linux-kernel - Re: [PATCH v2] soc: xilinx: Set CAP_UNUSABLE requirement for versal while powering down domain

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Date:   Thu, 26 Sep 2019 12:09:50 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Jolly Shah <jolly.shah@...inx.com>, matthias.bgg@...il.com,
        andy.gross@...aro.org, shawnguo@...nel.org,
        geert+renesas@...der.be, bjorn.andersson@...aro.org,
        sean.wang@...iatek.com, m.szyprowski@...sung.com,
        michal.simek@...inx.com
Cc:     rajanv@...inx.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Tejas Patel <tejas.patel@...inx.com>
Subject: Re: [PATCH v2] soc: xilinx: Set CAP_UNUSABLE requirement for versal
 while powering down domain

On 26. 08. 19 22:30, Jolly Shah wrote:
> From: Tejas Patel <tejas.patel@...inx.com>
> 
> For "0" requirement which is used to inform firmware that device is
> not required currently by master, Versal PLM (Platform Loader and
> Manager) which runs on Platform Management Controller and is responsible
> platform management of devices that disables clock, power it down
> and reset the device. genpd_power_off() is being called during runtime
> suspend also. So, if any device goes to runtime suspend state during
> resumes it needs to be re-initialized again. It is possible that
> drivers do not reinitialize device upon resume from runtime suspend
> every time ans so dont want it to be powered down or get reset
> during runtime suspend.
> 
> In Versal PLM new PM_CAP_UNUSABLE capability is added, which disables
> clock only and avoids power down and reset during runtime suspend. Power
> and reset will be gated with core suspend.So, this patch sets 
> CAPABILITY_UNUSABLE requirement during gpd_power_off()
> if platform is other than zynqmp.
> 
> Signed-off-by: Tejas Patel <tejas.patel@...inx.com>
> Signed-off-by: Jolly Shah <jolly.shah@...inx.com>
> ---

Where is the version log?

>  drivers/soc/xilinx/zynqmp_pm_domains.c | 10 ++++++++--
>  include/linux/firmware/xlnx-zynqmp.h   |  3 ++-
>  2 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/soc/xilinx/zynqmp_pm_domains.c b/drivers/soc/xilinx/zynqmp_pm_domains.c
> index 600f57c..23d90cb 100644
> --- a/drivers/soc/xilinx/zynqmp_pm_domains.c
> +++ b/drivers/soc/xilinx/zynqmp_pm_domains.c
> @@ -2,7 +2,7 @@
>  /*
>   * ZynqMP Generic PM domain support
>   *
> - *  Copyright (C) 2015-2018 Xilinx, Inc.
> + *  Copyright (C) 2015-2019 Xilinx, Inc.
>   *
>   *  Davorin Mista <davorin.mista@...ios.com>
>   *  Jolly Shah <jollys@...inx.com>
> @@ -25,6 +25,8 @@
>  
>  static const struct zynqmp_eemi_ops *eemi_ops;
>  
> +static int min_capability;
> +
>  /**
>   * struct zynqmp_pm_domain - Wrapper around struct generic_pm_domain
>   * @gpd:		Generic power domain
> @@ -106,7 +108,7 @@ static int zynqmp_gpd_power_off(struct generic_pm_domain *domain)
>  	int ret;
>  	struct pm_domain_data *pdd, *tmp;
>  	struct zynqmp_pm_domain *pd;
> -	u32 capabilities = 0;
> +	u32 capabilities = min_capability;
>  	bool may_wakeup;
>  
>  	if (!eemi_ops->set_requirement)
> @@ -283,6 +285,10 @@ static int zynqmp_gpd_probe(struct platform_device *pdev)
>  	if (!domains)
>  		return -ENOMEM;
>  
> +	if (!of_device_is_compatible(dev->parent->of_node,
> +				     "xlnx,zynqmp-firmware"))
> +		min_capability = ZYNQMP_PM_CAPABILITY_UNUSABLE;

I have not a problem with this patch but versal firmware is not wired in
firmware yet that's why this code shouldn't be called at all.

Can you please wire it?

Thanks,
Michal