linux-kernel - RE: [PATCH v6 3/4] misc: rtsx: Cleanup power management ops

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Date:   Tue, 25 Jan 2022 06:38:39 +0000
From:   Ricky WU <ricky_wu@...ltek.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>
CC:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6 3/4] misc: rtsx: Cleanup power management ops



> -----Original Message-----
> From: Kai-Heng Feng <kai.heng.feng@...onical.com>
> Sent: Tuesday, January 25, 2022 1:50 PM
> To: arnd@...db.de; gregkh@...uxfoundation.org; ulf.hansson@...aro.org
> Cc: linux-pm@...r.kernel.org; Kai-Heng Feng <kai.heng.feng@...onical.com>;
> Ricky WU <ricky_wu@...ltek.com>; Christophe JAILLET
> <christophe.jaillet@...adoo.fr>; Yang Li <yang.lee@...ux.alibaba.com>;
> linux-kernel@...r.kernel.org
> Subject: [PATCH v6 3/4] misc: rtsx: Cleanup power management ops
> 
> - Use cancel_delayed_work_sync to ensure there's no race with
>   carddet_work.
> 
> - Remove device_wakeup_disable to save some CPU cycles. If the device
>   really has ACPI _DSW then the wakeup should be disabled in probe
>   routine.
> 
> - Remove fetch_vendor_settings from runtime resume routine, since they
>   are already saved in "struct rtsx_pcr".
> 
> - Move variable assignments to the top of the functions.
> 
> Cc: Ricky WU <ricky_wu@...ltek.com>
Tested-by: Ricky WU <ricky_wu@...ltek.com>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
> v6:
> v5:
>  - No change.
> 
> v4:
>  - Move variable assignments to the top of the functions.
> 
> v3:
> v2:
>  - No change.
> 
>  drivers/misc/cardreader/rtsx_pcr.c | 34 ++++++++----------------------
>  1 file changed, 9 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/misc/cardreader/rtsx_pcr.c
> b/drivers/misc/cardreader/rtsx_pcr.c
> index 8aba47a7d9736..3c97d3b50456e 100644
> --- a/drivers/misc/cardreader/rtsx_pcr.c
> +++ b/drivers/misc/cardreader/rtsx_pcr.c
> @@ -1660,22 +1660,17 @@ static void rtsx_pci_remove(struct pci_dev
> *pcidev)  static int __maybe_unused rtsx_pci_suspend(struct device *dev_d)
> {
>  	struct pci_dev *pcidev = to_pci_dev(dev_d);
> -	struct pcr_handle *handle;
> -	struct rtsx_pcr *pcr;
> +	struct pcr_handle *handle = pci_get_drvdata(pcidev);
> +	struct rtsx_pcr *pcr = handle->pcr;
> 
>  	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
> 
> -	handle = pci_get_drvdata(pcidev);
> -	pcr = handle->pcr;
> -
> -	cancel_delayed_work(&pcr->carddet_work);
> +	cancel_delayed_work_sync(&pcr->carddet_work);
> 
>  	mutex_lock(&pcr->pcr_mutex);
> 
>  	rtsx_pci_power_off(pcr, HOST_ENTER_S3);
> 
> -	device_wakeup_disable(dev_d);
> -
>  	mutex_unlock(&pcr->pcr_mutex);
>  	return 0;
>  }
> @@ -1683,15 +1678,12 @@ static int __maybe_unused
> rtsx_pci_suspend(struct device *dev_d)  static int __maybe_unused
> rtsx_pci_resume(struct device *dev_d)  {
>  	struct pci_dev *pcidev = to_pci_dev(dev_d);
> -	struct pcr_handle *handle;
> -	struct rtsx_pcr *pcr;
> +	struct pcr_handle *handle = pci_get_drvdata(pcidev);
> +	struct rtsx_pcr *pcr = handle->pcr;
>  	int ret = 0;
> 
>  	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
> 
> -	handle = pci_get_drvdata(pcidev);
> -	pcr = handle->pcr;
> -
>  	mutex_lock(&pcr->pcr_mutex);
> 
>  	ret = rtsx_pci_write_register(pcr, HOST_SLEEP_STATE, 0x03, 0x00); @@
> -1711,13 +1703,11 @@ static int __maybe_unused rtsx_pci_resume(struct
> device *dev_d)
> 
>  static void rtsx_pci_shutdown(struct pci_dev *pcidev)  {
> -	struct pcr_handle *handle;
> -	struct rtsx_pcr *pcr;
> +	struct pcr_handle *handle = pci_get_drvdata(pcidev);
> +	struct rtsx_pcr *pcr = handle->pcr;
> 
>  	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
> 
> -	handle = pci_get_drvdata(pcidev);
> -	pcr = handle->pcr;
>  	rtsx_pci_power_off(pcr, HOST_ENTER_S1);
> 
>  	pci_disable_device(pcidev);
> @@ -1756,11 +1746,8 @@ static int rtsx_pci_runtime_idle(struct device
> *device)  static int rtsx_pci_runtime_suspend(struct device *device)  {
>  	struct pci_dev *pcidev = to_pci_dev(device);
> -	struct pcr_handle *handle;
> -	struct rtsx_pcr *pcr;
> -
> -	handle = pci_get_drvdata(pcidev);
> -	pcr = handle->pcr;
> +	struct pcr_handle *handle = pci_get_drvdata(pcidev);
> +	struct rtsx_pcr *pcr = handle->pcr;
> 
>  	dev_dbg(device, "--> %s\n", __func__);
> 
> @@ -1786,9 +1773,6 @@ static int rtsx_pci_runtime_resume(struct device
> *device)
> 
>  	rtsx_pci_write_register(pcr, HOST_SLEEP_STATE, 0x03, 0x00);
> 
> -	if (pcr->ops->fetch_vendor_settings)
> -		pcr->ops->fetch_vendor_settings(pcr);
> -
>  	rtsx_pci_init_hw(pcr);
> 
>  	if (pcr->slots[RTSX_SD_CARD].p_dev != NULL) {
> --
> 2.33.1