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Commit 194fe6f2 authored by Sudeep Holla's avatar Sudeep Holla Committed by Daniel Lezcano
Browse files

drivers: cpuidle: Don't initialize big.LITTLE driver if MCPM is unavailable 



If big.LITTLE driver is initialized even when MCPM is unavailable,
we get the below warning the first time cpu tries to enter deeper
C-states.

------------[ cut here ]------------
WARNING: CPU: 4 PID: 0 at kernel/arch/arm/common/mcpm_entry.c:130 mcpm_cpu_suspend+0x6d/0x74()
Modules linked in:
CPU: 4 PID: 0 Comm: swapper/4 Not tainted 3.19.0-rc3-00007-gaf5a2cb1ad5c-dirty #11
Hardware name: ARM-Versatile Express
[<c0013fa5>] (unwind_backtrace) from [<c001084d>] (show_stack+0x11/0x14)
[<c001084d>] (show_stack) from [<c04fe7f1>] (dump_stack+0x6d/0x78)
[<c04fe7f1>] (dump_stack) from [<c0020645>] (warn_slowpath_common+0x69/0x90)
[<c0020645>] (warn_slowpath_common) from [<c00206db>] (warn_slowpath_null+0x17/0x1c)
[<c00206db>] (warn_slowpath_null) from [<c001cbdd>] (mcpm_cpu_suspend+0x6d/0x74)
[<c001cbdd>] (mcpm_cpu_suspend) from [<c03c6919>] (bl_powerdown_finisher+0x21/0x24)
[<c03c6919>] (bl_powerdown_finisher) from [<c001218d>] (cpu_suspend_abort+0x1/0x14)
[<c001218d>] (cpu_suspend_abort) from [<00000000>] (  (null))
---[ end trace d098e3fd00000008 ]---

This patch fixes the issue by checking for the availability of MCPM
before initializing the big.LITTLE cpuidle driver

Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Acked-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent ec6f34e5

drivers/cpuidle/cpuidle-big_little.c

+4 −0
Original line number Diff line number Diff line
@@ -182,6 +182,10 @@ static int __init bl_idle_init(void) 
	 */

	if (!of_match_node(compatible_machine_match, root))

		return -ENODEV;



	if (!mcpm_is_available())

		return -EUNATCH;



	/*

	 * For now the differentiation between little and big cores

	 * is based on the part number. A7 cores are considered little