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authorAlexander Graf <agraf@suse.de>2014-10-13 18:01:09 +0400
committerMichael Ellerman <mpe@ellerman.id.au>2014-11-03 04:12:51 +0300
commit9178ba294b6839eeff1a91bed95515d783f3ee6c (patch)
tree61252a8808bba5208c7b7c0f0af31301278272de /arch/powerpc/xmon
parent0df1f2487d2f0d04703f142813d53615d62a1da4 (diff)
downloadlinux-9178ba294b6839eeff1a91bed95515d783f3ee6c.tar.xz
powerpc: Convert power off logic to pm_power_off
The generic Linux framework to power off the machine is a function pointer called pm_power_off. The trick about this pointer is that device drivers can potentially implement it rather than board files. Today on powerpc we set pm_power_off to invoke our generic full machine power off logic which then calls ppc_md.power_off to invoke machine specific power off. However, when we want to add a power off GPIO via the "gpio-poweroff" driver, this card house falls apart. That driver only registers itself if pm_power_off is NULL to ensure it doesn't override board specific logic. However, since we always set pm_power_off to the generic power off logic (which will just not power off the machine if no ppc_md.power_off call is implemented), we can't implement power off via the generic GPIO power off driver. To fix this up, let's get rid of the ppc_md.power_off logic and just always use pm_power_off as was intended. Then individual drivers such as the GPIO power off driver can implement power off logic via that function pointer. With this patch set applied and a few patches on top of QEMU that implement a power off GPIO on the virt e500 machine, I can successfully turn off my virtual machine after halt. Signed-off-by: Alexander Graf <agraf@suse.de> [mpe: Squash into one patch and update changelog based on cover letter] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/xmon')
-rw-r--r--arch/powerpc/xmon/xmon.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index b988b5addf86..506d25681fe3 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -981,7 +981,8 @@ static void bootcmds(void)
else if (cmd == 'h')
ppc_md.halt();
else if (cmd == 'p')
- ppc_md.power_off();
+ if (pm_power_off)
+ pm_power_off();
}
static int cpu_cmd(void)