linux-kernel - Re: [PATCH v2] soc: mediatek: add scpsys support active

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Date:	Wed, 26 Aug 2015 05:11:47 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Eddie Huang <eddie.huang@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-mediatek@...ts.infradead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v2] soc: mediatek: add scpsys support active_wakeup

Hi Eddie,

On Tue, Aug 25, 2015 at 2:00 PM, Eddie Huang <eddie.huang@...iatek.com> wrote:
> Register gpd_dev_ops.active_wakeup function to support keep power
> during suspend state. And add flag to each power domain to
> decide whether keep power during suspend or not.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
> Acked-by: Sascha Hauer <s.hauer@...gutronix.de>
>
> ---
> Change in v2:
> Drop .active_wakeup = false lines in scp_domain_data[] array
>
> ---
>  drivers/soc/mediatek/mtk-scpsys.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
> index 43a79ed..df2f288 100644
> --- a/drivers/soc/mediatek/mtk-scpsys.c
> +++ b/drivers/soc/mediatek/mtk-scpsys.c
> @@ -67,6 +67,7 @@ struct scp_domain_data {
>         u32 sram_pdn_ack_bits;
>         u32 bus_prot_mask;
>         enum clk_id clk_id;
> +       bool active_wakeup;
>  };
>
>  static const struct scp_domain_data scp_domain_data[] __initconst = {
> @@ -127,6 +128,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = {
>                 .sram_pdn_bits = GENMASK(11, 8),
>                 .sram_pdn_ack_bits = GENMASK(15, 12),
>                 .clk_id = MT8173_CLK_NONE,
> +               .active_wakeup = true,
>         },
>         [MT8173_POWER_DOMAIN_MFG_ASYNC] = {
>                 .name = "mfg_async",
> @@ -171,6 +173,7 @@ struct scp_domain {
>         u32 sram_pdn_bits;
>         u32 sram_pdn_ack_bits;
>         u32 bus_prot_mask;
> +       bool active_wakeup;
>  };
>
>  struct scp {
> @@ -370,6 +373,20 @@ out:
>         return ret;
>  }
>
> +static bool scpsys_active_wakeup(struct device *dev)
> +{
> +       struct generic_pm_domain *genpd;
> +       struct scp_domain *scpd;
> +
> +       if (IS_ERR_OR_NULL(dev->pm_domain))
> +               return false;

Is it really possible to get here w/ pm_domain as an ERR or NULL?
If the power core can ensure this cannot happen, then this function
could be a bit simpler.

Other than that, this patch is:
Reviewed-by: Daniel Kurtz <djkurtz@...omium.org>

-Dan

> +
> +       genpd = pd_to_genpd(dev->pm_domain);
> +       scpd = container_of(genpd, struct scp_domain, genpd);
> +
> +       return scpd->active_wakeup;
> +}
--
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