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

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Date:   Tue, 29 Oct 2019 10:11:05 +0800
From:   cang@...eaurora.org
To:     "Bean Huo (beanhuo)" <beanhuo@...ron.com>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
        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

On 2019-10-23 18:39, Bean Huo (beanhuo) wrote:
> Hi, Can Guo
> Actually, we already have DME_RESET,  this is not enough for Qualcomm 
> host?
> Thanks,
> 
> //Bean
> 

Hi Bean,

Yes, for Qualcomm hosts, we need this to fully reset the whole UFS 
controller block

Can Guo

>> 
>> 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