linux-kernel - RE: [EXT] [PATCH v1 1/2] scsi: ufs: Introduce a vops for resetting host controller

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Message-ID: <BN7PR08MB568444BD52F49775D7EEB363DB6B0@BN7PR08MB5684.namprd08.prod.outlook.com>
Date:   Wed, 23 Oct 2019 10:39:33 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        "salyzyn@...gle.com" <salyzyn@...gle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH v1 1/2] scsi: ufs: Introduce a vops for resetting
 host controller

Hi, Can Guo
Actually, we already have DME_RESET,  this is not enough for Qualcomm host? 
Thanks,

//Bean

> 
> Some UFS host controllers need their specific implementations of resetting to
> get them into a good state. Provide a new vops to allow the platform driver to
> implement this own reset operation.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 16 ++++++++++++++++  drivers/scsi/ufs/ufshcd.h | 10
> ++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
> c28c144..161e3c4 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3859,6 +3859,14 @@ static int ufshcd_link_recovery(struct ufs_hba *hba)
>  	ufshcd_set_eh_in_progress(hba);
>  	spin_unlock_irqrestore(hba->host->host_lock, flags);
> 
> +	ret = ufshcd_vops_full_reset(hba);
> +	if (ret)
> +		dev_warn(hba->dev, "%s: full reset returned %d\n",
> +				  __func__, ret);
> +
> +	/* Reset the attached device */
> +	ufshcd_vops_device_reset(hba);
> +
>  	ret = ufshcd_host_reset_and_restore(hba);
> 
>  	spin_lock_irqsave(hba->host->host_lock, flags); @@ -6241,6 +6249,11
> @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba)
>  	int retries = MAX_HOST_RESET_RETRIES;
> 
>  	do {
> +		err = ufshcd_vops_full_reset(hba);
> +		if (err)
> +			dev_warn(hba->dev, "%s: full reset returned %d\n",
> +					__func__, err);
> +
>  		/* Reset the attached device */
>  		ufshcd_vops_device_reset(hba);
> 
> @@ -8384,6 +8397,9 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem
> *mmio_base, unsigned int irq)
>  		goto exit_gating;
>  	}
> 
> +	/* Reset controller to power on reset (POR) state */
> +	ufshcd_vops_full_reset(hba);
> +
>  	/* Reset the attached device */
>  	ufshcd_vops_device_reset(hba);
> 
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index
> e0fe247..253b9ea 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -296,6 +296,8 @@ struct ufs_pwr_mode_info {
>   * @apply_dev_quirks: called to apply device specific quirks
>   * @suspend: called during host controller PM callback
>   * @resume: called during host controller PM callback
> + * @full_reset: called for handling variant specific implementations of
> + *              resetting the hci
>   * @dbg_register_dump: used to dump controller debug information
>   * @phy_initialization: used to initialize phys
>   * @device_reset: called to issue a reset pulse on the UFS device @@ -325,6
> +327,7 @@ struct ufs_hba_variant_ops {
>  	int	(*apply_dev_quirks)(struct ufs_hba *);
>  	int     (*suspend)(struct ufs_hba *, enum ufs_pm_op);
>  	int     (*resume)(struct ufs_hba *, enum ufs_pm_op);
> +	int	(*full_reset)(struct ufs_hba *hba);
>  	void	(*dbg_register_dump)(struct ufs_hba *hba);
>  	int	(*phy_initialization)(struct ufs_hba *);
>  	void	(*device_reset)(struct ufs_hba *hba);
> @@ -1076,6 +1079,13 @@ static inline int ufshcd_vops_resume(struct ufs_hba
> *hba, enum ufs_pm_op op)
>  	return 0;
>  }
> 
> +static inline int ufshcd_vops_full_reset(struct ufs_hba *hba) {
> +	if (hba->vops && hba->vops->full_reset)
> +		return hba->vops->full_reset(hba);
> +	return 0;
> +}
> +
>  static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba)  {
>  	if (hba->vops && hba->vops->dbg_register_dump)
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project