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authorNicolas Pitre <nicolas.pitre@linaro.org>2014-04-22 03:25:35 +0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-04-23 01:23:59 +0400
commit4530e4b6a450af14973c2b0703edfb02d66cbd41 (patch)
tree20ad0784be6feed9e2869a0961e468d82bfe333c /arch/arm/include/asm/mcpm.h
parent56b700fd6f1e49149880fb1b6ffee0dca5be45fb (diff)
downloadlinux-4530e4b6a450af14973c2b0703edfb02d66cbd41.tar.xz
ARM: 8032/1: bL_switcher: fix validation check before its activation
The switcher should not depend on MAX_CLUSTER to determine ifit should be activated or not. In a multiplatform kernel binary it is possible to have dual-cluster and quad-cluster platforms configured in. In that case MAX_CLUSTER which is a build time limit should be 4 and that shouldn't prevent the switcher from working if the kernel is booted on a b.L dual-cluster system. In bL_switcher_halve_cpus() we already have a runtime validation check to make sure we're dealing with only two clusters, so booting on a quad cluster system will be caught and switcher activation aborted. However, the b.L switcher must ensure the MCPM layer is initialized on the booted hardware before doing anything. The mcpm_is_available() function is added to that effect. Signed-off-by: Nicolas Pitre <nico@linaro.org> Tested-by: Abhilash Kesavan <kesavan.abhilash@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/mcpm.h')
-rw-r--r--arch/arm/include/asm/mcpm.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm/include/asm/mcpm.h b/arch/arm/include/asm/mcpm.h
index 608516ebabfe..a5ff410dcdb6 100644
--- a/arch/arm/include/asm/mcpm.h
+++ b/arch/arm/include/asm/mcpm.h
@@ -54,6 +54,13 @@ void mcpm_set_early_poke(unsigned cpu, unsigned cluster,
*/
/**
+ * mcpm_is_available - returns whether MCPM is initialized and available
+ *
+ * This returns true or false accordingly.
+ */
+bool mcpm_is_available(void);
+
+/**
* mcpm_cpu_power_up - make given CPU in given cluster runable
*
* @cpu: CPU number within given cluster