netdev - Re: [PATCH net-next v6 12/13] net: wwan: t7xx: Device deep sleep lock/unlock

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Date:   Thu, 21 Apr 2022 14:47:06 +0300 (EEST)
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 v6 12/13] net: wwan: t7xx: Device deep sleep
 lock/unlock

On Thu, 7 Apr 2022, Ricardo Martinez wrote:

> From: Haijun Liu <haijun.liu@...iatek.com>
> 
> Introduce the mechanism to lock/unlock the device 'deep sleep' mode.
> When the PCIe link state is L1.2 or L2, the host side still can keep
> the device is in D0 state from the host side point of view. At the same
> time, if the device's 'deep sleep' mode is unlocked, the device will
> go to 'deep sleep' while it is still in D0 state on the host side.
> 
> 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>
> ---

> +void t7xx_pci_enable_sleep(struct t7xx_pci_dev *t7xx_dev)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&t7xx_dev->md_pm_lock, flags);
> +	t7xx_dev->sleep_disable_count--;
> +	if (atomic_read(&t7xx_dev->md_pm_state) < MTK_PM_RESUMED) {

goto unlock;

> +		spin_unlock_irqrestore(&t7xx_dev->md_pm_lock, flags);
> +		return;
> +	}
> +
> +	if (t7xx_dev->sleep_disable_count == 0)
> +		t7xx_dev_set_sleep_capability(t7xx_dev, true);

unlock:

> +	spin_unlock_irqrestore(&t7xx_dev->md_pm_lock, flags);
> +}
> +
>  static int t7xx_send_pm_request(struct t7xx_pci_dev *t7xx_dev, u32 request)
>  {
>  	unsigned long wait_ret;

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>


-- 
 i.