From 9178ba294b6839eeff1a91bed95515d783f3ee6c Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Mon, 13 Oct 2014 16:01:09 +0200 Subject: 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 [mpe: Squash into one patch and update changelog based on cover letter] Signed-off-by: Michael Ellerman --- arch/powerpc/sysdev/fsl_soc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/powerpc/sysdev/fsl_soc.c') diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c index ffd1169ebaab..1e04568da3b9 100644 --- a/arch/powerpc/sysdev/fsl_soc.c +++ b/arch/powerpc/sysdev/fsl_soc.c @@ -238,7 +238,7 @@ void fsl_hv_restart(char *cmd) /* * Halt the current partition * - * This function should be assigned to the ppc_md.power_off and ppc_md.halt + * This function should be assigned to the pm_power_off and ppc_md.halt * function pointers, to shut down the partition when we're running under * the Freescale hypervisor. */ -- cgit v1.2.3