm2835
Ian Lepore
ian at FreeBSD.org
Mon Sep 11 22:35:21 UTC 2017
Author: ian
Date: Mon Sep 11 22:35:20 2017
New Revision: 323471
URL: https://svnweb.freebsd.org/changeset/base/323471
Log:
MFC r323132-r323133
r323132:
The latest RPi firmware leaves secondary cores in a wait-for-event (WFE)
state to save power, so after writing the entry point address for a core to
the mailbox, use a dsb() to synchronize the execution pipeline to the data
written, then use an sev() to wake up the core.
Submitted by: Sylvain Garrigues <sylgar at gmail.com>
r323133:
Change leading spaces to tabs, no functional change.
Modified:
stable/11/sys/arm/broadcom/bcm2835/bcm2836_mp.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/arm/broadcom/bcm2835/bcm2836_mp.c
==============================================================================
--- stable/11/sys/arm/broadcom/bcm2835/bcm2836_mp.c Mon Sep 11 22:33:29 2017 (r323470)
+++ stable/11/sys/arm/broadcom/bcm2835/bcm2836_mp.c Mon Sep 11 22:35:20 2017 (r323471)
@@ -114,7 +114,9 @@ platform_mp_start_ap(void)
/* set entry point to mailbox 3 */
BSWR4(MBOX3SET_CORE(i),
(uint32_t)pmap_kextract((vm_offset_t)mpentry));
- wmb();
+ /* Firmware put cores in WFE state, need SEV to wake up. */
+ dsb();
+ sev();
/* wait for bootup */
retry = 1000;
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