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).
Thanks,
Johan
