Subject: [PATCH v2 01/13] ARM: OMAP2+: CM: reintroduce SW_SLEEP for OMAP4

From: [email-masked] (Rajendra Nayak)
Date: Wed, 21 Aug 2013 12:43:16 +0530

On Friday 02 August 2013 07:06 PM, Afzal Mohammed wrote:
> From: Vaibhav Bedia <[email-masked]>
> 
> "65aa94b ARM: OMAP4: clockdomain/CM code: Update supported transition modes"
> removed SW_SLEEP mode for clockdomains on OMAP4 class of devices. Not
> having SW_SLEEP mode works fine for OMAP4/5 devices but it gets in the
> way of reuse for other devices like AM43x which have the same hardware
> but where most of clockdomains support only SW_SLEEP/SW_WKUP modes.
> 
> This also can help make AM335x (which has custom functions) reuse
> OMAP4 PRM/CM functions.
> 
> While here also fixup a trivial typo in the comment.
> 
> [afzal at ti.com: Alter message to refer to AM43x instead of AM335x, this
>  was pulled in from series that reuses OMAP4 PRM/CM for AM335x, which
>  as of now is not being followed upon]
> Signed-off-by: Vaibhav Bedia <[email-masked]>
> Signed-off-by: Afzal Mohammed <[email-masked]>
> ---
>  arch/arm/mach-omap2/cminst44xx.c |   20 +++++++++++++++++---
>  1 file changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/cminst44xx.c b/arch/arm/mach-omap2/cminst44xx.c
> index f0290f5..35051fd 100644
> --- a/arch/arm/mach-omap2/cminst44xx.c
> +++ b/arch/arm/mach-omap2/cminst44xx.c
> @@ -237,7 +237,7 @@ void omap4_cminst_clkdm_disable_hwsup(u8 part, s16 inst, u16 cdoffs)
>  }
>  
>  /**
> - * omap4_cminst_clkdm_force_sleep - try to take a clockdomain out of idle
> + * omap4_cminst_clkdm_force_wakeup - try to take a clockdomain out of idle
>   * @part: PRCM partition ID that the clockdomain registers exist in
>   * @inst: CM instance register offset (*_INST macro)
>   * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
> @@ -250,6 +250,20 @@ void omap4_cminst_clkdm_force_wakeup(u8 part, s16 inst, u16 cdoffs)
>  	_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_WAKEUP, part, inst, cdoffs);
>  }
>  
> +/**
> + * omap4_cminst_clkdm_force_sleep - try to put a clockdomain to idle
> + * @part: PRCM partition ID that the clockdomain registers exist in
> + * @inst: CM instance register offset (*_INST macro)
> + * @cdoffs: Clockdomain register offset (*_CDOFFS macro)
> + *
> + * Put a clockdomain referred to by (@part, @inst, @cdoffs) to idle,
> + * forcing it to sleep.  No return value.
> + */
> +void omap4_cminst_clkdm_force_sleep(u8 part, s16 inst, u16 cdoffs)
> +{
> +	_clktrctrl_write(OMAP34XX_CLKSTCTRL_FORCE_SLEEP, part, inst, cdoffs);

I guess this won't work on omap4/5 where some clockdomains do not support
SW_SLEEP and only support HW_AUTO. We might need to have different clkdm
operations for the different omap4 variants.

> +}
> +
>  /*
>   *
>   */
> @@ -404,8 +418,8 @@ static int omap4_clkdm_clear_all_wkup_sleep_deps(struct clockdomain *clkdm)
>  
>  static int omap4_clkdm_sleep(struct clockdomain *clkdm)
>  {
> -	omap4_cminst_clkdm_enable_hwsup(clkdm->prcm_partition,
> -					clkdm->cm_inst, clkdm->clkdm_offs);
> +	omap4_cminst_clkdm_force_sleep(clkdm->prcm_partition,
> +				       clkdm->cm_inst, clkdm->clkdm_offs);
>  	return 0;
>  }
>  
>