netdev - Re: [PATCH net-next v5 10/13] net: wwan: t7xx: Introduce power management

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Date:   Tue, 1 Mar 2022 15:26:36 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Ricardo Martinez <ricardo.martinez@...ux.intel.com>
cc:     Netdev <netdev@...r.kernel.org>, linux-wireless@...r.kernel.org,
        kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
        ryazanov.s.a@...il.com, loic.poulain@...aro.org,
        m.chetan.kumar@...el.com, chandrashekar.devegowda@...el.com,
        linuxwwan@...el.com, chiranjeevi.rapolu@...ux.intel.com,
        haijun.liu@...iatek.com, amir.hanania@...el.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        dinesh.sharma@...el.com, eliot.lee@...el.com,
        moises.veleta@...el.com, pierre-louis.bossart@...el.com,
        muralidharan.sethuraman@...el.com, Soumya.Prakash.Mishra@...el.com,
        sreehari.kancharla@...el.com, madhusmita.sahu@...el.com
Subject: Re: [PATCH net-next v5 10/13] net: wwan: t7xx: Introduce power
 management

On Wed, 23 Feb 2022, Ricardo Martinez wrote:

> From: Haijun Liu <haijun.liu@...iatek.com>
> 
> Implements suspend, resumes, freeze, thaw, poweroff, and restore
> `dev_pm_ops` callbacks.
> 
> >From the host point of view, the t7xx driver is one entity. But, the
> device has several modules that need to be addressed in different ways
> during power management (PM) flows.
> The driver uses the term 'PM entities' to refer to the 2 DPMA and
> 2 CLDMA HW blocks that need to be managed during PM flows.
> When a dev_pm_ops function is called, the PM entities list is iterated
> and the matching function is called for each entry in the list.
> 
> Signed-off-by: Haijun Liu <haijun.liu@...iatek.com>
> Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@...el.com>
> Co-developed-by: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
> Signed-off-by: Ricardo Martinez <ricardo.martinez@...ux.intel.com>
> ---

> +static int __t7xx_pci_pm_suspend(struct pci_dev *pdev)
> +{
...
> +	iowrite32(L1_DISABLE_BIT(0), IREG_BASE(t7xx_dev) + DIS_ASPM_LOWPWR_CLR_0);
> +	return 0;

The success path does this same iowrite32 to DIS_ASPM_LOWPWR_CLR_0
as the failure paths. Is that intended?

The function looks much better now!


-- 
 i.