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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> |
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| .. | ||
| asp834x.c | ||
| Kconfig | ||
| km83xx.c | ||
| Makefile | ||
| mcu_mpc8349emitx.c | ||
| misc.c | ||
| mpc83xx.h | ||
| mpc830x_rdb.c | ||
| mpc831x_rdb.c | ||
| mpc832x_mds.c | ||
| mpc832x_rdb.c | ||
| mpc834x_itx.c | ||
| mpc834x_mds.c | ||
| mpc836x_mds.c | ||
| mpc836x_rdk.c | ||
| mpc837x_mds.c | ||
| mpc837x_rdb.c | ||
| sbc834x.c | ||
| suspend-asm.S | ||
| suspend.c | ||
| usb.c | ||