On Wed, Aug 22, 2018 at 09:34:09AM +0200, Johan Hovold wrote:
> On Wed, Aug 22, 2018 at 11:02:31AM +0530, Keerthy wrote:
> > Enable DS0 for only those platforms on which it is functional
> >
> > Signed-off-by: Keerthy <j-keerthy@xxxxxx>
> > ---
> > arch/arm/mach-omap2/pm33xx-core.c | 5 +++++
> > drivers/soc/ti/pm33xx.c | 9 +++++++++
> > include/linux/platform_data/pm33xx.h | 2 ++
> > 3 files changed, 16 insertions(+)
> >
> > diff --git a/arch/arm/mach-omap2/pm33xx-core.c b/arch/arm/mach-omap2/pm33xx-core.c
> > index f4971e4..f0f6e8e 100644
> > --- a/arch/arm/mach-omap2/pm33xx-core.c
> > +++ b/arch/arm/mach-omap2/pm33xx-core.c
> > @@ -135,6 +135,11 @@ static int am43xx_suspend(unsigned int state, int (*fn)(unsigned long),
> > {
> > int ret = 0;
> >
> > + if (!(args & WFI_FLAG_DEEP_SLEEP0)) {
> > + pr_err("DS0 mode not supported\n");
> > + return -ENOTSUPP;
> > + }
> > +
> > amx3_pre_suspend_common();
> > scu_power_mode(scu_base, SCU_PM_POWEROFF);
> > ret = cpu_suspend(args, fn);
> > diff --git a/drivers/soc/ti/pm33xx.c b/drivers/soc/ti/pm33xx.c
> > index d0dab32..53238d7 100644
> > --- a/drivers/soc/ti/pm33xx.c
> > +++ b/drivers/soc/ti/pm33xx.c
> > @@ -324,6 +324,15 @@ static int am33xx_pm_probe(struct platform_device *pdev)
> > suspend_wfi_flags |= WFI_FLAG_SAVE_EMIF;
> > suspend_wfi_flags |= WFI_FLAG_WAKE_M3;
> >
> > + /*
> > + * Deep Sleep0 mode is currently functional only on am437x-gp-evm,
> > + * am33xx-evm and boneblack family. Hence set the DS0 flag
> > + */
> > + if (of_machine_is_compatible("ti,am437x-gp-evm") ||
> > + of_machine_is_compatible("ti,am335x-bone-black") ||
> > + of_machine_is_compatible("ti,am335x-evm"))
> > + suspend_wfi_flags |= WFI_FLAG_DEEP_SLEEP0;
>
> What about other (out-of-tree) machines which supports DS0 and which
> this change would break?
>
> I think this needs to be a blacklist if anything.
>
> Please also expand in the commit message why you think this is needed.
>
> Last, what tree is this against? There's no am43xx_suspend() in
> linux-next (and you add compatibles above for am33xx too).
Sorry, there is indeed an am43xx_suspend(), but you are adding
compatibles for am33xx which use am33xx_suspend().
Johan
